| 著作名稱： | Synergistic Effects of Surface Passivation and Charge Separation to Improve Photoelectrochemical Performance of BiOI Nanoflakes by Au Nanoparticles Decoration. ACS Appl. Mater. Interfaces, 2021, 13, 5721-5730. |
| 年度： | 2021 |
| 類別： |
期刊論文
ACS Appl. Mater. Interfaces
|
| 摘要： | We demonstrate that the photoactivity of bismuth oxyiodide (BiOI) nanoflake (NF) photocathodes in photo-electrochemical (PEC) water splitting can be significantly enhanced by about 24-fold by thermal calcination under an air atmosphere and then surficial decoration of Au nanoparticles (NPs). To understand the key factors affecting the PEC efficiency in Au NP-decorated BiOI NF photoelectrodes, incident photon-to-current conversion efficiency, electrochemical impedance spectroscopy, photovoltage, and electrochemically active surface area measurements were performed. The analytic results presented that thermal calcining could produce mesopores, increasing active sites on the surface of BiOI NFs. In addition, the synergistic effects of surface-state passivation and charge separation were observed for the surficial Au NP decoration on BiOI NFs. Transient absorption spectroscopy coupled with PEC measurements confirmed that the lifetime of photogenerated electrons on the conduction band of BiOI NFs can be prolonged by Au NP decoration, resulting in higher probability to carry out water reduction. The current investigation presents important insights into the mechanism of charge carrier dynamics in metal–semiconductor nano-heterostructures, which is contributive to develop photoelectrode materials in solar fuel production. |
| 關鍵字： | |
| 著作名稱： | Effects of Interfacial Oxidative Layer Removal on Charge Carrier Recombination Dynamics in InP/ZnSexS1–x Core/Shell Quantum Dots |
| 年度： | 2021 |
| 類別： |
期刊論文
J. Phys. Chem. Lett.
|
| 摘要： | ed-light-emitting InP/ZnSexS1–x core/shell quantum dots (QDs) were prepared by one-pot synthesis with optimal hydrogen fluoride (HF) treatment. Most of the surficial oxidative species could be removed, and the dangling bonds would be passivated by Zn ions for the InP cores during HF treatment, which would be beneficial to the subsequent ZnSexS1–x shell coating. Three-dimensional time-resolved photoluminescence spectra of the QD samples were analyzed by singular value decomposition global fitting to determine the radiative and nonradiative lifetimes of charge carriers. A proposed model illustrated that the charge carriers in the InP/ZnSexS1–x QDs with interfacial oxidative layer removal would evidently recombine through radiative pathways, mainly from the conduction band to the valence band (lifetime, 33 ns) and partially from the trap states (lifetime, 150 ns). This work offers the important physical insight into the charge carrier dynamics of low-toxicity QDs which have the desired optical properties for optoelectronic applications. |
| 關鍵字： | Quantum dots, Layers, Carrier dynamics, Electrical conductivity, Recombination |
| 著作名稱： | Aspect ratio dependent charge carrier dynamics in matchstick-like nanorods Ag2S-ZnS nanocrystals for solar hydrogen generation. J. Phys. Chem. Lett. 2020, 11, 2150-2157. [SCI IF: 6.71] |
| 年度： | 2020 |
| 類別： |
期刊論文
J. Phys. Chem. Lett.
|
| 摘要： | Matchstick-like Ag2S-ZnS nanorods (NRs) with a tunable aspect ratio (AR) were synthesized using one-pot thermal decomposition. The ultraviolet photoelectron spectra and time-resolved photoluminescence spectra of the Ag2S-ZnS NRs were collected to study their electronic band structures and charge carrier dynamics. The energy difference (ΔE) at the interface between the ZnS stem and Ag2S tip was altered as the AR of Ag2S-ZnS NRs increased from 11.9 to 18.4, resulting in an enlarged driving force for the delocalized electrons along the conduction band of ZnS being injected into that of Ag2S. The interfacial electron transfer rate constant (ket) from ZnS to Ag2S could be enhanced by ∼2 orders of magnitude from 5.27 × 106 to 3.24 × 108 s–1, leading to a significant improvement in the efficiency of solar hydrogen generation. This investigation provides new physical insights into the manipulation of charge carrier dynamics by means of AR adjustment in semiconductor nanoheterostructures for photoelectric conversions. |
| 關鍵字： | |
| 著作名稱： | Mechanisms behind photocatalytic CO2 reduction by CsPbBr3 perovskite-graphene-based nanoheterostructures. Appl. Catal. B: Environmental, 2021, 284, 119751. [SCI IF: 16.683] |
| 年度： | 2020 |
| 類別： |
期刊論文
Applied Catalysis B: Environmental
|
| 摘要： | We demonstrate the CsPbBr3 nanoparticles can in-situ growth on semiconducting graphene oxide (GO) and conductive few-layer graphene (FLG) surfaces, individually. The type-II and Schottky-junction-like energy band structures of CsPbBr3-GO and CsPbBr3-FLG nanoheterostructures (NHSs) resulted in the varied interfacial charge transfer (CT) behaviors. The CT rate constant (kCT) of CsPbBr3-GO and CsPbBr3-FLG NHSs could be modulated by controlling their constituent ratio of GO/FLG. Moreover, the CO2−to−CH4 conversion rate () of CsPbBr3-GO NHSs showed a positive relation with kCT, while the negative correlation between and kCT for CsPbBr3-FLG NHSs was observed. The mechanism can be suggested as that the different energy band structures in CsPbBr3-graphehe-based NHSs provide the varied reduction potential for the photoexcited charge carriers to effect the performance in photocatalytic CO2 reduction. This work presents the important insights into the design of perovskite-graphene based NHS with remarkable performance for solar-driven CO2 conversion. |
| 關鍵字： | |
| 著作名稱： | New Insights into the Electron-Collection Efficiency Improvement of CdS-Sensitized TiO2 Nanorod Photoelectrodes by Interfacial Seed- Layer Mediation. ACS Appl. Mater. Interfaces 2019, 11, 8126−8137. [SCI IF: 8.456] |
| 年度： | 2019 |
| 類別： |
期刊論文
ACS Applied Materials & Interfaces
|
| 摘要： | Titanium dioxide (TiO2) nanorods (NR) are widely used as photoanodes in photoelectrochemical (PEC) solar fuel production due to their remarkable photoactivity and stability. In addition, TiO2 NR electrode materials can be decorated with active CdS quantum dots (QDs) to expand the sunlight photon capture. The overall photoelectric conversion efficiency for TiO2 NR or QD sensitized TiO2 NR electrode materials in PEC is typically dominated by their interfacial electron transfer (ET) properties. To understand the key factors affecting the ET, anatase TiO2 seed layer was added into the interface between rutile TiO2 NR and fluorine-doped tin oxide (FTO) substrate. This seed layer enhanced the photocatalytic performance of both the TiO2 NR and CdS QD sensitized TiO2 NR photoanodes in PEC. Time-resolved
photoluminescence (TRPL) spectroscopy and PEC analyses, including Mott-Shottky, electrochemical impedance spectroscopy (EIS) and photovoltage (Vph) measurements, were used to study the charge carrier dynamics at the interfaces between the FTO, TiO2 and CdS QD. Analysis of the results showed that band alignment at the anatase/rutile
junction between the TiO2 and FTO promoted electron collection efficiency (eEC) at the FTO/TiO2 interface and ET rate constant (kET) at the TiO2/CdS QD interface. Furthermore, 34% enhancement of the efficiency in hydrogen (H2) generation demonstrated the potential of the TiO2 seed layer mediated TiO2/CdS QD NRphotoanode in the application of PEC solar fuel production. The current work represents new insights into the mechanism of ET in TiO2 and TiO2/CdS QD NR, which is very useful for the developing of photoelectrode materials in solar energy conversions. |
| 關鍵字： | TiO2, seed mediation, nanorod, photoelectrochemical cell, hydrogen generation |
| 著作名稱： | Enhanced photoreduction of CO2 into methanol by facet-dependent Cu2O/ reduce graphene oxide. Journal of CO₂ Utilization 33 (2019) 171–178. [SCI IF: 5.189] |
| 年度： | 2019 |
| 類別： |
期刊論文
Journal of CO2 Utilizatio
|
| 摘要： | The preparation of cuprous oxide (Cu2O) with different morphologies and oxidation states decorating with
reduced graphene oxide (rGO) and their comparison in the photocatalytic reduction of CO2 are reported in the
present work. The rhombic dodecahedra Cu2O/rGO exhibits the highest methanol yield (355.3 μmol g−1cat)
which is ca. 4.1–80.8 times superior to cubic, octahedral Cu2O/rGO and CuO/rGO after 20 h of visible light
illumination. The enhanced performance may be due to the unique rhombic dodecahedra structure with less
band bending of conduction and valence bands which decrease the energy barrier for the transfer of photogenerated
electrons to the surface. The incorporation of rGO should assist the transfer of photogenerated electrons
from conduction band of Cu2O. The positively charged dodecahedra Cu2O/rGO may also increase the
adsorption of carbonate anions from dissolution of CO2 gas. This work provides a facile solution-chemistry route
to synthesize rGO incorporated crystal Cu2O with various facets as visible-light-active photocatalysts for CO2
utilization by using natural sunlight. |
| 關鍵字： | Cuprous oxide, Crystal facets, Reduced graphene oxide, Renewable energy, CCSU |
| 著作名稱： | Size Dependence of Charge Carrier Dynamic in Organometal Halide Perovskite Nanocrystals: Deciphering the Radiative vs Non-Radiative Components. J. Phys. Chem. C 2019, 123, 7, 4610-4619. [SCI IF: 4.309] |
| 年度： | 2019 |
| 類別： |
期刊論文
The Journal of Physical Chemistry C
|
| 摘要： | n this work, we have synthesized and characterized three differently sized (3.1, 5.7, and 9.3 nm) methylammonium lead bromide (CH3NH3PbBr3) perovskite nanocrystals (PNCs) and passivated using (3-aminopropyl)triethoxysilane and oleic acid as capping ligands. These PNCs show size-dependent absorption and photoluminescence (PL) with the middle-sized PNCs, exhibiting the highest PL quantum yield (∼91%). The effect of size on their exciton/charge carrier dynamics is studied using transient absorption spectroscopy and time-resolved PL. The middle-sized PNCs show slower early time recombination compared to that of the larger and smaller PNCs, suggesting optimized passivation of surface trap states. The observed PL lifetime and QY are analyzed to determine the size dependence of the radiative and nonradiative decay components. The radiative lifetime is found to decrease with decreasing PNC size, which seems to be primarily determined by the PNC core, while the nonradiative lifetime is the longest for the middle-sized PNCs, which is strongly influenced by the presence of band gap states that depend on surface passivation. A kinetic model is proposed to explain the observed dynamics results. This study demonstrates the competing effect between size and surface properties in determining the dynamics and optical properties of PNCs. |
| 關鍵字： | |
| 著作名稱： | Qualitative Effect of the Polymerization Rate on the Nanoparticle Dispersion in Poly(methyl methacrylate)/Silica Nanocomposite Films. Macromolecules 2019, 52, 8312−8322. [SCI IF: 5.997] |
| 年度： | 2019 |
| 類別： |
期刊論文
Macromolecules
|
| 摘要： | In this study, we investigate the effect of the polymerization rate, mainly mediated by the initiator concentration, on the nanoparticle dispersion in the nanocomposite films formed by poly(methyl methacrylate) (PMMA) and [3-(methacryloyloxy)propyl]trimethoxysilane-modified silica nanoparticles (M-SiO2) via free radical polymerization of the precursory solution, that is, 15.5 wt % M-SiO2 nanoparticles dispersed in the methyl methacrylate (MMA) monomer, in which the tethered silanes at the particle surface bearing the reactive vinyl groups were capable of polymerizing with the MMA monomer. At slower polymerization, the nanoparticles self-organized to form a large-length scale network structure with the mass fractal of average dimension of 2.7; contrarily, the nanoparticles exhibited better dispersion when the polymerization proceeded at a faster rate. According to the scenario of perturbed polymerization kinetics in the presence of nanoparticles, we propose a possible mechanism through which the MMA monomers at a lower polymerization rate may constitute longer “multiple grafted PMMA chains” along particle surfaces by an optimal balance between the polymerization of the monomer and the grafting reaction of the monomer onto the particle surface, forming the M-SiO2-rich clusters by interparticle bridging; the multiple grafting reaction also occurred in between any two neighboring M-SiO2 nanoparticles situated respectively at the two adjoining clusters to induce the intercluster bridging, thereby leading to a hierarchical fractal network. However, both the polymerization and the grafting reaction of MMA monomers at a higher polymerization rate formed the shorter free and grafted PMMA chains, providing steric stabilization to retain better dispersity of nanoparticles. |
| 關鍵字： | |
| 著作名稱： | Dependence of Interfacial Charge Transfer on Bifunctional Aromatic Molecular Linkers in CdSe Quantum Dot Sensitized TiO2 Photoelectrodes. ACS Appl. Energy Mater., 2018, 1, 2907-2917 |
| 年度： | 2018 |
| 類別： |
期刊論文
ACS Applied Energy Materials
|
| 摘要： | Quantum dot (QD) sensitization of TiO2 is a powerful method to improve its performance as a photoanode material in solar energy conversion. The efficiency of sensitization depends strongly on the rate of interfacial electron transfer (ET) from the QDs to TiO2. To understand the key factors affecting the ET, arene-substituted (ortho, meta, and para) bifunctional linkers with single or double aromatic rings were employed to link CdSe QDs to TiO2 and control the strength of their interaction as well as the rate of interfacial ET. Interestingly, the para-substituted aromatic linker, 4-mercaptobenzoic acid (4MBA) with the longest distance between the carboxyl and thiol groups, shows the best photoelectrochemical (PEC) performance, when compared to those of ortho-subtituted (2-mercaptobenzoic acid, 2MBA) and meta-substituted (3-mercaptobenzoic acid, 3MBA) aromatic linkers. Two other bifunctional linkers with double aromatic rings, 4′-mercapto-[1,1′-biphenyl]-4-carboxylic acid (4M1B4A) and 6-mercapto-2-naphthioc acid (6M2NA), were also studied for comparison. Ultrafast transient absorption (TA) spectroscopy was used to study the exciton dynamics in CdSe QDs and determine the interfacial ET rate constant (kET). The kET results are consistent with the trend of PEC measurements in that 4MBA shows the highest kET. To gain further insight into the ET mechanism, we performed density functional theory (DFT) calculations to examine the intrinsic properties of the linkers. The results revealed that the favorable wave function distribution of the molecular orbitals of 4MBA and 4M1B4A are responsible for the higher interfacial ET rate and PEC performance due to better interfacial coupling, a factor that dominates over distance. The present study provides important new insight into the mechanism of interfacial ET using aromatic bifunctional linkers, which is useful in designing QD sensitized semiconductor metal oxide nanostructures for applications including photovoltaics and solar fuel generation. |
| 關鍵字： | bifunctional linker; CdSe; density functional theory; electron transfer; PEC; quantum dot; TiO2; transient absorption |
| 著作名稱： | Photophysical Properties and Improved Stability of Organic–Inorganic Perovskite by Surface Passivation. J. Phys. Chem. C, 2018, 122, 15799–15818. [SCI IF: 4.484] |
| 年度： | 2018 |
| 類別： |
期刊論文
The Journal of Physical Chemistry C
|
| 摘要： | Organic–inorganic perovskite materials in the form of nanocrystals and thin films have received enormous attention recently because of their unique optoelectronic properties such as high absorption coefficient, narrow and tunable emission bandwidth, high photoluminescence quantum yield, long exciton lifetime, and balanced charge transport properties. These properties have found applications in a number of important fields, including photovoltaic solar cells, light-emitting diodes, photodetectors, sensors, and lasers. However, the stability of the materials and devices is strongly affected by several factors such as water moisture, light, oxygen, temperature, solvent, and other materials in contact such as metal oxides used in devices. Defects, particularly those related to surface states, play a critical role in the stability as well as the performance of the perovskites. Various surface modification and defect passivation strategies have been developed to enhance stability and improve performance. We review some recent progress in the development of synthetic approaches to produce high-quality nanostructured and bulk film perovskites with controlled properties and functionalities. We also highlight the degradation mechanism and surface passivation approaches to address the issue of instability. To help gain deeper fundamental insight into mechanisms behind degradation and surface passivation, relevant properties, including structural, optical, electronic, and dynamic, are discussed and illustrated with proposed models. |
| 關鍵字： | |
| 著作名稱： | Au–Cd1−xZnxS core–alloyed shell nanocrystals: boosting the interfacial charge dynamics by adjusting the shell composition. J. Mater. Chem. A, 2018, 6, 17503-17513. [SCI IF: 9.931] |
| 年度： | 2018 |
| 類別： |
期刊論文
Journal of Materials Chemistry A
|
| 摘要： | Au–Cd1−xZnxS core–shell nanocrystals (NCs) with controllable shell compositions (from x 0 to x 0.37) were synthesized by using the hot-injection method. By increasing the mole fraction of ZnS in the Cd1−xZnxS shell, the conduction band of Cd1−xZnxS can be cathodically shifted to cause an increase of energy difference between the conduction band level of the Cd1−xZnxS shell and the Fermi level of the Au core, thereby enlarging the driving force of interfacial electron transfer to enhance the photoelectrochemical (PEC) efficiency. The interfacial charge dynamics of the samples were examined by time-resolved photoluminescence (TRPL) spectroscopy. The results showed that the interfacial electron transfer rate constant (ket) from the Cd1−xZnxS shell to the Au core was increased by 2 orders of magnitude, from 2.41 × 107 to 4.91 × 109 s−1 as the mole fraction of ZnS increased from 0 to 0.37. Furthermore, PEC characterization, including Mott–Schottky analysis and photovoltage decay measurements, illustrated that gradually introducing ZnS into the shell composition of Au–Cd1−xZnxS NCs can modify the band structure and enhance the effectiveness of interfacial ET for advancing the PEC properties. The practical use of Au–Cd1−xZnxS NCs in PEC methanol oxidation was also demonstrated, revealing their promising potential as viable photoelectrodes for various PEC applications. The present study delivers an alternative approach of modulating the interfacial ET dynamics of core–shell MSNs by means of shell composition adjustment. The illustrations provide an empirical guideline to the intelligent design of core–shell metal–semiconductor nanoheterostructures (MSNs) for the desired PEC applications. |
| 關鍵字： | |
| 著作名稱： | Methylamine lead bromide perovskite/protonated graphitic carbon nitride nanocomposites: interfacial charge carrier dynamics and photocatalysis, J. Mater. Chem. A, 2017, 5, 25438–25449. [SCI IF: 9.931] |
| 年度： | 2017 |
| 類別： |
期刊論文
Journal of Materials Chemistry A
|
| 摘要： | We demonstrate the decoration of methylamine lead bromide (MAPbBr3, MA: CH3NH3
+) perovskite
nanoparticles on protonated graphitic carbon nitride (p-g-C3N4) sheets to form nanocomposites (NCs)
for the first time. The intrinsic type II band structure of MAPbBr3/p-g-C3N4 NCs resulted in significant
charge separation properties, which were greatly beneficial for related applications in photoelectric
conversion. The interfacial charge transfer behavior of MAPbBr3/p-g-C3N4 NCs was analyzed via timeresolved
photoluminescence (TRPL) spectroscopy and singular-value decomposition global fitting
(SVD-GF), which revealed that photoexcited electrons in the conduction band (CB) and shallow-trap (ST)
states of MAPbBr3 could be transferred into the CB of g-C3N4. The fitting results for TRPL traces
indicated that the control of the related compositions could modulate the interfacial charge carrier
dynamics of MAPbBr3/g-C3N4 NCs. An increase in the charge transfer rate constant (ket) for MAPbBr3/g-
C3N4 NCs was discovered when the constituent ratio of p-g-C3N4 was enhanced. Furthermore, we
utilized MAPbBr3/p-g-C3N4 NCs as a photocatalyst to carry out the photocatalytic reduction of pnitrophenol
(PNP) under visible-light irradiation. A significant photoreduction rate (kPNP) of PNP was
observed in the photocatalytic reaction, which indicated the great potential of MAPbBr3/p-g-C3N4 NCs
to convert solar energy into chemical energy. In particular, the present investigation opens a new field
for organolead bromide perovskites in applications in photocatalysis, as well as related photoelectric
conversion. |
| 關鍵字： | |
| 著作名稱： | An electrochemical method to enhance the performance of metal oxides for photoelectrochemical water oxidation, J. Mater. Chem. A, 2016, 4, 2849-2855. [SCI, IF:7.44] |
| 年度： | 2016 |
| 類別： |
期刊論文
J. Mater. Chem. A
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Organolead Halide Perovskite Nanocrystals: Branched Capping Ligands Control Crystal Size and Stability, Angew. Chem. Int. Ed. 2016, 128 (31), 9010-9014 [SCI, IF:11.261] |
| 年度： | 2016 |
| 類別： |
期刊論文
Angew. Chem. Int. Ed.
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Graphene quantum dots conjugated with polymers for two-photon properties under two-photon excitation, Nanoscale, 2016, 8, 16874-16880. [SCI, IF:7.76] |
| 年度： | 2016 |
| 類別： |
期刊論文
Nanoscale
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Two-Photon Photoexcited Photodynamic Therapy and Contrast Agent with Antimicrobial Graphene Quantum Dots, ACS Appl. Mater. Interfaces, 2016,8, 30467-30474. [SCI, IF:7.145] |
| 年度： | 2016 |
| 類別： |
期刊論文
ACS Appl. Mater. Interfaces
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Towards Understanding Unusual Photoluminescence Intensity Variation of Ultrasmall Colloidal PbS Quantum Dots with the Formation of Thin CdS Shell, Phys. Chem. Chem. Phys. 2016, 18 (46), 31828-31835. [SCI, IF:4.449] |
| 年度： | 2016 |
| 類別： |
期刊論文
Phys. Chem. Chem. Phys
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Interfacial charge carrier dynamics of cuprous oxide-reduced graphene oxide (Cu2O-rGO) nanoheterostructures and their related visible-light-driven photocatalysis, Appl. Catal. B: Environmental, 2017, 204, 21-32. [SCI, IF: 9.446] |
| 年度： | 2016 |
| 類別： |
期刊論文
Appl. Catal. B: Environmental
|
| 摘要： | We demonstrated a facile and green preparation of cuprous oxide-reduced graphene oxide (Cu2O-rGO) nanoheterostructures through a photochemical reaction. The density of Cu2O nanocubes (NCs) grown on the rGO surface can be well controlled by modulating the concentration of GO employed in the reaction. Because of the relatively low potential of Fermi level of rGO, the photoexcited electrons on the conduction band (CB) of Cu2O NCs preferentially transfer to rGO, simultaneously leaving photogenerated holes on the valence band (VB) of Cu2O, resulting in the notable charge carrier separation properties. Time-resolved photoluminescence (TRPL) spectra were collected to quantitatively analyze the electron transfer rate constant (ketket) between Cu2O NCs and rGO, and the dependence of the ket on the rGO constituent in Cu2O-rGO nanoheterostructures. Among all the samples tested, the Cu2O-rGO nanoheterostructure with the rGO constituent of 2 wt.% (denoted as Cu2O-rGO-2) displayed the largest ket as well as the most pronounced charge separation property. The optimized Cu2O-rGO-2 showed the best methyl orange (MO) photocatalytic degradation performance, which was highly consistent with the trend of the obtained ketket results. As compared with relevant commercial products, such as N-doped P-25 TiO2 and commercial Cu2O powders, the Cu2O-rGO-2 exhibited superior efficiency toward MO degradation under visible light illumination, illustrating its potential for applications in relevant photoelectric conversion processes. The recycling trial showed that the Cu2O-rGO-2 has promising potential for use in the long-term course of photocatalysis to degrade organic pollutants. Furthermore, the photocatalytic efficiency evaluated under natural sunlight demonstrated that the present Cu2O-rGO nanoheterostructure could effectively harvest the energy of solar spectrum and converted it into the chemical energy for organic pollutants degradation. The current study could provide great insights into the design of semiconductor/graphene composites which exhibit remarkable charge separation properties for practical applications in the organic pollutants photodegradation, solar fuel generation as well as photovoltaic devices. |
| 關鍵字： | Cu2O; Graphene; Charge carrier dynamics; Photocatalysis; Visible-light-driven |
| 著作名稱： | Size‐Tunable Synthesis of Hollow Gold Nanospheres through Control of Reaction Temperature. Part. Part. Syst. Charact. 2016, 34, 1600255. [SCI, IF: 4.367] |
| 年度： | 2016 |
| 類別： |
期刊論文
Part. Part. Syst. Charact.
|
| 摘要： | Here, it is demonstrated that the size tunable hollow gold nanospheres (HGNs) of ≈24–122 nm in diameter can be facilely achieved by controlling a signal parameter, reaction temperature, in the synthesis. The varied particle sizes of HGNs result in highly tunable surface plasmon resonance (SPR) absorption in the entire visible to near infrared region of the spectrum, with maximum peak position from 565 to 850 nm when the reaction temperature is varied from 80 to 10 °C. The particle size and structural properties are determined using dynamic light scattering, transmission-mode scanning electron microscopy, and high-resolution transmission electron microscopy. The optical properties are characterized using UV–vis spectroscopy. A mechanism behind the temperature-dependent HGN synthesis is explained by the thermodynamics of homogeneous nuclei formation of the cobalt scaffold. Discrete dipole approximation calculations are performed to simulate the SPR spectrum and provide insight into the relation between the SPR absorption and structural details of the HGNs. This study demonstrates a simple yet effective method based on temperature control for synthesizing produce size tunable HGNs with varying properties of interest for different applications. |
| 關鍵字： | |
| 著作名稱： | Uniform carbon-coated CdS core–shell nanostructures: synthesis, ultrafast charge carrier dynamics, and photoelectrochemical water splitting, J. Mater. Chem. A, 2016, 4, 1078-1086. [SCI, IF:7.44] |
| 年度： | 2015 |
| 類別： |
期刊論文
J. Mater. Chem. A
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Synthesis, Optical Properties, and Exciton Dynamics of Organolead Bromide Perovskite Nanocrystals, J. Phys. Chem. C 2015, 119, 26672-26682. [SCI, IF:4.77] |
| 年度： | 2015 |
| 類別： |
期刊論文
J. Phys. Chem. C
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Shell-thickness dependent electron transfer and relaxation in type-II core–shell CdS/TiO2 structures with optimized photoelectrochemical performance, J. Mater. Chem. A, 2015, 45, 22672-22635. [SCI, IF:7.44] |
| 年度： | 2015 |
| 類別： |
期刊論文
J. Mater. Chem. A
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Ultrafast Exciton Dynamics in InGaN/GaN and Rh/Cr2O3 Nanoparticle Decorated InGaN/GaN Nanowires, J. Phys. Chem. Lett. 2015, 6, 2649-2656. [SCI, IF:7.45] |
| 年度： | 2015 |
| 類別： |
期刊論文
J. Phys. Chem. Lett.
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Modulation of Charge Carrier Dynamics of NaxH2-xTi3O7-Au-Cu2O Z-Scheme Nanoheterostructures through Size Effect, Appl. Catal. B: Environmental, 2015, 163, 343-351. [SCI, IF:8.328] |
| 年度： | 2015 |
| 類別： |
期刊論文
Appl. Catal. B: Environ.
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Design of Novel Metal Nanostructures for Broadband Solar Energy Conversion, International Journal of Spectroscopy 2015, 147423. [SCI] |
| 年度： | 2014 |
| 類別： |
期刊論文
International Journal of Spectroscopy
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Mechanisms behind Plasmonic Enhancement of Photocurrent in Metal Oxides, Austin J Nanomed Nanotechnol. 2014, 2, 4.[SCI] |
| 年度： | 2014 |
| 類別： |
期刊論文
Austin J Nanomed Nanotechnol
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Surface Passivation of TiO2 Nanowires Using a Facile Precursor-Treatment Approach for Photoelectrochemical Water Oxidation, J. Phys. Chem. C, 2014, 118, 15086-15094. [SCI, IF:4.77] |
| 年度： | 2014 |
| 類別： |
期刊論文
J. Phys. Chem. C
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Multicolored Cd1-xZnxSe quantum dots with type-I core/shell structure: single-step synthesis and their use as light emitting diodes, 2014, 6, 3881-3888. [SCI, IF:7.39] |
| 年度： | 2014 |
| 類別： |
期刊論文
Nanoscale
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | A Facile Green Antisolvent Approach to Cu2+-doped ZnO Nanocrystals with Visible-Light-Responsive Photoactivities, Nanoscale 2014, 6, 8796-8803.[SCI, IF:7.76] |
| 年度： | 2014 |
| 類別： |
期刊論文
Nanoscale
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Studies on the Photocatalysis of Core-Shelled SiO2-Ag Nanospheres by Controlled Surface Plasmon Resonance under Visible Light, Appl. Surf. Sci. 2014, 311, 399-404.[SCI, IF:2.71] |
| 年度： | 2014 |
| 類別： |
期刊論文
Appl. Surf. Sci.
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Studies on the annealing and antibacterial properties of the silver embedded aluminum/silica nanospheres, Nanoscale Res. Lett. 2014, 9:307. [SCI, IF:2.77] |
| 年度： | 2014 |
| 類別： |
期刊論文
Nanoscale Res. Lett.
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Au Nanostructure-Decorated TiO2 Nanowires Exhibiting Photoactivity Across Entire UV-Visible Region for Photoelectrochemical Solar Water Splitting, Nano Letters 2013, 13, 3817-3823. [SCI, IF:13.59] |
| 年度： | 2013 |
| 類別： |
期刊論文
Nano Letters
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Au/ZnS core/shell nanocrystals as an efficient anode photocatalyst in direct methanol fuel cells, Chem. Commun., 2013, 49, 8486-8488. [SCI, IF:6.83] |
| 年度： | 2013 |
| 類別： |
期刊論文
Chem. Commun.
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Optical Properties and Exciton Dynamics of Alloyed Core/Shell/Shell Cd1−xZnxSe/ZnSe/ZnS Quantum Dots, ACS Appl. Mater. Interfaces, 2013, 5, 2893-2900. [SCI, IF:7.145] |
| 年度： | 2013 |
| 類別： |
期刊論文
ACS Appl. Mater. Interfaces
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Ag-Nanoparticle-Decorated SiO2 Nanospheres Exhibiting Remarkable Plasmon-Mediated Photocatalytic Properties, J. Phys. Chem. C, 2012, 116 (35), 19039–19045. [SCI, IF:4.77] |
| 年度： | 2012 |
| 類別： |
期刊論文
J. Phys. Chem. C
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Interfacial Charge Carrier Dynamics of the Three-Component In2O3–TiO2–Pt Heterojunction System, J. Phys. Chem. C, 2012, 116 (4), 2967–2975. [SCI, IF:4.77] |
| 年度： | 2012 |
| 類別： |
期刊論文
J. Phys. Chem. C
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Au-decorated NaxH2−xTi3O7 nanobelts exhibiting remarkable photocatalytic properties under visible-light illumination, Appl. Catal. B: Environmental 2010, 97, 389–397. [SCI, IF:8.328] |
| 年度： | 2010 |
| 類別： |
期刊論文
Appl. Catal. B: Environ.
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Photocatalytic degradation and reusable SERS detection by Ag nanoparticles immobilized on g-C3N4/graphene oxide nanosheets |
| 年度： | 2022 |
| 類別： |
期刊論文
Surface & Coatings Technology
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| 摘要： | In this study, graphene oxide (GO) and a carbon 2D materials (g-C3N4 nanosheets) were combined to construct g-C3N4/GO nanosheets through π-π stacking interaction. Moreover, Ag+ ions were reduced to Ag nanoparticles and further grafted onto the g-C3N4/GO nanosheets (Ag@g-C3N4/GO) to impart the dual functionality of photocatalytic degradation and surface enhanced Raman scattering (SERS) detection. The Ag@g-C3N4/GO SERS substrate can be used to detect biomolecules (adenine) and organic pollutants (methylene blue). The X-ray diffraction, scanning electron microscopy, and Raman spectroscopy observations confirmed that g-C3N4 was successfully stacked onto the GO nanosheets. In addition, the Ag@g-C3N4/GO SERS substrate displayed photocatalytic ability. Pollutants in water were photodegraded by irradiation with visible light (405 nm), making the substrate self-cleaning and reusable. Thus, the Ag@g-C3N4/GO SERS nanosheets has potential for application in the photocatalytic degradation of water pollutants and detection of biomolecules. |
| 關鍵字： | Surface-enhanced Raman scattering (SERS), detection, G-C3N4, Graphene oxide nanosheets, Photocatalytic degradation |
| 著作名稱： | Two-Step Process of a Crystal Facet-Modulated BiVO4 Photoanode for Efficiency Improvement in Photoelectrochemical Hydrogen Evolution |
| 年度： | 2022 |
| 類別： |
期刊論文
ACS Appl. Mater. Interfaces
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| 摘要： | The photoactivity of nanoporous bismuth vanadate (BiVO4, BVO) photoanodes that were fabricated by a two-step process (electrodeposition and then thermal conversion) in photoelectrochemical (PEC) hydrogen (H2) evolution can be enhanced about 1.44-fold by improving the constitutive ratio of (111̅), (061), and (242̅) crystal facets. The PEC characterization was carried out to investigate the factors altering the performance, which revealed that the crystal facet modulation could improve the photoactivity of the BVO photoanodes. In addition, the orientation-controlled BVO thin-film electrodes are introduced as evidence that the present crystal facet modulation is the positive effect for BVO photoanodes in PEC. The investigation of energy band structures and interfacial charge carrier dynamics of the BVO photoanodes reveals that the crystal facet modulation could result in a shorter lifetime of charge carrier recombination and larger band bending at the interface between BVO and electrolytes. This outcome could improve the charge separation and charge transfer efficiencies of BVO photoanodes, promoting the efficiency of PEC H2 evolution. Moreover, this crystal facet modulation can combine with co-catalyst decoration to further improve the solar-to-hydrogen efficiency of BVO photoanodes in PEC. This study presents a potential strategy to promote the PEC activity by crystal facet modulation and important insights into the interfacial charge transfer properties of semiconductor photoelectrodes for the application in solar fuel generation. |
| 關鍵字： | |
| 著作名稱： | 3D laminated graphitic carbon nitride decorating with 2D/ 2D Bi2WO6/rGO nanosheets for selective photoreduction of CO2 to CO |
| 年度： | 2022 |
| 類別： |
期刊論文
Int. J. Energy Res.
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| 摘要： | A novel Bi2WO6/rGO/3D-GCN composite with 2D/2D/3D heterojunction is synthesized by a simple microwave-assisted method and used as a visible-light-responsive photocatalyst in the CO2 reduction. The chemical properties and morphology of prepared photocatalysts are identified by a variety of analytic tools and spectroscopies. As a result, the heterojuncted Bi2WO6/3D-GCN exhibits superior CO2 reduction performance as compared to the pristine 3D-GCN, which may be caused by the intimate contact between Bi2WO6 and 3D-GCN. The harvest of visible-light absorption, reduced charge transfer resistance and suppressed recombination of electron-hole pairs are accountable for surpassing performance of Bi2WO6/3D-GCN. Upon further incorporation of rGO into Bi2WO6/3D-GCN heterojunction, the photocatalytic production of CO can be notably boosted by ca. 7.9-fold higher than 3D-GCN, suggesting the key contribution of rGO in facilitating the interfacial charge transfer kinetics and increasing CO2 uptake. This work exemplifies a time and energy-saving method to prepare the unique 3D GCN with laminated hexagonal structure which can serve as a shuttle for Bi2WO6 heterojunction and rGO incorporation. This Bi2WO6/rGO/3D-GCN photocatalyst could offer the potential applications in the natural solar conversions of CO2. |
| 關鍵字： | |
| 著作名稱： | Crystal Facet Dependent Energy Band Structures of Polyhedral Cu2O Nanocrystals and Their Application in Solar Fuel Production |
| 年度： | 2022 |
| 類別： |
期刊論文
J. Phys. Chem. Lett.
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| 摘要： | We demonstrated a facile hydrothermal method to synthesize the (100)-, (110)- and (111)-oriented Cu2O nanocrystals (NCs) by controlling the concentration of the incorporated anions (CO32– and SO32–). The crystal facet dependent activity of the orientation controlled Cu2O NCs in the rhodamine B (RhB) photodegradation and photocatalytic hydrogen (H2) evolution was found to follow the trend: (111) > (110) > (100). The mechanism was investigated by characterizing the optical property, energy band structure, interfacial charge carrier dynamics and reducing ability. The results indicated that the (111)-oriented Cu2O NCs exhibit the higher conduction band (CB) potential as compared with the (110)-oriented and (100)-oriented Cu2O NCs, which resulted in the largest driving force of interfacial electron transfer for (111)-oriented Cu2O NCs to carry out solar fuel generation. The current study offers an easy strategy for crystal facet engineering of semiconductors and provides important physical insights into their electronic properties for the desired solar energy conversions. |
| 關鍵字： | |
| 著作名稱： | Mechanisms of biochar enhanced Cu2O photocatalysts in the visible-light photodegradation of sulfamethoxazole |
| 年度： | 2022 |
| 類別： |
期刊論文
Chemosphere
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| 摘要： | Cu2O nanoparticles are decorated with biochars derived from spent coffee grounds (denoted as Cu2O/SCG) and
applied as visible-light-active photocatalysts in the sulfamethoxazole (SMX) degradation. The physicochemical
properties of Cu2O/SCG are identified by various spectral analysis, electrochemical and photochemical techniques.
As a result, the Cu2O/SCG exhibits the higher removal efficiency of SMX than the pristine Cu2O under
visible light irradiation. We can observe that Cu2O could be incorporated onto the SCG biochars with rich oxygen
vacancies/adsorbed hydroxyl groups. In addition, the Cu2O/SCG has the lower charge transfer resistance, faster
interfacial electron transfer kinetics, decreased recombination of charge carriers and superior absorbance of
visible light. The construction of band diagrams for Cu2O/SCG and pristine Cu2O via UV–vis spectra and
Mott Schottky plots suggest that the band energy shifts and higher carrier density of Cu2O/SCG may be
responsible for the photocatalytic activity enhancements. From the radical scavenger experiments and electron
paramagnetic resonance spectra, the aforementioned energy shifts could decrease the energy requirement of
transferring photoinduced electrons to the potential for the formation of active superoxide radicals (⋅O2 ) via one
and two-electron reduction routes in the photocatalytic reaction. A proposed degradation pathway shows that
⋅O2 and h+ are two main active species which can efficiently degrade SMX into reaction intermediates by
oxidation, hydroxylation, and ring opening. This research demonstrates the alternative replacement of conventional
carbon materials for the preparation of biochar-assisted Cu2O photocatalysts which are applied in the
environmental decontamination by using solar energy. |
| 關鍵字： | |
| 著作名稱： | Charge Carrier Dynamics of CsPbBr3/g-C3N4 Nanoheterostructures in Visible-Light-Driven CO2-to-CO Conversion |
| 年度： | 2022 |
| 類別： |
期刊論文
J. Phys. Chem. Lett.
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| 摘要： | The photon energy-dependent selectivity of photocatalytic CO2-to-CO conversion by CsPbBr3 nanocrystals (NCs) and CsPbBr3/g-C3N4 nanoheterostructures (NHSs) was demonstrated for the first time. The surficial capping ligands of CsPbBr3 NCs would adsorb CO2, resulting in the carboxyl intermediate to process the CO2-to-CO conversion via carbene pathways. The type-II energy band structure at the heterojunction of CsPbBr3/g-C3N4 NHSs would separate the charge carriers, promoting the efficiency in photocatalytic CO2-to-CO conversion. The electron consumption rate of CO2-to-CO conversion for CsPbBr3/g-C3N4 NHSs was found to intensively depend on the rate constant of interfacial hole transfer from CsPbBr3 to g-C3N4. An in situ transient absorption spectroscopy investigation revealed that the half-life time of photoexcited electrons in optimized CsPbBr3/g-C3N4 NHS was extended two times more than that in the CsPbBr3 NCs, resulting in the higher probability of charge carriers to carry out the CO2-to-CO conversion. The current work presents important and novel insights of semiconductor NHSs for solar energy-driven CO2 conversion. |
| 關鍵字： | |
| 著作名稱： | Monoclinic-rich CsPbBr3/a-Fe2O3 S-scheme heterojunction for highly efficient thermal-assisted CO2 photoreduction |
| 年度： | 2022 |
| 類別： |
期刊論文
Journal of Environmental Chemical Engineering
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| 摘要： | A new monoclinic-rich CsPbBr3/porous α-Fe2O3 with 3D/3D heterojunction has been prepared by a facile one-step ligand-assisted reprecipitation (LARP) under low temperature and air atmosphere. The morphologies (i.e., cubic and monoclinic phases) of CsPbBr3 are easily tuned by varying the ratios of precursor solution during the LARP process. We observed that monoclinic-rich CsPbBr3 is favorable to the photocatalytic reduction of CO2 with the superior electron consumption rate of 1.42 mmol g−1 h−1. Upon the heterojunction of monoclinic-rich CsPbBr3 with porous α-Fe2O3, the electron consumption rate is further enhanced to 3.38 mmol g−1 h−1, which is ca. 2.4-fold improvements of pristine monoclinic-rich CsPbBr3. More importantly, the activity can maintain ca. 90% after three consecutive cycles of photocatalytic CO2 reduction. The surpassing performance could be attributed to the higher CO2 uptakes, superior charge separation properties of the CsPbBr3/α-Fe2O3 heterojunction. The apparent activation energies of CO and H2 production calculated by the Arrhenius equation are 26.67 and 31.95 kJ mol−1, respectively. Time-resolved photoluminescence and ultraviolet photoelectron spectroscopy were used to evidence that the S-scheme pathway with an interfacial charge transfer constant of 2.53 × 108 s−1 occurs at the interface of monoclinic-rich CsPbBr3/porous α-Fe2O3. This study demonstrates a very simple wet-chemistry route to synthesize efficient morphology-dependent perovskite/α-Fe2O3 heterojunctions with 3D/3D construction which may provide the promising applications in the solar conversions of CO2. |
| 關鍵字： | |
| 著作名稱： | Piezocatalytic and doping effects synergistically enhance the oxygen evolution in Sb-doped zinc oxide nanorod arrays as a photoanode for photoelectrochemical water splitting |
| 年度： | 2022 |
| 類別： |
期刊論文
MRS Energy & Sustainability
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| 摘要： | An efficient separation and transport of charges is essential in order to enhance photoelectrochemical (PEC) water splitting efficiency. Herein, we report that PEC water splitting output performance of undoped ZnO nanorods (NRs) is firstly enhanced by p-type Sb doping on oxygen evolution reaction (OER), grown by a facile chemical bath deposition. The specimen with 2 at% Sb-doped ZnO NRs (2 at% Sb-ZnO NRs) yields the highest photocurrent density of 1.07 mA/cm2 under a Xe lamp with a power of 100 mW/cm2, two times that of the undoped ZnO NRs (0.54 mA/cm2). Additionally, piezotronic effect is applied to further enhance PEC output performance using an in-house fabricated device. When the sample of 2 at% Sb-ZnO NRs is subject to a strain varying from a compressive strain of ε − 0.15% to a tensile strain of ε 0.15%, the photocurrent density varies from 0.71 mA/cm2 to 1.37 mA/cm2 accordingly caused by the change of the piezopotential-induced Schottky barrier height. Therefore, compared to the strain-free condition of the undoped ZnO NRs, the PEC photocurrent density gained an enhancement of 98% by p-type Sb doping and a further enhancement of 28% by piezotronic effect through tensile strain, leading to 154% overall enhancement. In this work, we propose a feasible scheme to develop high-performance ZnO-based photoelectrodes for PEC water splitting. |
| 關鍵字： | catalytic, chemical reaction, photochemical, piezoelectric, piezoresponse |
| 著作名稱： | Surface Modification of TiO2 Nanowires for Photoelectrochemical Water Splitting |
| 年度： | 2017 |
| 類別： |
會議論文
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Synthesis and charge carrier dynamics of organolead bromide perovskite/graphitic carbon nitride nanoheterostructures for photocatalytic CO2 reduction |
| 年度： | 2017 |
| 類別： |
會議論文
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | 還原態氧化石墨烯/氧化亞銅複合結構之載子動力學 |
| 年度： | 2016 |
| 類別： |
會議論文
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | ULTRAFAST EXCITON DYNAMICS IN ORGANOLEAD BROMIDE PEROVSKITE NANOCRYSTALS |
| 年度： | 2016 |
| 類別： |
會議論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Ultrafast interfacial charge transfer dynamics in CdSe quantum dot-sensitized TiO2 for photoelectrochemical solar hydrogen generation |
| 年度： | 2015 |
| 類別： |
會議論文
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Plasmonic enhancement of solar water splitting in Au-decorated TiO2 nanowire array |
| 年度： | 2013 |
| 類別： |
會議論文
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Ternary Quantum Dots with Tunable Emission Wavelength and Their Use as Light Emitting Diodes |
| 年度： | 2011 |
| 類別： |
會議論文
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| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Cuprous Oxide-Reduced Graphene Oxide Nanoheterostructures for Visible-Light-Driven Photocatalysis |
| 年度： | 2016 |
| 類別： |
會議論文
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| 摘要： | |
| 關鍵字： | |