Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 37 for “"WO3"”.
-
Propriétés optiques et électrochromes des couches minces de wo3 et de wo3-v2o5 déposés par évaporation thermique spontanée
Le trioxyde de tungstène (WO 3) est un oxyde de métal de transition (TMO) très connu présentant une coloration électrochrome (EC) qui se situe commodément dans la région spectrale solaire. Cette coloration réversible peut être induite sous une forme pratique par la fabrication de dispositifs EC à …
-
WO3-based bifunctional devices for light harvesting-energy storage
L'abstract è presente nell'allegato / the abstract is in the attachment
-
Katalyse und in situ Spektroskopie an promotiertem und unpromotiertem WO3/ZrO2
… UV-vis, TPR und FTIR am unpromotierten WO3/ZrO2-Katalysator (WZ) bestätigt die in der Literatur beschriebenen Strukturmodelle 9,11,96,103 . . Die Wolframphase liegt nicht als kristallines Wolframtrioxid, sondern als amorphe Oberflächenwolframate vor, wobei die Wolframatome weitgehend …
-
Ottimizzazione della sintesi Idrotermale di nanorods di WO3 per applicazioni energetiche e ambientali
… di proprietà controllabili. Tra questi, il WO3 è un semiconduttore di tipo n con un gap di banda indiretta compresa tra 2,6-3,2 eV e un'elevata stabilità chimica e fisica, che lo rendono il candidato più adatto per molte applicazioni, come il sensing, le smart windows elettrocromiche, lo …
-
Synthesis and characterization of tungsten oxide wo3 nanostructures thin films for gas sensing applications
… temperature gas sensor based on tungsten oxide (WO3) thin films. The synthesis of WO3 thin films was carried out using a direct current (DC) reactive magnetron sputtering at different deposition temperatures (300, 400 and 500 ºC). The deposition time, pressure, power, oxygen and argon flow rates …
-
Functional Oxides in Optical and Electronic Applications by Atmospheric Pressure Spatial Chemical Vapour Deposition
… One prominent oxide, tungsten oxide, or WO3, stands out in academic research because it is CMOS-compatible and is a binary oxide making it easier to process. It has many other potential applications in gas sensing, photocatalysis, smart windows, water splitting and etc. However, WO3 does …
-
Umfärbung von dünnen Wolframoxid-Schichten mit Platin-Belegung durch Gaseinwirkung
… vorliegende Arbeit untersucht Wolframtrioxid-(WO3-)Schichten mit einer sehr geringen Platin-Belegung, deren Transmission durch Einwirkung reaktiver Gase geregelt werden kann. Es wurden WO3-Schichten mit Dicken im Nano- bis Mikrometerbereich durch Vakuumverfahren (PVD, CVD) hergestellt und im …
-
Effets de l'atmosphère ambiante sur les propriétés électro-optiques d'un dispositif électrochrome solide
… et électriques d’un système substrat / Au / a ~ WO3 /MgF2 / Au changent sous l’effet d’un champ électrique et de l’humidité ambiante. Une coloration est observée lors de l’injection d’ions et d’électrons à l’intérieur du WO3. Ce processus devient réversible en inversant la polarité. Les molécules …
-
ΜΕΛΕΤΗ ΤΗΣ ΕΠΙΔΡΑΣΗΣ ΟΞΕΙΔΙΩΝ ΣΤΟΙΧΕΙΩΝ ΜΕΤΑΠΤΩΣΕΩΣ ΣΤΙΣ ΧΗΜΙΚΕΣ ΚΑΙ ΦΥΣΙΚΟΜΗΧΑΝΙΚΕΣ ΙΔΙΟΤΗΤΕΣ ΤΟΥ ΚΛΙΝΚΕΡ
… PRESENT THESIS IS THE INFLUENCE OF MOO3, NB2OR, WO3, AND ZRO2 ONTHE PROPERTIES OF CLINKER AND CEMENT. THE EFFECT OF THE PREVIOUS OXIDES ON THEPROCESSES OF RAW MATERIAL SINZERING AND CEMENT HYDRAMON WAS STUDIED BY MEANS OF DIFFERENTIAL SCANNING CALORIMETRY. X-RAY DIFFRACTION OPTICAL AND ELECTRON …
-
Investigating the interfacial process and bulk electrode chemistry in tungsten oxide electrochromic materials
… thesis focuses on classical tungsten trioxide (WO3) materials as the platform to uncover the previously unknown interrelationship between phase transformation, morphological evolution, nanoscale color heterogeneity, and performance degradation in these materials during 3,000 cyclic voltammetry …
-
Enhancing the photoelectrochemical water splitting characteristics of titanium and tungsten oxide based materials via doping and sensitization
… semiconducting photoelectrodes such as TiO2, WO3 and CuWO4 were investigated. Due to the inherent wide gap, such metal oxides absorb only ultraviolet radiation. Since ultraviolet radiation only composes of 4% of the sun's spectrum, the wide band gap results in lower charge collection and …
-
Development of hybrid inorganic-organic light-emitting devices with metal oxide charge transport layers
… structures comprising of---ZTO as an ETL, WO3 as a HTL, and MoO3 as a hole injecting layer (HIL). The device structures were optimized for better performance in terms of efficiency and operational lifetime. Significant enhancement in EQE and operational lifetime were obtained in HyLEDs …
-
Urea Pre-treatment of N2-annealed Transition Metal Oxides for Low Cost and Efficient Counter Electrodes in Dye-sensitized Solar Cell
… electrocatalytically inactive commercial n-type WO3, SnO2, and ZnO into highly active WO3-x, SnO2-x and ZnO1-x as counter electrodes (CEs) for DSSCs. These new metal oxides replaced Pt by controlling the number of introduced oxygen vacancies. All the metal oxides including WO3, SnO2, and ZnO were …
-
SYNTHESIS AND CHARACTERIZATION OF NEW ELECTROCATALYTIC MATERIALS TO IMPROVE THE PERFORMANCE, OPERABILITY AND LIFE-TIME OF PEMFCS
… effect. The supports such as tungsten trioxide (WO3) may bring its own (electro)chemical function for oxygen reduction reaction (ORR), methanol or CO oxidation. What’s more, the support materials can also influence the durability of the catalysts. The development of promising and new catalyst …
-
Études électro-optiques des couches préparées par la méthode sol-gel
Deux matériaux électrochromes (WO3 et V2O5) ont été préparés par la méthode sol-gel en utilisant des précurseurs organo-métalliques. Les propriétés optiques, électrochromes et électrochimiques des matériaux ont été caractérisées par les mesures de spectrométrie, de spectroscopie de Transformée de …
-
Physikalische Charakterisierung optisch schaltender Fenster auf der Basis photoelektrochemischer elektrochromer Systeme
… Farbstoffsolarzelle und elektrochromen Element (WO3) kann als Gebäudeverglasung mit variabler Transmission eingesetzt werden. Der Solarzellenteil erzeugt bei Lichteinfall elektrische Spannung und Strom, mittels derer der elektrochrome Teil eingefärbt wird => Abnahme der Transmission. <br>Im …
-
Fabrication of smart glass electrochromic device using rf magnetron sputtering
… during the fabrication of tungsten trioxide (WO3) as an electrochromic glass for window glazing application by using RF magnetron sputtering. The oxygen flow rate for the deposition is varied from 10sccm -22sccm which is 25%, 27%, 30%, and 35% of oxygen flow. The structures of WO3 were …
-
Structural studies on Functional Materials using Solid-State NMR, Powder X-ray Diffraction and DFT Calculations
… in (MoO2)2P2O7 pyrophosphate, tungsten trioxide WO3 and negative thermal expansion ZrW2O8. DFT methods using CASTEP software to calculate 31P and 17O NMR parameters are performed on these structures and discussed in comparison to experimental results, published structures and thermal mechanisms.
-
Fundamentals and application of the collapse transition of poly(acrylic acid) for synthesis of various polymer-templated nanoparticles
… properties of a hydrothermally-synthesized WO3 system were evaluated and Pt deposition on the WO3 system improved amaranth decolourization efficiency. The versatility of the approach in creating a wide range of nanoparticles was demonstrated and a universal method for creating various …
-
Intrinsic and Extrinsic Catalysis in Zirconium-based Metal-Organic Frameworks
… through a mixed linker synthesis and grown on a WO3 substrate (Ru-UiO-67/WO3). Previous work from our group demonstrated Ru-UiO-67 retained the catalytic activity as the molecular species, while improving the recyclability of the material. In this work, addition of WO3 as a light harvester …
Page 1 of 2