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Dissertations / Theses on the topic 'Tungsten trioxide'

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Published: 4 June 2021
Last updated: 26 July 2025

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1

Garner, Sally Elizabeth. "Ion insertion in tungsten trioxide electrodes." Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/30079.

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The role of ion insertion into the electrochromic metal oxide WO3 has been studied using a combination of electrochemical, gravimetric and spectroscopic techniques. The electrochemical quartz crystal microbalance (EQCM) was used to investigate the effect of electrolyte composition by studying the identity of the cations and anions involved and the concentration of the electrolyte used. It was found that the effect of electrolyte concentration and choice of anion did not affect film reduction and re-oxidation. The two cations studied, Li- and Na+, however cause marked differences in film redox
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2

Shen, Peikang. "A study of modified tungsten trioxide electrodes." Thesis, University of Essex, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315727.

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3

Reyes, Hernández Luis Fernando. "Tungsten trioxide nanocrystalline films for applications in gas sensors." Universidad Nacional de Ingeniería. Programa Cybertesis PERÚ, 2008. http://cybertesis.uni.edu.pe/uni/2008/reyes_hl/html/index-frames.html.

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4

Stewart, Laine Kincaid. "Tungsten trioxide and titanium dioxide photocatalytic degradations of quinoline." [Ames, Iowa : Iowa State University], 2009.

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5

Ma, Shuguo. "Reactions of Alcohols and Organophosphonates on Tungsten Trioxide Epitaxial Films." Fogler Library, University of Maine, 2003. http://www.library.umaine.edu/theses/pdf/MaS2003.pdf.

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6

Johansson, Malin. "Nanocrystalline Tungsten Trioxide Thin Films : Structural, Optical and Electronic Characterization." Doctoral thesis, Uppsala universitet, Fasta tillståndets fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-211855.

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This thesis concerns experimental studies of nanocrystalline tungsten trioxide thin films. Functional properties of WO3 have interesting applications in research areas connected to energy efficiency and green nanotechnology. The studies in this thesis are focused on characterization of fundamental electronic and optical properties in the semiconducting transition metal oxide WO3. The thesis includes also applied studies of photocatalytic and photoelectrochemical properties of the material.     All nanocrystalline WO3 thin films were prepared using DC magnetron sputtering. It was found that str
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7

Patel, K. J., G. G. Bhatt, J. R. Ray, et al. "Thickness-dependent electrochromic properties of amorphous tungsten trioxide thin films." Thesis, Jadavpur University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65503.

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Tungsten Trioxide (WO3) thin films were grown by thermal evaporation method to study the effect of film’s thickness on its electrochromic (EC) properties. The WO3thin films of different thicknesses were grown on Indium Tin Oxide (ITO) coated glass and soda lime (bare) glass substrate held at room temperature. The surface composition of the thin films was investigated using X-ray photoelectron spectroscopy measurement, which showed the oxygen to tungsten atomic composition ratio to be nearly 2.97. The EC properties of the thin films were examined using electrochemical techniques. Cyclic-v
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8

Verbrugghe, Nathalie. "Lithographie optique, dépôts de films minces de tungstène et trioxyde de tungstène dédiés aux capteurs de gaz semiconducteurs." Thesis, Littoral, 2019. http://www.theses.fr/2019DUNK0527/document.

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Porté par les préoccupations actuelles en matière de sécurité et de qualité environnementale ainsi que par les efforts de recherche entrepris dans ce domaine, le marché mondial des capteurs de gaz est en pleine expansion. Dans le contexte de la commercialisation d'un capteur de gaz, une phase d'amélioration de ses performances, et notamment de sa sensibilité et de sa stabilité, est naturellement nécessaire. Cependant, il s'avère également pertinent d'envisager d'en diminuer le coût de fabrication. Pour cela, il convient de développer une technologie utilisant d'une part des matériaux bas coût
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9

Angeletti, Andrea. "Electronic properties of the WO2 (001) polar surface of tungsten trioxide." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23141/.

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Tungsten trioxide WO3 shows promising perspectives in many fields of research. Surface states appear to play a fundamental role on the overall functionality of the material. Experimental evidences showed the capability to consistently obtain meta-stable polar surfaces, characterized by large amount of excess charge on the surface. In this study, we investigate the WO2 terminated polar (001) surface, by density functional theory calculations. Our data suggest a tri-dimensional nature of the excess electrons, delocalized across the entire slab, compared to the usually observed two-dimensional el
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10

Vallejos, Vargas Stella. "Study of Structural and Sensing Properties of Tungsten Trioxide Thin Films Deposited By RF Sputtering." Doctoral thesis, Universitat Rovira i Virgili, 2008. http://hdl.handle.net/10803/8461.

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Hoy en día la habilidad de producir capas de óxidos metálicos compuestos por nanogranos es muy importante, no sólo como conocimiento fundamental, sino también desde un punto de vista industrial debido a las numerosas aplicaciones de los óxidos metálicos nanoesctructurados en varios dispositivos electrónicos. Por ejemplo, en el campo de los sensores de gas, la relación superficie-volumen de las capas basadas en nanogranos de óxidos metálicos, ofrece la posibilidad de mejorar las propiedades de detección de estos dispositivos. Por esta razón, una gran fracción del total de la investigación y des
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11

Ramzan, Mohammed. "Characterization of electroceramics using impedance spectroscopy : photochromic tungsten trioxide (WO₃₋x) materials for sensor applications." Thesis, University of Leeds, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400156.

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12

Favard, Alexandre. "Multicapteurs intégrés pour la détection des BTEX." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0123/document.

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La qualité de l’air extérieur (QAE) a fait l’objet d’une législation dès 1996 avec la loi LAURE. Depuis 2008, la directive européenne 2008/50/CE a instauré des obligations de mesure et de seuils à ne pas dépasser pour certains polluants à l’échelle européenne. Selon de nombreuses données toxicologiques et épidémiologiques, la pollution de l’air est à l’origine d’insuffisances respiratoires, d’asthme, de maladies cardiovasculaires et de cancers.Les composés organiques volatils (COV) et notamment le benzène, le toluène, l’ethylbenzène et les xylènes (les composés BTEX) sont des polluants avérés
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13

Ostachavičiūtė, Simona. "WO3, Se-WO3 ir TiO2/WO3 fotokatalizatorių sintezė, struktūra ir aktyvumas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2015. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20150109_130956-82196.

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Pasaulyje neslopsta susidomėjimas fotokataliziniais procesais, kuriuos siekiama pritaikyti vandens skaidymo į vandenilį ir deguonį, organinių ar neorganinių junginių nukenksminimo technologijose. Fotoelektrocheminis vandens skaidymas į elementus vertinamas kaip vienas perspektyviausių būdų, galinčių ateityje užtikrinti efektyvų atsinaujinančių energijos šaltinių panaudojimą. Kuriant fotokatalizines sistemas, nanostruktūrinis titano dioksidas (TiO2) išlieka viena tinkamiausių ir labiausiai tyrinėtų medžiagų. Tačiau titano dioksidas neaktyvus regimosios spinduliuotės srityje, todėl alternatyva T
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Favard, Alexandre. "Multicapteurs intégrés pour la détection des BTEX." Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0123.

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La qualité de l’air extérieur (QAE) a fait l’objet d’une législation dès 1996 avec la loi LAURE. Depuis 2008, la directive européenne 2008/50/CE a instauré des obligations de mesure et de seuils à ne pas dépasser pour certains polluants à l’échelle européenne. Selon de nombreuses données toxicologiques et épidémiologiques, la pollution de l’air est à l’origine d’insuffisances respiratoires, d’asthme, de maladies cardiovasculaires et de cancers.Les composés organiques volatils (COV) et notamment le benzène, le toluène, l’ethylbenzène et les xylènes (les composés BTEX) sont des polluants avérés
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15

Hesková, Helena. "Příprava a charakterizace fotoanod s oxidem wolframovým." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414081.

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This work deals with the optimization of the preparation process of WO3 photoanodes nad their characterization. For compositions were prepared, which were applied to a substrate via spin-coating process and subsequently annealed at 450 °C. The length of milling of precursor particles contained in the coating formulations determined properties of deposited layers. were examined for. The additivity of the individual compositions was also observed. The structure of the layers was observed by optical microscopy and scanning electron microscopy (SEM), their composition by the X-ray diffraction (XRD
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16

Yang, Xiaojiao. "Synthesis and Characterization of Hybrid Metal-Metallic Oxide Composite Nanofibers by Electrospinning and Their Applications." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1022/document.

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Nous présentons dans ce manuscrit l'élaboration par électrofilage (ES) de nanofibres hybrides métal/oxyde métallique (HMMOC) et leurs caractérisations physico-chimiques. Leurs utilisations dans le cadre d’applications de type « énergie » et « environnement » ont été évaluées. En particulier, la photocatalyse de nanofibres TiO2-Au pour la dégradation en solution aqueuse du bleu de méthylène et l’utilisation de nanofibres WO3-Au comme capteurs de gaz (VOCs) ont été examinées. En lien étroit avec les résultats obtenus sur l'évaluation des performances comme photocatalyseurs ou capteurs à gaz de c
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17

Hoel, Anders. "Electrical Properties of Nanocrystalline WO3 for Gas Sensing Applications." Doctoral thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4051.

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Tungsten trioxide is a material with a variety of application areas. For example, the material is used within thin film technologies as electrochromic material in smart windows, as electrochemically functional material in thermal control applications or as active layer in gas sensing application. Metal-oxide semiconductor gas sensors are of significant interest to detect toxic and hazardous gases. The use of small and cheep sensors is preferable since a large number of sensors easily can be placed at different sites to monitor the concentration of different species without involving huge inves
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18

Hoel, Anders. "Electrical Properties of Nanocrystalline WO3 for Gas Sensing Applications." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4051.

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19

Filipská, Markéta. "Vrstvy oxidu wolframového připravené z nanočásticových suspenzí a pojiva." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449339.

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This diploma thesis deals with layers of tungsten oxide, which are prepared from a nanoparticle suspension and a binder. The coating composition consisted in the first case of ground tungsten oxide nanoparticles alone, then of acetylated peroxotungstic acid alone and finally of a mixture of ground tungsten oxide mixed with acetylated peroxotungstic acid. The compositions thus formed were applied to conductive FTO glass and thus act as photoanodes. A stainless steel needle is used as a counter electrode for volt-ampere measurements. The work focuses on the study of physicochemical properties of
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20

Saadi, Lama. "Etude de l'adsorption des molécules simples sur WO3 : application à la détection des gaz." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4346/document.

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L'équipe micro-capteurs de l'IM2NP développe des capteursde gaz dont le principe de détection est basé sur la mesure de la variationde la conductance en présence de gaz. Le matériau utilisé comme élémentsensible est l'oxyde de tungstène (WO3) en couches minces. L'objet de cettethèse est donc d'étudier la surface de WO3 dans sa reconstruction c(2x2),obtenue par clivage selon la direction [001]. Cette étude a été également suivied'une étude des lacunes par des calculs ab initio basés sur la DFT, dans lesdeux approximations LDA et GGA. Ensuite, l'dsorption de molécules de gazsimples (O3, COx, NOx
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21

Koutiri, Issam. "Etude ab initio du trioxyde de tungstène WO3 en volume et en surface." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00866593.

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Nous avons étudié par calcul ab initio la structure et la stabilité de différentes phases cristallographiques du trioxyde de tungstène en volume et ensurface, ainsi que l'effet du dopage par le potassium. L'étude a été motivéepar des travaux expérimentaux sur la croissance de nano-bâtonnets WO3 surun substrat de mica ; ces nanostructures adoptent la phase hexagonale, mé-tastable dans le WO3 massif. La première partie du manuscrit est consacrée àl'étude du volume. Les structures atomiques des phases hexagonales et monocliniquessont déterminées et comparées aux différents modèles proposés dansla
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22

Papák, Jiří. "Tištěný fotolektrochemický senzor modrého světla." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414088.

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This diploma thesis focuses on electrochemical sensors to detect radiation in the blue region of the visible spectrum. As a semiconducting material for the manufacture of the sensor, a suspension of tungsten trioxide was found. The individual elements of the sensor were applied by pad printing techniques or screen printing. Using linear voltammetry and chronoamperometry, the magnitude of the generated current was measured and radiometric calibration was performed. The properties of the layers were characterized by profilometry, optical and electron microscopy.
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23

Falaras, Polycarpos. "Étude des propriétés électrochromes des films anodiques de trioxyde de tungstène." Paris 6, 1986. http://www.theses.fr/1986PA066206.

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Étude de l'absorption qui apparait dans ce matériau au cours de sa coloration et des possibilités d'utilisation pour la réalisation des systèmes d'affichage. On montre que les couches formées par oxydation anodique présentent une cristallisation progressive en fonction de la tension anodique. Pour de faibles tensions, ces couches sont amorphes. Calcul des indices de réfraction et d'absorption à partir des données spectroreflectrométriques. Au cours de l'électrocoloration avec des ions H**(+), Li**(+), Na**(+), une diminution des pics Raman des vibrations des liaisons W-O et une apparition des
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24

Falaras, Polycarpos. "Etude des propriétés électrochromes des films anodiques de trioxyde de tungstène." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37597499r.

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25

Bohnke, Claude. "Application de la méthode des diagrammes d'impédance complexe à l'étude de couches minces électrochromes de trioxydes de Tungstène." Besançon, 1986. http://www.theses.fr/1986BESA2012.

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Considérations sur les différents problèmes poses par l'utilisation de couches minces de wo::(3) amorphe en relation avec les informations apportées par les diagrammes d'impédance : analogie avec les piles, porosité, mesure des coefficients de diffusion, contact semi-conducteur et contact ohmique
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Bohnke, Claude. "Application de la méthode des diagrammes d'impédance complexe à l'étude de couches minces électrochromes de trioxyde de tungstène." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37596120d.

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27

CHEN, HUNG-HSIANG, and 陳宏庠. "Study of Tungsten Trioxide and Tungsten Trioxide Hydrate Nanoparticles on Lung Cytotoxicity." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/353752.

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碩士<br>國立虎尾科技大學<br>生物科技系碩士班<br>107<br>In this experiment, tungsten trioxide (WO3) was modified to synthesize tungsten trioxide hydrate (WO3·H2O). The lung cytotoxicity test of WO3 and WO3·H2O will be evaluated in this study and its mechanism will be explored. Results indicated that WO3 and WO3·H2O induced significant decreases in cell viability (<86% of control) and significant increases in LDH leakage (>110% of control) after 24 hr exposure. Both of the materials reduced the expression of HO-1 (0.15-0.33 folds of control) and SOD-2 (0.31-0.66 folds of control) that increased the production of
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Chen, Jin-Wei, and 陳晉瑋. "Electrochromic Properties of Reduced Graphene Oxide and Molybdenum Trioxide Mixed with Tungsten Trioxide." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/674xj9.

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Zheng, Wen-Hao, and 鄭文豪. "Fabrication of Tungsten Trioxide Low Concentration Acetone Sensors." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/63325862968886969861.

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碩士<br>國立中興大學<br>機械工程學系所<br>102<br>This study presents an acetone gas sensor integrated with sensing electrodes, heater and thermometer. The sensor is fabricated by commercial 0.18 μm CMOS process. Tungsten trioxide sensing film is prepared by the sol-gel method, and it is coated on the sensing electrodes of the sensor, which use to detect low concentration acetone gas. The sensing mechanism of the gas sensor is chemoresistor. When the tungsten trioxide senses acetone gas, the oxygen ions on the surface of tungsten trioxide react with acetone gas, resulting in the resistance of tungsten triox
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Wiggenhorn, David Craig. "Nanostructured Tungsten Trioxide Photoanodes for Solar Energy Conversion." Thesis, 2014. https://thesis.library.caltech.edu/8050/1/wiggenhorn_david_craig_2014_thesis.pdf.

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Nanostructured tungsten trioxide (WO<sub>3</sub>) photoelectrodes are potential candidates for the anodic portion of an integrated solar water-splitting device that generates hydrogen fuel and oxygen from water. These nanostructured materials can potentially offer improved performance in photooxidation reactions compared to unstructured materials because of enhancements in light scattering, increases in surface area, and their decoupling of the directions of light absorption and carrier collection. To evaluate the presence of these effects and their contributions toward energy conversion effic
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Tzu-ChiehChou and 周子傑. "Fabrication of Tungsten Trioxide (WO3) Based Gas Sensors." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7nx897.

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"Die reaktiwiteit van wolframhoudende katalisatore met behulp van kumeen as toetsreaktant." Thesis, 2015. http://hdl.handle.net/10210/13380.

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Murray, Andrew John. "Synthesis of Tungsten Trioxide Thin Films for Gas Detection." Master's thesis, 2010. http://hdl.handle.net/10048/999.

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The ability to detect and quantify presence and concentration of unknown gasses is sought for applications ranging from environmental monitoring to medical analysis. Metal oxide based chemical sensing technology currently exists but the ability to provide a compositional gas breakdown reliably within a short time frame is not readily available. A very small sensor that can differentially identify the type and concentration of a gas is required. Novel methods of creating low cost and easily tuned one and two-dimensional gas sensing elements are explored. Tungsten trioxide has been thoroughly do
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Yeh, Po-Cheng, and 葉柏呈. "Synthesis and Electrochromic Characteristics of Graphene/Tungsten Trioxide Nanocomposites." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/8js68u.

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碩士<br>國立交通大學<br>照明與能源光電研究所<br>102<br>In recent years, nano-structured materials for electrochromic device have being widely explored. Among them, WO3 and graphene 1D nano-structured have attracted great attention due to their large specific surface area. Their fast electron mobility results in low resistivity is suitable for electronic component and application. In this thesis, the combination of those two materials as graphene-WO3 composite that have unique characteristic in electrochromic application was comprehensively studied. The production of GRA (graphene)/WO3 nanobundles structure was
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Liao, Xue-Bin, and 廖學彬. "CO2-Sensing Device Based on Tungsten Trioxide Electrochromic Thin Film." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/25038179422615605211.

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碩士<br>國立交通大學<br>電子物理學系<br>84<br>A new CO2 sensor has been made by WO3 thin film electrochromism characteristic.The color of WO3 thin film changes form yellowish to dark blue when H+ has been intercalated in the surface of WO3 resulting from the inverse bias on cathod. By the theorem, We have the platinum micro- electrodes sputtered tungsten trioxide and covered the solid electrolyte which is made by bicarbonate contained and gas- permeable transparent poly vinyl alcohel(PVA). The tungsten
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"Tungsten Trioxide-based Variable Reflectivity Radiation Coatings for Optical Propulsion Applications." Master's thesis, 2020. http://hdl.handle.net/2286/R.I.57326.

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abstract: This thesis explores the potential application of the phase change material tungsten trioxide (WO3) in optical force modulation for spacecraft and satellites. It starts with a literature review of past space optical force applications as well as potential phase change materials for optical force modulation. This is followed by the theoretical model and discussions of the optical properties of a variety of materials used in the structures explored thereafter. Four planar structures were analyzed in detail. Two of the structures were opaque and the other two were semi-transparent. The
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ChengLee and 李晟. "Fabrication of Tungsten Trioxide (WO3) Based Gas Sensors with Metal Nanoparticles." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/de29nk.

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Huang, Yi-Hsuan, and 黃乙軒. "Electrochromic Properties of Tungsten Trioxide Nanowire Networks Structure Synthesized by Hydrothermal Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/70106799102690013027.

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碩士<br>國立交通大學<br>電子研究所<br>100<br>In recent years, nanostructured materials applied to serve as electrochromic device have been widely researched. Among them, WO3 nanorods and nanowires synthesized by hydrothermal method have attracted much attention due to the large specific surface area. However, in order to further improve optical performances of WO3 electrochromic film, the as-grown nanostructures must have the characteristics of highly porous morphology and good adhesion to substrate. In this thesis, we use tungsten hexachloride as precursor to synthesize the highly porous WO3 nanowire
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Hung, Hsien-Chang, and 洪獻彰. "Investigation of electrochromic properties of tungsten trioxide nanowires prepared by solvothermal route." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/52357107220012755366.

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碩士<br>國立高雄應用科技大學<br>化學工程與材料工程系<br>97<br>A novel two-stage solvothermal route was developed to synthesize tungsten trioxide (WO3) nanowires. The tungsten hexachloride were first dissolved in ethanol and heated at 100oC in a teflon-sealed autoclave for 10 h.The as-prepared WO3•H2O nanostructures were collected and heated at a high pressure for another 10 h, the morphology of WO3•H2O varied with the change in temperature. It was found that the morphology of WO3•H2O changed from nanosheets to nanowires as the temperature increased from 100 to 150oC. The cyclic voltammograms analysis showed that
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Mwakikunga, Bonex Wakufwa. "Nano-size effects on optical, structural and phononic properties of VO2 and WO3 by ultrasonic-nebulizer spray pyrolysis technique." Thesis, 2007. http://hdl.handle.net/10539/2082.

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Student Number : 0420699F - MSc Dissertation - School of Physics - Faculty of Science<br>This dissertation presents for the first time the conditions for the synthesis of VO2 by ultrasonic nebula-spray pyrolysis (UNSP) from a precursor solution of NH4VO3+VCl3 optimized as follows: a carrier gas of argon at a flow rate of 11 liters per minute, a furnace temperature of 400 to 700oC. This work also incorporates thermodynamic variables of Tpr-P-V into the equations that relate the mean diameter of droplets, D, to frequency of the exciting ultrasound waves, f, the density of the precursor s
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Liu, Cyuain-Jin, and 劉權津. "Investigation of Electrochromic Properties of Tungsten Trioxide Nano-structure Preparation by Hydrothermal Process." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/f2g9yd.

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碩士<br>義守大學<br>材料科學與工程學系<br>103<br>The purpose of this study is to fabricate the nano-structures tungsten trioxide ( WO3 ) films by hydrothermal process and investigate the microstructure morphologies and electrochromic properties. The mixtures of sodium tungstate ( Na2WO4 ), hydrochloric acid ( HCl ), oxalic acid ( H2C2O4 ) and sodium chloride ( NaCl, capping agents ) were adopted to be the precursors of WO3 films for the hydrothermal process. The hexagonal structure WO3 films were grown on FTO substrate by varying the concentrations of mixtures, growth temperatures and growth times. At the sa
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蔡侑東. "Fabrication and analysis of solid-state tungsten trioxide－nickle oxide complementary electrochromic devices." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/40327053280968176982.

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Lin, Shih-Cheng, and 林士程. "The improvement of optical CO2-sensing device based on tungsten trioxide thin film." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/87226488016758340780.

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碩士<br>國立交通大學<br>電子物理學系<br>85<br>In order to improve the optical CO2 microsensor constructed previously, We first tried to change the quality of the WO3 film by sputtering at various temperatures. When WO3 was deposited at elevated temperatures, the device under CO2 shows a larger transmittance variation, but the switching time becomes longer also. We also found that by re-configuration of the device to allow current to go through the WO3 thin film only, the resistor-like device can swit
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GOLITSYNA, Julia. "Influence of hydrophilic additives on antimicrobial properties of tungsten trioxide in polypropylene matrix." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-170538.

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Tumbain, Sone Bertrand. "Low temperature tungsten trioxide nano/micro-systems for applications in gas sensing and electrochromism." 2013. http://hdl.handle.net/11394/3835.

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Philosophiae Doctor - PhD<br>In this work we primarily set out to investigate the technique of Aqueous Chemical Growth as a means of producing WO3 thin films that find applications in gas sensing and electrochromism. For the first time we demonstrated in this work, the heterogenous nucleation and growth of WO3 thin films on plain glass substrates and F-doped SnO2-glass substrates. This was achieved without the use of surfactants and template directing methods, using as a precursor solution Peroxotungstic Acid generated from the action of 30% H2O2 on pure W powder. The substrates used needed no
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Hsieh, Jia-Cian, and 謝佳倩. "Investigation of Electrochromic Properties of Novel Tungsten Trioxide Nano-structure Preparation Using Hydrothermal Process." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9hkd8j.

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碩士<br>義守大學<br>材料科學與工程學系<br>104<br>The purpose of this study is to fabricate the one-dimension tungsten trioxide (WO3) nano-rod (WNRs) films by hydrothermal process and investigate the relationship between microstructure morphologies and electrochromic properties. A WO3 seed layer with monoclinic structure was deposited on a fluorine doped tin oxide (FTO) coated glass substrate by spin coating and atmospheric pressure plasma jet deposition system. The mixtures of sodium tungstate (Na2WO4), hydrochloric acid (HCl), oxalic acid (H2C2O4) and sodium acetate (CH3COONa, capping agent) were adopted to
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LIN, SHENG-SHIANG, and 林聖翔. "Oxalic Acid Dihydrate-Assisted Synthesis of Oriented Crystalline Tungsten Trioxide Hydrates and Their Applications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8785vp.

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碩士<br>國立高雄大學<br>應用化學系碩士班<br>105<br>Dyes are most widely used in paper, textile industries and the release of this kind of colored wastewater can introduce the environmental pollution, so the removal of dyes is very important. In recent years, researchers use metal oxide for dye adsorption, with quite significant effect. This study proposes a solvothermal method with sodium tungstate as the starting material and water/isopropanol as solvent. In the presence of oxalic acid, the reaction temperature and time were changed, and a series of tungsten oxide and hydrated tungsten oxide products with
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鄭家偉. "Research of tungsten trioxide Nano-powder made from new-type plasma arc evaporation system." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/84958368644922188347.

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碩士<br>大葉大學<br>機械工程學系碩士班<br>91<br>A laboratory-made equipment and manufactory was to improve in this study to produce nanopowder. This equipment uses plasma arc as a heating source. In this heating source, all of the metal and ceramics materials can be vaporized. According to the published papers and patents a new equipment is designed, test and set up manufactory parameter. The collected powders from collected vessel were analyzed using SEM, HRTEM, XRD and XAS.The characteristic, stability and production of this equipment was also evaluated. The experiment result shows that the imag
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Lin, Cheng-Xian, and 林承賢. "A visible light activated tungsten trioxide based sensor for gas sensing at room temperature." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/32897695845603575817.

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碩士<br>國立臺灣海洋大學<br>光電科學研究所<br>101<br>In this work, we demonstrated a visible light-activated WO3 gas sensor operated at room temperature. The highly efficient and reliable organic light-emitting devices (OLEDs) were integrated with the sensor to be the activation light source. Due to the characteristics of area light emitting, the OLEDs provided not only efficient but also uniform activation for the gas sensing layers. From the sensing response measurement for the wavelength dependence, the green light was observed to be the most suitable activation light source for WO3, which is fitting well t
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"A Study of Dendritic Filament Growth in Tungsten Tri-oxide and Copper Electrolytes." Master's thesis, 2019. http://hdl.handle.net/2286/R.I.53893.

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abstract: ABSTRACT Programmable metallization cell (PMC) technology uses the mechanism of metal ion transport in solid electrolytes and electrochemical redox reactions to form metallic electrodeposits. When a positive bias is applied from anode to cathode, atoms at the anode are oxidized to ions and dissolve in the solid electrolyte. They travel to the cathode under the influence of an electric field, where they are reduced to form electrodeposits. These electrodeposits are filamentary in nature and grow in different patterns. Devices that make use of the principle of filament growth have
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