Academic literature on the topic 'Au/WO3'
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Journal articles on the topic "Au/WO3"
Xue, Dongping, and Zhanying Zhang. "Au-sensitized WO3 nanoparticles synthesized and their enhanced acetone sensing properties." Functional Materials Letters 11, no. 04 (August 2018): 1850071. http://dx.doi.org/10.1142/s1793604718500716.
Full textMinggu, Lorna Jeffery, Nurul Akmal Jaafar, Kim Hang Ng, Khuzaimah Arifin, and Rozan Mohamad Yunus. "Electrodeposited WO3/Au Photoanodes for Photoelectrochemical Reactions." Sains Malaysiana 49, no. 12 (December 31, 2020): 3155–63. http://dx.doi.org/10.17576/jsm-2020-4912-27.
Full textJeffery Minggu, Lorna, Nurul Akmal Jaafar, Kim Hang Ng, Khuzaimah Arifin, and Rozan Mohamad Yunus. "Electrodeposited WO3/Au Photoanodes for Photoelectrochemical Reactions." Sains Malaysiana 49, no. 12 (December 31, 2020): 3209–17. http://dx.doi.org/10.17576/jsm-2020-4912-32.
Full textFigueiredo, Nuno M., Filipe Vaz, Luís Cunha, and Albano Cavaleiro. "Au-WO3 Nanocomposite Coatings for Localized Surface Plasmon Resonance Sensing." Materials 13, no. 1 (January 6, 2020): 246. http://dx.doi.org/10.3390/ma13010246.
Full textPaliwal, Ayushi, Monika Tomar, and Vinay Gupta. "Thickness Dependent Optical Properties of WO3 Thin Film using Surface Plasmon Resonance." MRS Proceedings 1494 (2013): 233–38. http://dx.doi.org/10.1557/opl.2013.137.
Full textSzékely, István, Zoltán Kovács, Mihai Rusu, Tamás Gyulavári, Milica Todea, Monica Focșan, Monica Baia, and Zsolt Pap. "Tungsten Oxide Morphology-Dependent Au/TiO2/WO3 Heterostructures with Applications in Heterogenous Photocatalysis and Surface-Enhanced Raman Spectroscopy." Catalysts 13, no. 6 (June 17, 2023): 1015. http://dx.doi.org/10.3390/catal13061015.
Full textYoo, Ran, Hyun-Sook Lee, Wonkyung Kim, Yunji Park, Aran Koo, Sang-Hyun Jin, Thang Viet Pham, Myung Jong Kim, Sunglyul Maeng, and Wooyoung Lee. "Selective Detection of Nitrogen-Containing Compound Gases." Sensors 19, no. 16 (August 15, 2019): 3565. http://dx.doi.org/10.3390/s19163565.
Full textLamichhane, Shiva, Savita Sharma, Monika Tomar, and Arijit Chowdhuri. "Effect of variation in glancing angle deposition on resistive switching property of WO3 thin films for RRAM devices." Journal of Applied Physics 132, no. 13 (October 7, 2022): 134102. http://dx.doi.org/10.1063/5.0103236.
Full textFauzi, Aynul Sakinah Ahmad, Nur Laila Hamidah, Shota Kitamura, Taiga Kodama, Kosuke Sonda, Ghina Kifayah Putri, Takeshi Shinkai, et al. "Electrochemical Detection of Ethanol in Air Using Graphene Oxide Nanosheets Combined with Au-WO3." Sensors 22, no. 9 (April 21, 2022): 3194. http://dx.doi.org/10.3390/s22093194.
Full textBalázsi, Csaba, Radu Ionescu, and Katarína Sedlácková. "Hexagonal WO3 Films with Carbon Nanotubes for Sensing Applications." Materials Science Forum 589 (June 2008): 67–71. http://dx.doi.org/10.4028/www.scientific.net/msf.589.67.
Full textDissertations / Theses on the topic "Au/WO3"
Al, Mohammad Ahmad. "Structure et morphologie des surfaces d'Al2O3α et des films minces WO3 : application à leurs interactions avec Au." Aix-Marseille 3, 2001. http://www.theses.fr/2001AIX30011.
Full textThis work concerns the study of the oxyde surfaces (preparation, structure, morphology) and their interaction with metallic deposit (granulometry and reactivity). The oxide surfaces which were used are the alumina surfaces and tungsten oxide. We prepared and characterized the crystallographic structure of the substrate surfaces by RHEED, AFM, and AES techniques. We studied the growth of gold deposit on these various surfaces. We studied the influence of the surface atomic structure on the gold deposit growth and investigated the interactions between the surface and the gold atoms. For that we examined gold deposits of various thicknesses, deposited at various temperatures on stoichiometric or reduced surfaces (1012 ) and (0001) of alumina. .
Qadri, Muhammad Usman. "Tungsten oxide nanostructures and thin films for optical gas sensors." Doctoral thesis, Universitat Rovira i Virgili, 2014. http://hdl.handle.net/10803/279291.
Full textEn esta tesis doctoral se han investigados capas delgadas i nanoestructuras de WO3 para el sensado óptico de gases. Se han relaizado estudios de las síntesis de materiales nanoestructurados, la posible fabricación del dispositivo y las propiedades para la detección de gases. Se han investigado capas delgadas de WO3 con unos grosores cercanos a 550 nm, crecidas mediante pulverización catódica de radiofrecuencia. Dichas capas fueron dopadas con nanopartículas de Pt y se estudiaron sus propiedades para el sensado óptico de gases como el H2, Co y NOx. Estas capas mostraron un respuesta y recupèración rápidas bajo la influencia de los gases mencionados anteriormente. Las capas no dopadas de WO3 mustran una respuesta óptica mediable al NOx mientras que las dopadas con Pt muestran repsuesta al H2 a temperatura ambiente. De manera similar, la respuesta gasocrómica de nanoagujas de WO3 decoardas con nanopartículas de Pt y Au muestran una respuesta óptica a temperatura ambiente cuando se exponen a NH3. Por primera vez y en esta tesis se reporta la respuesta óptica del WO3 a temperatura ambiente. Finalmente y de manera similar a las capas delgadas, los tiempos de respuesta y recuperación de las nanoagujas de WO3 es rápido y del orden de segundos. En resumen, la investigtación que se ha desarrollado en esta tesis ha cumplido los objetivos de desarrollar sensores ópticos basados en nanomateriales de WO3. Se ha implementado la detección de NH3, CO, NOx y H2. de forma exitosa. Basandonos en estos resultados podemos concluir que el WO3 representa un buen material candiudato a ser integrado en futuros dispositivos ópticos para el sensado de gases.
n this doctoral thesis, WO3 based thin films and nanostructures have been investigated for optical gas sensing. The nano structured material synthesis, device fabrication and their gas sensing properties have been studied. WO3 thin films with thicknesses around 550 nm, grown by RF sputtering have been investigated for optical gas sensing using absorbance spectroscopy. These films were doped with Pt nanoparticles and subjected to optical gas sensing under the influence of H2, CO and NOx. These films showed fast response and recovery under the influence of mentioned gases. The response and recovery time is in the range of seconds. The bare WO3 films show a measureable optical response to NOx. The films doped with Pt nanoparticles show a response to H2 at room temperature. Similarly, the gasochromic response of WO3 nanoneedles was investigated upon the exposure to NH3. The nanoneedles decorated with Au and Pt show optical response when exposed to NH3 gas at room temperature. The optical response at room temperature of these nanoneedles is presented in this doctoral thesis for the first time. Similarly to thin films, nanoneedles have also shown a fast response and recovery time in the range of seconds. In summary, this PhD research program successfully fulfilled its objectives to investigate and develop novel WO3 optical sensors based on nanostructures and thin films. During the work the author has successfully employed this material for optically sensing the mentioned gases such as NH3, CO, NOx, and H2. The evaluation of these results indicates that WO3 is a good candidate for designing future devices for optical gas sensing.
Chambrier, Marie-Hélène. "Analyse structurale au sein du diagramme de phase de La2O3-WO3 et exploration des propriétés de conduction ionique." Le Mans, 2009. http://cyberdoc.univ-lemans.fr/theses/2009/2009LEMA1018.pdf.
Full textThe aim of this work deals with the structural exploration of the La2O3-WO3 phase diagram. Indeed, like many phase diagrams, La2O3-WO3 was built in the 70s, but definite compounds structures were not determined and are still unknown. This thesis focus on La2WO6, La18W10O57, La6W2O15 and La10W2O21. These compounds are synthesized as powder by solid state reaction and characterized by X-ray, neutron powder diffraction, gravimetric and differential thermal analysis, T. E. M. And 139La N. M. R. . The structure of the low temperature form named ß-La2WO6 has been determined from laboratory X-ray diffractometer, neutron (T. O. F) and electronic diffraction data. This tungstate crystallizes in a non-centrosymetric orthorhombic space group (n°19) P212121 Z = 8, a = 7,5196(1) Å, b = 10,3476(1) Å, c = 12,7944(2) Å. La18W10O57 which presents 52. 65 WO3 mol% in the binary system La2O3-WO3 in place of the previous reported compound: La14W8O45 53. 3 WO3 mol%. The structure has been determined from synchrotron and laboratory X-ray, neutron, and electron diffraction data. This tungstate crystallizes in the non-centrosymmetric hexagonal space group (n°190) P-62c , with Z = 2, a = 9. 0448(1)Å, c= 32. 6846(3)Å. This compound presents a sub cell c’=c/6= 5. 45Å. Polytypism have been observed concerning this compound by transmission electronic microscopy, ionic conductivity and thermal expansion have been explored. For the 3 allotropic La6W2O15 forms, a structural relation have been established. The a and ß form are solved. The crystal structure of La10W2O21, which has to be reformulated (La5. 667W0. 333)LaWO14??2, is best described, on average, by a 2 x 2 x 2 anion-deficient fluorite-related superstructure cubic cell, space group F 4 3m, Z = 4, a = 11. 17932(6) Å. The La/W mixed site is nicely confirmed by 139La NMR. This compound exibits an interesting fast oxide-ion conducting properties, comparable with LAMOX at low temperature. Different from many ionics conductors, we don’t notice any temperature structural transition. Its conductivity is about 6. 4×10-4 S. Cm-1 at 700°C
Davazoglou, Dimitrios. "Caractérisation de couches minces de WO3 préparées par CVD étude de l'effet électrochrome au sein de ces couches /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37604310g.
Full textAbdellaoui, Ahmed. "Étude de l'effet électrochrome au sein des couches minces de MoO3 et WO3 préparées par CVD : Chemical Vapor Deposit." Montpellier 2, 1989. http://www.theses.fr/1989MON20070.
Full textGiraud, Francois. "Approche par la microcinétique expérimentale du procédé NH3-SCR sur catalyseurs V2O5-WO3/TiO2 modèles et industriels." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10241/document.
Full textThe aim of the study is to obtain an equation for the overall reaction rate of the NH3-SCR reaction over V2O5/WO3/TiO2 catalysts (a) used for the experimental conditions (partial pressure of components of the gas mixture and temperature) realistic conditions of discharges from coal power plant and (b) able to take into account the chemical poisoning effects of the catalyst. This equation will be implemented in software developed by EDF for modeling the evolution of the performance of industrial catalysts. To fulfill these objectives, tools and procedures for the experimental microkinetic approach were applied. The characterization of the first key step of the reagent adsorbed NH3 on the surface of catalyst (type adsorption, heats of adsorption of each species) has necessitated the development of the AEIR method (initially adapted to the characterization of CO adsorbed on metal particles). The reactivity of the NH3 adsorbed species to the various reagents (H2O, NOx, and O2) was then studied, leading to the development of plausible kinetic mechanism. From this mechanism, a kinetic model of the NH3-SCR reaction has been developed and compared to experimental data obtained on model and commercial catalysts. In the remainder of the study, the impacts of several poisons to parameters that control the kinetics of the reaction were determined experimentally. In the last part, a model of catalytic monoliths performances was developed (by integrating the kinetic model developed in this study) and compared to experimental data
Chiu, Yungchun, and 邱詠竣. "Study of ozone sensing by using Au/TiO2-WO3 materials." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/54602757828492264779.
Full text靜宜大學
應用化學系
100
Exploring the reaction between materials and ozone in this study by observing the changes in resistance on the surface of the photocatalyst material when ozone adsorb. The material is TiO2-WO3 composites. TiO2 and WO3 are common metal oxide semiconductors. When they were radiated by light source with specific wavelength and absorb the energy to stimulate the electron from conduction band and holes occur in the valence band. The energy to excit electrons of materials are the band gaps, the band gap of TiO2 and WO3 are 3.2 eV and 2.6 eV,respectively. But, electrons and holes may recombine and reduce the photocatalytic effect. Aadding the noble metal Au to help the electron transfer, and reduce the probability of recombination of electrons and holes. In this study, Au/TiO2-WO3 photocatalyst material is prepared by impregnation. Add the coated agent to attach photocatalyst materials on an alumina substrate with screen printing gold electrodes, after drying and 400 ° C calcination the sensor prepare completely. The preparation method is simple and cheap. Experiment in a concentration of 2.5 ppm of ozone, UV (365nm) light source as a test to identify the TiO2 and WO3 in which proportion is the best. Further small addition of Au to enhance the sensor response. The best ratio 0.1% Au/TiO2-WO3 (3:1) composite excitation in the visible region (blue light whit wavelength 465nm), the sensor response is 64. LED blue light instead of ultraviolet light, can effectively reduce costs. Using TEM, XRD and TPR for qualitative analysis.
HUANG, WEI-RU, and 黃韋儒. "Prepared Pd-Au/TiO2-WO3 Nanoparticle Applied in Photoreduction of CO2 into CO and CH4." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/jtvh68.
Full text靜宜大學
應用化學系
106
This study presents Pd-Au/TiO2-WO3 nanoparticle prepared by a hydrothermal and sol-gel method as a CO2 conversion photocatalysts. The catalysts were characterized by X-ray diffraction (XRD), Scan electron microscope (SEM), Tunneling electron microscope (TEM), XPS, BET, UV-visible and Photoluminescence (PL) instruments. The appropriate amounts of Pd and Au on TiO2-WO3 composites exhibited enhanced photocatalytic activity for CO2 reduction compared with commercial TiO2 (P25). It showed the photocatalytic CH4 production rate (39.1 μmol g-1 h-1) was 100 fold that of TiO2 (P25); moreover, a large amount of CO was produced (at a rate of 271.3 μmol g-1 h-1) was 300 fold that of TiO2 (P25). The significantly improved photocatalytic activity was not only due to the increased specific surface area (72.9 m2g-1) but also UV-vis showed a remarkable enhancement of light absorption. It owes to the incorporation Pd-Au with TiO2 the visiblelight active the UV light-responsive for increased solar energy utilization. Furthermore, PL spectra revealed that the Pd-Au content can influence the charge transfer efficiency of the Pd-Au/TiO2-WO3 composites. The quantum yield of CH4 production was calculated as 1.05 %. A CO2 reduction reaction mechanism was proposed on Pd-Au/TiO2-WO3. This study can bring new insights into designing TiO2 nanostructures for applications such as solar energy conversion and storage.
Liu, Ying, and 劉穎. "Fabrication of WO3 photoanode decorated with Au nanoplates and its applications in photoelectrochemical water splitting." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/vfzn6w.
Full text國立臺灣大學
材料科學與工程學研究所
107
In the present work, we improved the photoelectrochemical (PEC) performance of tungsten trioxide (WO3) photoanode by decorating WO3 film with Au nanoplates. WO3 films were fabricated on FTO-coated glass by hydrothermal treatment and Au nanoplates were incorporated by immersing the substrates in Au nanoplates solution under different periods of time. Our study revealed that compared with pristine WO3, the Au-WO3 nanocomposite performed enhanced photocurrent density under irradiation of AM 1.5G simulated sunlight. This improved PEC performance was benefited from the extension of light absorption resulting from the surface plasmon resonance effect of the Au nanoplates at about 650 nm wavelength, which was verified by UV-vis absorption spectra. The incident photon-to-current conversion efficiency measurements revealed that photoactivity was improved after decoration of Au nanoplates on WO3. This study provided a facile method to decorate Au nanoplates on WO3 photoanodes with enhanced performance for solar energy conversion.
LIAO, WEI-HUA, and 廖偉華. "Influence of Au NPs and K+ ion doping on the electrical and humidity-sensing properties of Au NPs- or K+ ion-doped WO3 nanoparticles." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/fq9nhy.
Full text中國文化大學
化學系應用化學碩士班
105
Impedance-type humidity sensors made of WO3 nanoparticles (WO3 NPs) that was added with KOH or Au nanoparticles (Au NPs). The humidity-sensing (sensitivity and linearity) and electrical properties of the WO3 NPs was improved and investigated by adding with KOH and Au NPs. Adsorption dynamic analysis and molecular mechanical calculations were used to elucidate that the sensitivity of K+ ion-added WO3 NPs was higher than that of Au NPs-added WO3 NPs. The sensor that was made of the K+ ion-doped WO3 NPs layer exhibited favorable impedance, high sensitivity, good linearity, small hysteresis, a short response/recovery time and high long-term stability over the humidity range studied. Complex impedance spectra were used to investigate the humidity-sensing mechanism of the K+ ion-added WO3 NPs layer. Keywords: Humidity sensor; WO3 nanoparticles; ion; Au NPs; Adsorption dynamic analysis; Complex impedance spectra.
Book chapters on the topic "Au/WO3"
Mao, Jingwen, Hegen Ouyang, Shiwei Song, M. Santosh, Shunda Yuan, Zhenhua Zhou, Wei Zheng, et al. "Chapter 10 Geology and Metallogeny of Tungsten and Tin Deposits in China." In Mineral Deposits of China, 411–82. Society of Economic Geologists, 2019. http://dx.doi.org/10.5382/sp.22.10.
Full textConference papers on the topic "Au/WO3"
Ramgir, Niranjan S., S. Kailasa Ganapati, N. Datta, M. Kaur, A. K. Debnath, D. K. Aswal, and S. K. Gupta. "Opposite response of CO for WO3 and Au: WO3 sensors." In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710185.
Full textHoel, Anders, Jesper Ederth, Peter Heszler, Laszlo B. Kish, Eva Olsson, and Claes-Goeran Granqvist. "Invasion noise in nanoparticle WO3/Au thin film devices." In International Symposium on Microelectronics and MEMS, edited by Laszlo B. Kish, Erol C. Harvey, and William B. Spillman, Jr. SPIE, 2001. http://dx.doi.org/10.1117/12.454608.
Full textYang, Dongfang, Bo Chen, Suwas Nikumb, Chun-Hsien Chang, and Chii-Wann Lin. "Surface Plasmon Resonance Gas Sensors Using Au-WO3-x Nanocomposite Films." In 2008 Second International Conference on Sensor Technologies and Applications (sensorcomm 2008). IEEE, 2008. http://dx.doi.org/10.1109/sensorcomm.2008.29.
Full textJaafar, N. A., L. J. Minggu, and M. B. Kassim. "Photoelectrochemical Activity of WO3/Au in Aqueous Electrolyte with Addition of Methanol." In 3rd IET International Conference on Clean Energy and Technology (CEAT) 2014. Institution of Engineering and Technology, 2014. http://dx.doi.org/10.1049/cp.2014.1461.
Full textPunginsang, M., C. Liewhiran, A. Wisitsoraat, S. Phanichphant, D. Zappa, E. Comini, G. Sberveglieri, and A. Ponzoni. "P2NG.5 - Selective H2S Gas Sensors Based on Au-functionalized WO3 Nanowires." In 17th International Meeting on Chemical Sensors - IMCS 2018. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2018. http://dx.doi.org/10.5162/imcs2018/p2ng.5.
Full textGarcia-Llamas, R., and Luis E. Regalado. "Effects of Rough Interfaces in a Thin-Film." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/oic.1995.tha8.
Full textDey, Anup, Bikram Biswas, and Subir Kumar Sarkar. "Comparative Study of Unmodified WO3-ZnO and Au-Modified WO3-ZnO Based Thin Film Sensor Fabrication for Enhanced CH4 Gas Sensing Performance." In 2018 IEEE Electron Devices Kolkata Conference (EDKCON). IEEE, 2018. http://dx.doi.org/10.1109/edkcon.2018.8770222.
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