國立臺南大學教師基本資料

基本資料
姓名 蒲盈志
系所 材料科學系
職稱 副教授
校內分機 665
傳真
辦公室/研究室 格致樓 506B
E-mail ycpu@mail.nutn.edu.tw
網址 https://scholar.google.com.tw/citations?userkVwZrp0AAAAJ&hlzh-TW
專長/研究領域 一維奈米異質結構, 超快雷射光譜,載子動力學,再生能源應用
 

畢業學校國別主修學門學位修業期間
國立中興大學台灣化學系學士2000/09~2004/06
國立成功大學台灣化學所碩士2004/09~2006/07
國立交通大學台灣材料科學與工程所博士2008/09~2014/01

服務機關部門 / 系所職稱服務期間
工業技術研究院材料與化學工程所副研究員2006/10~2012/07
美國加州大學 聖塔克魯茲分校化學與生物化學系訪問學者(科技部千里馬計畫)2012/08~2013/08
美國加州大學 聖塔克魯茲分校化學與生物化學系博士後研究員2014/02~2015/07

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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
摘要
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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
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
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
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
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
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.
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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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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. [SCI IF: 8.758]
年度2021
類別期刊論文
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
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
摘要
關鍵字
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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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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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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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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名稱ULTRAFAST EXCITON DYNAMICS IN ORGANOLEAD BROMIDE PEROVSKITE NANOCRYSTALS
年度2016
類別會議論文
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名稱Surface Modification of TiO2 Nanowires for Photoelectrochemical Water Splitting
年度2017
類別會議論文
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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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