| 著作名稱： | Hydrogenated Anatase and Rutile TiO2 for Sodium-Ion Battery Anodes |
| 年度： | 2021 |
| 類別： |
期刊論文
ACS Appl. Energy Mater.
|
| 摘要： | Defective transition metal oxides prepared via a hydrogenation treatment have attracted growing attention for use as electrode materials of batteries and supercapacitors due to their improved electrochemical properties. In this work, two TiO2 phases, namely, rutile (TiO2-R) and anatase (TiO2-A), and their hydrogenated phases (denoted with the prefix “H”) are investigated as anodes for sodium-ion batteries. The charge–discharge properties of both phases can be enhanced via a high-pressure hydrogenation treatment. For example, H-TiO2-A exhibits exceptional high-rate performance (100 mA h g–1 at 10,000 mA g–1 vs 5 mA h g–1 at the same current rate for TiO2-A) and great cycling stability (80% capacity retention after 4500 cycles). The introduction of oxygen vacancies increases the electronic and ionic conductivity of TiO2 and the disordered structure offers more active sites for electrochemical reactions. The H-TiO2-R and H-TiO2-A electrodes are compared for sodium-ion battery applications. The superior performance of the former electrode is supported by the generalized gradient approximation Perdew–Burke–Ernzerhof density functional calculation. |
| 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 |
| 年度： | 2019 |
| 類別： |
期刊論文
ACS Appl. Mater. Interfaces
|
| 摘要： | Titanium dioxide (TiO2) nanorods (NRs) are widely used as photoanodes in photoelectrochemical (PEC) solar fuel production because of 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, the anatase TiO2 seed layer was added into the interface between the rutile TiO2 NRs 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 spectroscopy and PEC analyses, including Mott–Schottky, electrochemical impedance spectroscopy, 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 NR photoanode 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 development of photoelectrode materials in solar energy conversions. |
| 關鍵字： | |
| 著作名稱： | The transmittance and sheet resistance of chemically and heat reduced graphene oxide film |
| 年度： | 2018 |
| 類別： |
期刊論文
Optical and Quantum Electronics
|
| 摘要： | The graphene oxide (GO) sheets were prepared from Hummer’s method. The reduced process is important to graphene related materials for widely functional use in many photoelectric fields. Chemically and heat reduced treatment are carried out in this research and the electrical and optical properties of reduced GO films are measured. The size of GO sheets was examined by transmission electron microscopy with a size of about 5–6 μm. The chemically converted graphene (CCG) film are made by spin coating method. We used different GO concentration and different spin coating times to investigate the properties of graphene transparent conductive films. As the decrease of the GO concentration of solution and the times of spin coating, the transmittance is higher. The electrical property of
the mixing of GO and CCG is more stable than the GO sheets only, this is discussed in this research and it is cause by the stacking condition of sheets. The conductivity of reduced graphene oxide film come from GO is lower than that come from CCG, we suppose that is because that the overlapping is less (i.e. film-forming ability) in the former, the transmittance and sheet resistance are 56 T% and 50 kohm/sq. |
| 關鍵字： | graphene, exfoliation, reduction, resistance, transmittance |
| 著作名稱： | Preparation and optical properties of sonication-assisted nitrogen doped graphene oxide sheets |
| 年度： | 2016 |
| 類別： |
期刊論文
Optical and Quantum Electronics
|
| 摘要： | The graphene and graphene oxide sheets were prepared from directly exfoliated and Hummer’s method. Nitrogen doping was applied with the assistance of ultrasonicator to achieve doping via a simple, low-cost aqueous route. The size of graphene and graphene oxide sheets was examined by transmission electron microscopy with a size of
several micrometer. The doping phenomenon was achieved by the addition of aqua ammonia and the analysis were examined by Raman microscopy. The approve of N-doping was got with the appearance of G0 band. The existence of nitrogen element were further examined by energy dispersive spectroscopy. |
| 關鍵字： | Graphene, Liquid-phase exfoliation, Large-area, Ultrasonication, Direct exfoliation graphene sheet |
| 著作名稱： | A complementary electrochromic device based on W18O49 nanowire arrays and Prussian blue thin films |
| 年度： | 2016 |
| 類別： |
期刊論文
RSC Advances
|
| 摘要： | Tungsten oxides (W18O49) nanowire arrays as effective electrochromic working electrodes were fabricated on seed-free FTO glasses through a facile solvothermal process. XRD, FESEM and TEM were used to characterize the phase, morphology and nanostructure. Uniform monoclinic W18O49 nanowire arrays can be obtained at 180 C for 5 h. In the assembled electrochromic device the W18O49 nanowire array films show a fast response and switching time, extracted for a 50% transmittance change of 10.8 s for coloration (tc) and 3.1 s for bleaching (tb), which surpass current traditional devices using monoclinic tungsten oxide (WO3) as the electrochromic material. The reasons can be attributed to their large specific surface area, special tunnel structure and non-stoichiometry characteristics. A complementary electrochromic device combining the W18O49 nanowire arrays with Prussian blue film shows a higher
optical contrast (59.05% at 632.8 nm) and a faster switching response with a coloration time of 6.9 s and a bleaching time of 1.2 s, superior to the single layer W18O49 nanowire device. The complementary device with excellent electrochromic performance demonstrates a great potential for practical application. |
| 關鍵字： | tungsten trioxide, nanowires, hydrothermal, electrochromic |
| 著作名稱： | Direct Growth of Crystalline Tungsten Oxide Nanorod Arrays by a Hydrothermal Process and Their Electrochromic Properties |
| 年度： | 2016 |
| 類別： |
期刊論文
Journal of Electronic Materials
|
| 摘要： | Transparent crystalline tungsten oxide nanorod arrays for use as an electrochromic layer have been directly prepared on fluorine-doped tin oxidecoated glass via a facile tungsten film-assisted hydrothermal process using aqueous tungsten hexachloride solution. X-ray diffraction analysis and fieldemission scanning electron microscopy were used to characterize the phase and morphology of the grown nanostructures. Arrays of tungsten oxide nanorods with diameter of 22 nm and length of 240 nm were obtained at 200C after 8 h of hydrothermal reaction. We propose a growth mechanism for the deposition of the monoclinic tungsten oxide phase in the hydrothermal environment. The tungsten film was first oxidized to tungsten oxide to provide seed sites for crystal growth and address the poor connection between the growing tungsten oxide and substrate. Aligned tungsten oxide nanorod arrays can be grown by a W thin film-assisted heterogeneous nucleation process with NaCl as a structure-directing agent. The fabricated electrochromic device demonstrated optical modulation (coloration/bleaching) at 632.8 nm of 41.2% after applying a low voltage of 0.1 V for 10 s, indicating the potential of such nanorod array films for use in energy-saving smart windows. |
| 關鍵字： | Tungsten oxide, nanorod, electrochromic, hydrothermal |
| 著作名稱： | J. C. Tsai, M. H. Hon, and I. C. Leu*, Preparation of CoS2 nanoflake arrays through ion exchange reaction of Co(OH)2 and their application as counter electrode for dye-sensitized solar cell |
| 年度： | 2015 |
| 類別： |
期刊論文
RSC Advances
|
| 摘要： | The cobalt sul?de nano?ake arrays prepared by the transformation of Co(OH)2 nano?ake arrays using the ion exchange reaction method were incorporated into Pt-free dye-sensitized solar cells (DSSCs). Morphologies and crystal structures of the cobalt sul?de and cobalt hydroxide nano?akes arrays were characterized by SEM, TEM and XRD analyses. The electrochemical properties were determined by cyclic voltammetry (CV) measurement. The cobalt sul?de nano?akes which were composed of CoS2 single crystals and their aggregates dispersing in the amorphous cobalt sul?de matrix were completely transferred by substitution of S2?? for O2?? in the ion exchange reaction. The DSSC assembled with cobalt sul?de nano?ake arrays as the counter electrode showed a photovoltaic conversion e?ciency of 5.20%, which was close to that of DSSC with sputtered Pt as the counter electrode (5.34%). Therefore, the cobalt sul?de nano?ake array ?lm can be considered as a promising alternative counter electrode for use in DSSCs due to its large surface area and high electrocatalytic performance. |
| 關鍵字： | |
| 著作名稱： | Synthesis of TiO2(B)/SnO2 composite materials as an anode for lithium-ionbatteries |
| 年度： | 2015 |
| 類別： |
期刊論文
Ceramics International
|
| 摘要： | A TiO2(B) nanosheets/SnO2 nanoparticles composite was prepared by the hydrothermal and chemical bath deposition(CBD)methods,and its electrochemical properties were investigated for use as the anode material of a lithium-ion battery.The as-prepared composites consisted of monoclinic-phase TiO2(B) nanosheets and cassiterite structure SnO2 nanoparticles, in which SnO2 nanoparticles were uniformly decorated on the
TiO2(B)nanosheets. The TiO2(B)/SnO2 composite showed a higher reversible capacity and better durability than that of the pure TiO2(B) for use as a battery anode. The composite electrodes exhibiting a high initial discharge capacity of 2239.1mAhg-1 and a discharge capacity of more than 868.7mAhg-1 could be maintained after 50 cycles at 0.1C in a voltage range of 1.0–3.0 V at room temperature. The results suggest that TiO2(B) nanosheets coated with SnO2 could be suitable for use as a stable anode material for lithium-ion batteries.In addition, the coulombic efficiency of the nanosheets remains at an average of 93.1% for the 3rd–50th cycles. |
| 關鍵字： | li ion battery, titania, tin oxide, anode |
| 著作名稱： | C. W. Chang, M. H. Hon, and I. C. Leu*, Ultrasound-assisted preparation of large-area few-layer graphene |
| 年度： | 2015 |
| 類別： |
期刊論文
ECS Journal of Solid State Science and Technology
|
| 摘要： | We use a simple liquid-phase exfoliation process to prepare a large-area 2-D material, few-layer graphene (FLG) sheets, with the assistance of short-time sonication. Big-sized and layered raw materials, natural graphite flakes (NGFs), were used in this research. No surfactant was added, and only low boiling point solvents and ionic chemicals were used. NGFs was added as the raw material and ethanol and ammonia were used as solvents, then ultrasound was applied to help direct exfoliation in a bath. The size of the
as-prepared directly exfoliated graphene sheets (DEGS) was greater than 20 μm on the longer side. The number of layers is less than five, and the presence of a Moir´e fringe is due to the folding occurring in the as-prepared DEGS. The direct exfoliation mechanism for preparing large-area graphene sheets is proposed. The X-ray diffraction patterns provide the evidence of the increasing of the layer spacing. The layer spacing of graphite is increased after the sonication treatment with the addition of the ethanol, ammonia and NaCl. The concentration of large-area DEGS suspension is up to 18 ∼ 20 μg/mL in a simple and short time process. |
| 關鍵字： | graphene, exfoliation, ultrasonic |
| 著作名稱： | C. H. Lu, M. H. Hon, C. Y. Kuan, and I. C. Leu*, Controllable synthesis of W18O49 nanowire arrays and their application in electrochromic devices |
| 年度： | 2015 |
| 類別： |
期刊論文
J Mater Sci
|
| 摘要： | Tungsten oxide nanowire arrays as effective electrochromic working electrodes were fabricated on seed-free FTO glass through a facile solvothermal process. Polyethylene glycol was used as the structure-directing agent to control the crystal growth because of selective absorption on the facet of tungsten oxide crystals. Phase identification and growth mechanism of monoclinic W18O49 nanowire arrays are also extensively discussed. Uniform transparent W18O49 nanowire arrays film exhibits remarkable performance of electrochromic properties, which include high contrast (49.64 % at 632.8 nm), high electrochromic stability ([3000 CV cycles), and fast coloration/bleaching response (tc * 7.9 s, tb * 1.4 s). These
properties of the W18O49 nanowire arrays film endow its promising practical applications in large-area smart windows. |
| 關鍵字： | electrochromic, tungsten trioxide, nanorod |
| 著作名稱： | H. Y. Wu, M. H. Hon, C. Y. Kuan, and I. C. Leu*, Hydrothermal synthesis of Li4Ti5O12 nanosheets as anode materials for lithium ion batteries |
| 年度： | 2015 |
| 類別： |
期刊論文
RSC Advances
|
| 摘要： | Spinel Li4Ti5O12 (LTO) has the advantages of superior cycling performance, long and stable voltage plateau, enhanced safety, low cost, and environmental friendliness. LTO nanosheets were synthesized by a
hydrothermal method using Ti(OC4H9)4 and LiOH as the raw materials, followed by a subsequent heat treatment to get the desired phase. The effects of the reactant concentration and heat treatment
temperature on the phase structure were studied to optimize process parameters for preparing the LTO
nanosheets. The results demonstrate that the LTO nanosheets obtained by a hydrothermal method with
2 M LiOH and a subsequent heat treatment at 550 C exhibit an outstanding stable capacity of 175 mA h
g-1 at 0.1 C to 20 C for 40 cycles. The ameliorated electrode-performance is ascribed to the
nanostructure of the materials, which provides shorter diffusion-paths and a faster migration rate for
both ions and electrons. The newly synthesized nanostructured LTO materials can offer good high rate
performance and stability. Li4Ti5O12 nanosheets were developed in this paper for use as anode materials
for lithium-ion power batteries with high-rate applications. |
| 關鍵字： | lithium titanate, nanosheet, hydrothermal, li-ion battery |
| 著作名稱： | J. C. Tsai, M. H. Hon, and I. C. Leu*, Fabrication of mesoporous CoS2 nanotube arrays as the counter electrodes of dye-sensitized solar cells |
| 年度： | 2015 |
| 類別： |
期刊論文
Chemistry - An Asian Journal
|
| 摘要： | Mesoporous cobalt sulfide nanotube arrays on FTO-coated glass were synthesized by combining three
simple technologies: the selective etching of ZnO sacrificial templates, mesoporous Co3O4 formation from cobalt-chelated chitosan, and ion-exchange reaction (IER). The mesoporous Co3O4 nanotubes composed of the Co3O4 nanoparticles possess a high surface area and are taken advantage for further removal of templates and IER. The morphologies and crystal structures of the CoS2 nanotube arrays were characterized by SEM, TEM, and XRD analyses. Their electrocatalytic properties were determined by electrochemical analyses including cyclic voltammetry measurements and Tafel polarization. The DSSCs assembled with a CoS2 counter electrode achieved a power conversion efficiency of 6.13 %, which was comparable to that of the DSSC with the Pt counter electrode (6.04 %). This indicates that the mesoporous CoS2 nanotube array can be a low-cost and efficient alternative for the reduction of electrolytes in DSSCs. |
| 關鍵字： | dye-sensitized solae cell, cobalt sulfide, nanotube, counter electrode |
| 著作名稱： | C. H. Lu, M. H. Hon, C. Y. Kuan, and I. C. Leu*, Preparation of WO3 nanorods by a hydrothermal method for electrochromic device |
| 年度： | 2014 |
| 類別： |
期刊論文
Japanese Journal of Applied Physics
|
| 摘要： | Uniform WO3 nanorods were prepared by a hydrothermal process, and the synthesis was accomplished by using NaCl as the capping agent and Na2WO4 as the inorganic precursor. Scanning electron microscopy, X-ray diffractometer, transmission electron microscopy and UV–visible spectroscopy were used to characterize the morphology, phase, and nanostructure of the resulting nanorods. The effects of pH and the amount of NaCl capping agent on the morphology of the WO3 nanorods were investigated. Uniform and regular aligned WO3 nanorod ?lms can be achieved by self-assembly in a drop coating process. Moreover, the electrochromic devices based on WO3 nanorods display a deep blue color and have low transmittance (2%) in the colored state, especially in the infrared range, which may provide a promising platform for energy-saving smart windows, and other electro-optical applications. |
| 關鍵字： | |
| 著作名稱： | H. Y. Wu, M. H. Hon, C. Y. Kuan, and I. C. Leu*, Preparation of TiO2(B) nanosheets by a hydrothermal process and their application as an anode for lithium ion batteries |
| 年度： | 2014 |
| 類別： |
期刊論文
Journal of Electronic Materials
|
| 摘要： | TiO2 nanosheets with single monoclinic phase have been synthesized by a hydrothermal method using 6 M NaOH aqueous solution at 180C. TiO2 nanosheets exhibited surface area of 100 m2 g1, which is larger than those obtained by solid-state reaction. The capability of lithium-ion batteries could be strongly enhanced by TiO2(B) nanosheets to yield discharge capacity higher than 200 mAh g1, even upon 25 cycles of 0.1-C-rate discharge–charge operations, showing highly reversible capacity and good cycling stability with excellent capacity retention of 96% with water-based binder. The results suggest that TiO2(B) nanosheets could be a promising negative electrode material for use in lithium-ion batteries.
|
| 關鍵字： | |
| 著作名稱： | C. M. Chang, M. H. Hon, and I. C. Leu*, Influence of size and density of Au nanoparticles on ZnO nanorod arrays for sensing reducing gases, J. Electrochem. Soc., 160 [9] (2013) B160. |
| 年度： | 2013 |
| 類別： |
期刊論文
J. Electrochem. Soc.
|
| 摘要： | Au nanoparticles are hydrothermally loaded on the ZnO nanorod arrays (NRs), and the characteristics of Au can be modulated by controlling the precursor concentration. The morphology, crystallinity and composition of Au/ZnO nanorods are characterized by SEM, XRD and TEM. Moreover, the growth behavior and mechanism of Au nanoparticles with different sizes and populations on ZnO are proposed and clearly elucidated. Furthermore, the influence of Au nanoparticle decoration on ZnO NRs used for CO gas sensor is discussed in terms of its surface configuration and the related sensitization mechanisms. It is found that the gas sensitivity toward C2H5OH is superior to that of H2 and CO in the Au/ZnO NRs, especially for higher concentrations of analyte, and the result is ascribed to the difference in electron donating effect and the increasing quantity in chemisorbed oxygen by the catalytic effect of Au nanoparticles. |
| 關鍵字： | |
| 著作名稱： | J. C. Tsai, M. H. Hon, and I. C. Leu*, Growth of Aligned Single-Crystalline TiO2 Nanorod Arrays on Transparent Conducting Oxide Coated Glass, Japanese Journal of Applied Physics, 52 [6] (2013) 06GG09. |
| 年度： | 2013 |
| 類別： |
期刊論文
Japanese Journal of Applied Physics
|
| 摘要： | In this work, we report a simple hydrothermal method for growth of aligned TiO2 nanorod arrays directly on SnO2:F (FTO) coated glass substrates without any seed layer. The rectangular nanorod is single crystalline with a tetragonal rutile structure. The diameter, length and density of the
nanorods are determined by the synthesis temperature. When synthesis temperature increases from 110 to 190 C, the diameter increases from 53 to 249 nm, and the length increases from to 324 to 1904 nm. However, the highest density is obtained at 150 C due to nuclei coalescence at
the high synthesis temperature. The activation energy for formation of TiO2 nanorod arrays is 102 kJ/mol obtained by using an Arrhenius equation. |
| 關鍵字： | |
| 著作名稱： | S. K. Tzeng, M. H. Hon, and I. C. Leu*, Suppressing the atmosphere-induced performance instability of solution-grown zinc oxide-nanowire ultra-violet photodetector by hydrothermal treatment in water, Mater. Chem. Phys., 139 (2013) 963. |
| 年度： | 2013 |
| 類別： |
期刊論文
Materials Chemistry and Physics
|
| 摘要： | The tunable recovery time and photosensitivity are achieved by controlling the concentration of oxygen
vacancies on the surface of ZnO-nanowire (ZnO-NW) photodetector (PD) through a hydrothermal treatment in pure water. Performance instability originates from the interaction of oxygen vacancies near ZnO surface with the atmosphere during service. A novel conception of decreasing the concentration of oxygen vacancy for decreasing photoresponse time is proposed and achieved by a hydrothermal treatment. The rationale can be widely used for compensating oxygen vacancies of nanostructures with
complex morphology at low temperature. |
| 關鍵字： | |
| 著作名稱： | J. H. Lee, S. Y. Tsai, C. H. Kuo, M. H. Hon, and I. C. Leu*, Effect of the coating film thickness on the fabrication of ordered TiO2 thin film microstructures by transfer printing, Ceram. International, 39 (2013) 4069. |
| 年度： | 2013 |
| 類別： |
期刊論文
Ceramics International
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. Y. Kuan, C. W. Lin, M. H. Hon, and I. C. Leu*, ZnO Morphology Development Controlled by Tuning the Hydrolysis Process, J. Crystal Growth, 372 (2013) 213. |
| 年度： | 2013 |
| 類別： |
期刊論文
Journal of Crystal Growth
|
| 摘要： | A novel and simple wet process for producing ZnO submicroplate structures is reported. In the solution system, the morphology development and the size variation can be controlled by altering the amount of water added due to a controlled hydrolysis process of CH3COO?, i.e. the increased concentration of hydroxyl ions. When increasing the amount of water up to 10ml, the amount of OH? ions increased, was adsorbed onto the ZnO (0001) plane, and eventually the [0001] growth direction was impeded. The morphology development and change in growth direction due to the ion adsorption are identified using transmission electron microscopy. In summary, the water can be added to act as a shape modifier for ZnO crystals, and this process presents a new way of synthesizing different structures of ZnO. |
| 關鍵字： | |
| 著作名稱： | C. M. Chang, M. H. Hon, and I. C. Leu*, Outstanding H2 sensing performance of Pd nanoparticle-decorated ZnO nanorod arrays and the temperature-dependent sensing mechanisms, ACS Adv. Mater. Interfaces, 5 (2013) 135. |
| 年度： | 2013 |
| 類別： |
期刊論文
ACS Adv. Mater. Interfaces
|
| 摘要： | The nearly monodispersed Pd nanoparticles with controllable density on ZnO nanorod arrays were prepared by the unique PVP-mediated photochemical deposition (PCD). The changes in morphology and dispersion of Pd on ZnO surface are ascribed to the stabilizing property and self-assembly characteristic of PVP being exploited during PCD. There are three temperature-dependent H2 sensing mechanisms in those Pd/ZnO NRs, including general oxygen
adsorption/desorption mode within 200?300 °C, surface
conductivity mode at 60?120 °C and palladium hydride (PdHx) formation at room temperature, which causes a significant discrepancy in sensitivity variations as a function of Pd density. It is also verified that the electronic sensitization related to the transition of Pd2+/Pd0 redox couple predominates the promoting mechanism in Pd/ZnO NRs used for sensing H2 at 200?300 °C. Therefore, the gas sensitivity to 500 ppm H2 of Pd/ZnO NRs can be significantly improved by around 553-fold (S, Ra/Rg 1106) at 260 °C through decorating an adequate amount of discrete Pd nanoparticles instead of the Pd clusters,
moreover, the corresponding sensitivity at room temperature is 16.9 that is superior to some promising devices reported in the literatures. |
| 關鍵字： | |
| 著作名稱： | C. M. Chang, M. H. Hon, and I. C. Leu*, Effect of seed layer on the growth and the consequent gas sensing characteristics of ZnO nanorod arrays using aqueous chemical growth. |
| 年度： | 2013 |
| 類別： |
期刊論文
J. Sol-gel Sci. Technol.
|
| 摘要： | The ZnO nanorod arrays are grown on the sol–
gel-derived seed layer through aqueous chemical growth,
and then assembled as gas sensors for detecting carbon
monoxide (CO). It is found that the structural and photoluminescent properties of the ZnO nanorod arrays are different as they are grown on seed layers annealed at
different temperature (300–700 C), which is ascribed to
distinct growth kinetics of nanorods on the annealed seed
layer. Moreover, the correlation between the exposed surface
area and the defect density of those ZnO nanorod arrays points out the intrinsic (interior) defects can dominate
the green emission instead of surface defects in the
present study. Furthermore, the quantities of chemisorbed
oxygen on ZnO nanorod arrays can be estimated through
XPS analysis. Consequently, the influence of intrinsic
defects and chemisorbed oxygen on the electrical properties
and gas sensitivities of ZnO nanorod arrays has been
clearly elucidated. It is demonstrated that the more adsorbed oxygen and an appropriate amount of intrinsic defects is advantageous to obtain superior CO gas sensitivity for ZnO nanorod arrays. |
| 關鍵字： | |
| 著作名稱： | Improvement in CO sensing characteristics by decorating ZnO nanorod arrays with Pd nanoparticles and the related mechanism |
| 年度： | 2012 |
| 類別： |
期刊論文
RSC Advances
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Patterns of solution-processed graphene oxide produced by a transfer printing method |
| 年度： | 2012 |
| 類別： |
期刊論文
J. Electrochem. Soc.
|
| 摘要： | We use a simple and all-aqueous method, transfer printing, to pattern solution-processed graphene oxide (GO). We took advantage of the naturally charged property of GO, which were prepared using the Hummers’ method, to pattern it on the Si/SiO2 substrates which were pre-soaked in polyethyleneimine (PEI) solution. The charged GO was spin-coated on the polydimethylsiloxane (PDMS)stamp to achieve maskless patterning by a transfer printing method. The feature sizes of the printed GO patterns obtained range from 20 to 90 μm and the transfer-printed area reaches 2 cm* 2 cm. We also discuss the mechanisms of the transfer process, which are dependent on the different strengths of nonspecific adhesion at the interface between the PDMS-GO sheets and substrate-GO sheets,as well as the electrostatic interaction between charged functional groups on GO and PEI molecules. Raman spectra and mapping
not only show the result of area-selective patterning, but also show the continuity of the GO patterns. Finally, we use this method to fabricate GO patterns on glass substrate and transform these GO patterns to reduced graphene oxide through thermal treatment. |
| 關鍵字： | |
| 著作名稱： | Hierarchical ZnO Nanostructures Growth by Aqueous Solution Process for Dye-Sensitized Solar Cells |
| 年度： | 2012 |
| 類別： |
期刊論文
J. Electrochem. Soc.
|
| 摘要： | Hierarchical high-density well-aligned branched ZnO nanostructures are prepared on conductive glass substrates via a facile strategy with an aqueous solution process. The formation mechanism of ZnO array on a ZnO array is discussed based on the coincident lattice between the trunk and branches. Dye-sensitized solar cells (DSSCs) are fabricated using a well-aligned, high-density, and crystalline array of branched ZnO nanostructures (nanorods (NRs), nanotubes (NTs)) as photoanodes. The ZnO trunks provide fast routes for electron transport to the substrate electrode. The branched ZnO nanotubes (B-ZNTs) DSSCs exhibit an overall efficiency of 0.97%,which is a 52% improvement compared with that obtained for ZnO NRs (ZNRs) DSSCs. The better photovoltaic performance of
hierarchical ZnO nanoarchitecture DSSCs is due to a higher dye loading and light harvesting as a consequence of the enlargement of the internal surface area and optical scattering from the dendritic structure within the photoanode. |
| 關鍵字： | |
| 著作名稱： | Improving the performance of a zinc oxide nanowire ultraviolet photodetector by adding silver nanoparticles |
| 年度： | 2012 |
| 類別： |
期刊論文
J. Electrochem. Soc.
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Patterned Zn-seeds and Selective Growth of ZnO Nanowire Arrays on Transparent Conductive Substrate and Their Field Emission Characteristics |
| 年度： | 2012 |
| 類別： |
期刊論文
Ceram. International
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Patterning of polystyrene thin films by solvent-assisted imprint lithography and controlled dewetting |
| 年度： | 2012 |
| 類別： |
期刊論文
Microelectronic Engineering
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Fabrication of Three-Dimensionally Structured Titanium Oxide Thin Film by Transfer Printing |
| 年度： | 2012 |
| 類別： |
期刊論文
J. Am. Ceram. Soc.,
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Growth Characteristics of Hierarchical ZnO Structures Prepared by One-Step Aqueous Chemical Growth |
| 年度： | 2012 |
| 類別： |
期刊論文
Ceram. International
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. H. Lee, M. H. Hon, Y. W. Chung, and I. C. Leu*, The effect of TiO2 coating on the electrochemical performance of ZnO nanorod as the anode material for lithium-ion battery, Appl. Phys. A, 102 (2011) 545. |
| 年度： | 2011 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | K. L. Lai, M. H. Hon and I. C. Leu*, Fabrication of ordered nanoporous anodic alumina pre-patterned by mold-assisted chemical etching, Nanoscale Research Letters, 6 [1] (2011) 157. |
| 年度： | 2011 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. H. Lee, Y. W. Chung, M. H. Hon, and I. C. Leu*, Fabrication of Tunable Pore Size of Nickel Membranes by Electrodeposition on Colloidal Monolayer Template, J. Alloys and Compounds, 509 (2011) 6528. |
| 年度： | 2011 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. M. Yang, M. H. Hon, and I. C. Leu*, Nanostructured ZnO/conjugated polymer for p-n hetero-junctions, Jpn. J. Appl. Phys., 50 [6] (2011) 06GH05. |
| 年度： | 2011 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | K. L. Lai, M. H. Hon and I. C. Leu*, Pattern formation on polymer resist by solvent-assisted nanoimprinting with PDMS mold as a solvent transport medium, J. Micromech. Microeng., 21 (2011) 075013. |
| 年度： | 2011 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | S. K. Tzeng, M. H. Hon, and I. C. Leu*, Persistent Photoconductivity of Solution-Grown ZnO-based UV Detectors, J. Electrochem. Soc. |
| 年度： | 2011 |
| 類別： |
期刊論文
J. Electrochem. Soc.
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. C. Lee, M. H. Hon, and I. C. Leu*,Template-guided self-ordering of wrinkled ZnO microstructures, Scripta Materialia,62 (2010) 529. (SCI, EI) |
| 年度： | 2010 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | S. K. Tzeng, M. H. Hon, and I. C. Leu*, Improvement in the photocurrent to dark current contrast ratio of ZnO/Au Schottky photodetector with PMMA microlens arrays, J. Electrochem. Soc., 157 [10] (2010) H919. |
| 年度： | 2010 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. M. Chang, M. H. Hon, and I. C. Leu*, Preparation of ZnO nanorod arrays with tailored defect-related characterisitcs and their effect on the ethanol gas sensing performance, Sensors and Actuators B, 151 (2010) 15. |
| 年度： | 2010 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. C. Shen, M. H. Hon, I. C. Leu, L. G. Teoh, Morphological characterization of porous GaP prepared by electrochemical etching, Appl. Phys. A, 98 (2010) 429. |
| 年度： | 2010 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. C. Lee, M. H. Hon, and I. C. Leu*, Self-organization of ZnO wrinkles oriented by patterned PMMA templates, J. Sol-gel Sci. Technol., 56 (2010) 244. |
| 年度： | 2010 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. H. Lee, M. H. Hon, Y. W. Chung, I. C. Leu*, Microcontact Printing of Organic SAMs for Patterned Growth of Well-Aligned ZnO Nanorod Arrays and their Field Emission Properties, J. Am. Ceram. Soc., 92 [10] (2009) 2192. (SCI, EI) |
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. W. Chung, I. C. Leu*, J. H. Lee, and M. H. Hon, Electrophoretic Deposition Kinetics of ZnO nanoparticles into an opal template and fabrication of well-ordered macroporous structure, J. Electrochem. Soc., 156 [6] (2009) E91. (SCI, EI) |
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | I. T. Pai, D. W. Chiou, M. H. Hon and I. C. Leu*, Hierarchical structure formation induced by dewetting in an imprinting process, J. Vac. Sci. Technol. B, accepted, (2009) |
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | S. K. Tzeng, M. H. Hon, and I. C. Leu*, Growth Characteristics of Ultra Long Double-ended Acicular ZnO Synthesized by a Hydrothermal Process, J. Crystal Growth, 311 (2009) 4510. |
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. Y. Kuan, M. H. Hon, J. M. Chou, and I. C. Leu*, Growth Behavior, Microstructure Characterization and Field-emission Property for Sixfold Hierarchical Zn/ZnO Structures Prepared by Direct Annealing, Crystal Growth & Design, 9 [2] (2009) 813. (SCI, EI) |
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. H. Lee, Y. W. Chung, M. H. Hon, and I. C. Leu*, Density-Controlled Growth and Field Emission Property of Aligned ZnO Nanorod Arrays, Appl. Phys. A, 97 [2] (2009) 403. |
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | K. L. Lai, I. C. Leu*, and M. H. Hon, Soft imprint lithography using swelling/ deswelling
characteristics of polymer mold and resist induced by poor solvent, J. Micromech. Microeng., 19 (2009) 037001. (SCI, EI)
|
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. W. Chung, I. C. Leu*, J. H. Lee, and M. H. Hon, Filling behavior of ZnO nanoparticles into opal template via electrophoretic deposition and the fabrication of inverse opal, Electrochimica Acta, 54 (2009) 3677. (SCI, EI) |
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. Y. Kuan, M. H. Hon, J. M. Chou, and I. C. Leu*, Wetting Characteristics on Micro/ nanostructured Zinc Oxide Coatings, J. Electrochem. Soc., 156 [2] (2009) J32. (SCI, EI) (selected for the December 22, 2008 issue of Virtual Journal of Nanoscale Science & Technology) |
| 年度： | 2009 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | K. Y. Yang, I. C. Leu, K. Z. Fung, M. H. Hon, M. C. Hsu, Y. J. Hsiao, and M. C. Wang, Mechanism of the interfacial reaction between cation-deficient La0.56Li0.33TiO3 and metallic lithium at room temperature, J. Mater. Res., 23 [7] (2008) 1813. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. C. Shen, I. C. Leu*, W. H. Lai, M. T. Wu, and M. H. Hon, Varied morphology of porous GaP(111) formed by anodization, J. Alloys and Compounds, 454 (2008) L3–L9 (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. Y. Kuan, J. M. Chou, I. C. Leu*, and M. H. Hon, Self-organized Zn/ZnO core-shelled hierarchical structures prepared by aqueous chemical growth, J. Mater. Res., 23 [4] (2008) 1168. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. Y. Kuan, J. M. Chou, I. C. Leu*, and M. H. Hon, Sixfold Self-Assembled Hierarchical Structures Synthesized by Direct Annealing of Zn Microtips, J .Solid State Chemistry, 181 (2008) 673. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. C. Lee, I. C. Leu*, K. L. Lai and M. H. Hon, Hot embossing by Joule heating, J. Vac. Sci. Tech. B, 26 [1] (2008) 260. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. C. Lee, I. C. Leu*, and M. H. Hon, Growth of ZnO Single Crystals by Annealing Sol–Gel -derived Films with PDMS Pre-pressing, Chem. Lett., 37 [7] (2008) 706. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. H. Lee, I. C. Leu*, Y. W. Chung and M. H. Hon, Morphology-Controlled 2D Ordered Microstructure Arrays by Surface Modification of Colloidal Template. J. Nanosci. Nanotechnol., 8 [9] (2008) 4436. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | I. T. Pai, I. C. Leu*, and M. H. Hon, Hierarchical structure through imprinting of polyimide without residual layers, J. Micromech. Microeng., 18 (2008) 105005. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | S. M. Chou, M. H. Hon, and I. C. Leu*, Synthesis of p-type Al-N codoped ZnO films using N2O as a reactive gas by RF magnetron sputtering, Appl. Surf. Sci., 255 (2008) 2958. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. Y. Kuan, J. M. Chou, I. C. Leu*, and M. H. Hon, Sol-Gel-derived ZnO Coating with Nanopatterns Fabricated by Nanoimprinting, J. Am. Ceram. Soc., 91 [10] (2008) 3160. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | S. M. Chou, M. H. Hon, I. C. Leu*, and Y. H. Lee, Al-doped ZnO/Cu2O Heterojunction Fabricated on (200) and (111)-Orientated Cu2O Substrates, J. Electrochem. Soc., 155 [11] (2008) H923. (SCI, EI) |
| 年度： | 2008 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. H. Lee, I. C. Leu, M. T. Wu, J. H. Yen, and K. Z. Fung, Fabrication of Cu/Cu2O composite nanowire arrays on Si via AAO template-mediated electrodeposition, J. Alloys and Compounds, 427 (2007) 213. (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. W. Chung, I. C. Leu*, J. H. Lee, and M. H. Hon, Effect of heating rate on the fabrication of tunable ordered macroporous structures mediated by colloidal crystal template, J. Alloys and Compounds, 433 (2007) 345 (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. H. Lee, I. C. Leu, C. L. Liao, and K. Z. Fung, The structural evolution and electrochemical properties of the textured Cu2O thin films, J. Alloys and Compounds, 436 (2007) 241 (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C.L. Liao, C.W. Chu, K.Z. Fung and I.C. Leu, Fabrication of nanoporous metal electrode by two-step replication technique, J. Alloys and Compounds, 441 [1-2] (2007) L1. (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | K. Y. Yang, K. Z. Fung and I. C. Leu, Study on the structural change and lithium ion conductivity for the perovskite-type LaAlO3–La0.50Li0.50TiO3 solid solution, J. Alloys and Compounds, 438 [1-2] (2007) 207. (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | M. C. Hsu, Y. M. Sun, I. C. Leu, and M. H. Hon, Microstructural and compositional studies of liquid-phase deposition derived PbTiO3 thin films on LaNiO3 substrates, Appl. Surf. Sci., 253 (2007) 7639. (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. W. Chung, I. C. Leu*, J. H. Lee, J. H. Yen, and M. H. Hon, Fabrication of egg-shell-roofed macroporous nickel films by a template-mediated electrodeposition process, Electrochimica Acta, 53 (2007) 1703. (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. Y. Kuan, J. M. Chou, I. C. Leu*, and M. H. Hon, Formation and field emission property of single-crystalline Zn microtip arrays by anodization, Electrochemistry Communication, 9 (2007) 2093. (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. W. Chung, I. C. Leu*, J. H. Lee, and M. H. Hon, Fabrication of various nickel nanostructures by manipulating one-step electrodeposition process, J. Electrochem. Soc., 154 [6] (2007) E77. (SCI, EI) |
| 年度： | 2007 |
| 類別： |
期刊論文
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. W. Chung, I. C. Leu*, J. H. Lee, and M. H. Hon, Influence of humidity on the fabrication of high-quality colloidal crystals via a capillary-enhanced process |
| 年度： | 2006 |
| 類別： |
期刊論文
Langmuir
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | J. H. Lee, I. C. Leu*, M. C. Hsu, Y. W. Chung and M. H. Hon, Fabrication of ordered ZnO hierarchical structures controlled via surface-charge in electrophoretic deposition process, Nanotechnology, 17 (2006) 4445. |
| 年度： | 2006 |
| 類別： |
期刊論文
Nanotechnology
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. C. Lin, I. C. Leu*, J. H. Yen and M. H. Hon, Spatially oriented carbon nanofibers manipulated by a hollow cathode discharge process, Nanotechnology, 17 (2006) 4352. |
| 年度： | 2006 |
| 類別： |
期刊論文
Nanotechnology
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | I. T. Pai, I. C. Leu*, and M. H. Hon, Nanostructures prepared on polyimide films by nanoimprinting with the assistance of residual solvent, J. Micromech. Microeng., 16 (2006) 2192. |
| 年度： | 2006 |
| 類別： |
期刊論文
J. Micromech. Microeng.
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. W. Chung, I. C. Leu*, J. H. Lee, and M. H. Hon, Fabrication and characterization of core-shell photonic crystals via a dipping process, Colloids and Surfaces A, 290 (2006) 256. |
| 年度： | 2006 |
| 類別： |
期刊論文
Colloids and Surfaces A
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | M. C. Hsu, Y. M. Sun, I. C. Leu, and M. H. Hon, Structural and Electrical Characterizations of PbTiO3 Thin Films Grown on LaNiO3-Buffered Pt/Ti/SiO2/Si Substrates by Liquid Phase Deposition, J. Electrochem. Soc., 153 [11] (2006) F260. |
| 年度： | 2006 |
| 類別： |
期刊論文
J. Electrochem. Soc.
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | M. C. Hsu, I. C. Leu, Y. M. Sun, and M. H. Hon, Template synthesis and characterization of PbTiO3 nanowire arrays from aqueous solution, J. Solid State Chem., 179 (2006) 1421. |
| 年度： | 2006 |
| 類別： |
期刊論文
J. Solid State Chem.,
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | C. L. Liao, M. T. Wu, J. H. Yen, I. C. Leu and K. Z. Fung , Preparation of RF-sputtered lithium cobalt oxide nanorods by using porous anodic alumina (PAA) template, J. Alloys and Compounds, 414 (2006) 302. |
| 年度： | 2006 |
| 類別： |
期刊論文
J. Alloys and Compounds
|
| 摘要： | |
| 關鍵字： | |
| 著作名稱： | Y. H. Lee, I. C. Leu, C. L. Liao, S. T. Chang, M. T. Wu, J. H. Yen, and K. Z. Fung, Fabrication and Characterization of Cu2O Nanorod Arrays and Their Electrochemical Performance in Li-Ion Batteries, Electrochem. Solid-State Lett., 9 [4] (2006) A207. |
| 年度： | 2006 |
| 類別： |
期刊論文
Electrochem. Solid-State Lett.
|
| 摘要： | |
| 關鍵字： | |