Dissertation > Excellent graduate degree dissertation topics show

Research on Sol-Gel Derived WO3 Electrochromic Films

Author: WangYanXia
Tutor: Yao
School: Tianjin University
Course: Materials Science
Keywords: WO3 TiO2 sol-gel electrochromism
CLC: O614.613
Type: Master's thesis
Year: 2009
Downloads: 48
Quote: 0
Read: Download Dissertation

Abstract


WO3 is the most extensively studied inorganic electrochromic material due to its high coloration efficiency. Most of the current electrochromic devices are constituted with amorphous WO3 because of the poor electrochromic performance of polycrystalline WO3. However, amorphous WO3 film is not stable and its cycling life is limited. A better way to solve this problem is either to fabricate nanocrystalline WO3 with rich porosity or to dope WO3 film.In this thesis,WO3 films are prepared by a simplified sol-gel method. Their appearance and micro structure are analyzed by Scanning Electron Microscope and X-Ray Diffraction. Spectrometer and three electrodes method are used to measure optical and electrochemical performance. The effect of annealing temperatures to structures and electrochromic properties is discussed. Pure WO3 films are better crystallized with the increase of annealing temperatures. WO3film annealed at 300℃is amorphous, while that annealed at 500℃is well-crystallized. The electrochromic properties of amorphous WO3 film are better than those of crystalline one, but the former one tend to flake off the ITO substrate.PEG is added to the pure WO3 precursor as wetting and structure directing agent. WO3 film of interconnected nanocrystalline and nanoporosity is prepared after annealed at 500℃for two hours. It is confirmed that PEG improves the optical modulation of WO3 film through compare of the visible light transmittance of the sample with and without PEG and calculation of the optical density change. UV curves of the film also validate this point.Ti（OBun）4 was added directly to WO3 precursor to synthesize Ti-doped WO3 electrochromic film. Stability of the solution is improved. The crystallized temperature of Ti-doped WO3 film is improved and optical modulation is extended. Doped Ti improved the electrochromic properties of WO3 film further.

Related Dissertations

  1. Studies on the Synthesis and Technology of Dipentaerythritol and Its Derivative,TQ223.164
  2. Preparation and Photocatalytic Properties for Water Decomposition of Titanate Photocatalyst,O643.36
  3. Preparation of Based on the Phenolic Resin of Activated Carbon and Adsorption-Photopcatalytical Character of Supported TiO2,TQ424.19
  4. Study on the Synthesis Bi3.25La0.75Ti3O12（BLT） Nanotubes and Nano Wires,TB383.1
  5. Preparation and Electrocaloric Effect of BaxSr1-xTiO3 Ferroelectric Thin Films,TB383.2
  6. The Preparation and Research of Magnetically Separable TiO2 Photocatalyst Nanofibers,TB383.1
  7. The Study of Preparation and Photocatalytic Activity of TiO2 by Electrospinning,O614.411
  8. Investigation of Fabrication, Characterization and Property of Fuctional Titanium Dioxide Nanoporous Materials,TB383.1
  9. Investigation of Preparation and Properties of Ordered Porous TiO2,TB383.2
  10. Preparation and Performance of V2O5-WO3/MOx/Cordierite Catalyst Modified with Cu、Mn、Ce for DeNOx,X701
  11. Study on Properties of Ce、Co、Ni/V-W/TiO2 Modified by Composite Sol for Selective Catalytic Reduction,X701
  12. Preparation of One-dimensional Nano TiO2 and Study on the Decolorization of Dyeing Wastewater,TB383.1
  13. Electropolymerization and Electrochromic Properties of Conducting Polymers,O631.3
  14. Photodegradation of Orange Ⅱ by Mesoporous TiO2,X791
  15. Study the Detection and Adsorption of Formaldehyde in Indoor Air,X831
  16. Iron, lanthanum -doped nano TiO \u003csub\u003e 2 \u003c/ sub\u003e Preparation and photocatalytic properties,O614.411
  17. Inorganic filler of the modified polylactic acid,TQ320.1
  18. Ni / TiO 2 -SiO 2 Preparation, Characterization and Hydrogenation of Maleic Anhydride,TQ225.2
  19. Nano LaFeO 3 Controllable Synthesis and TiO 2 bridged construct composite photocatalyst,O643.36
  20. Cobalt Ferrite and Its Performance,O611.4
  21. Fabrications and Applications of Microelectrode Array of Silicon Dioxide Cavities and Magnetic Ferroferric Oxide Nano-Bioconjunctions,TB383.1

CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Part Ⅵ group metal elements and their compounds > The chromium Vice family ( Ⅵ B group metal elements) > Tungsten W
© 2012 www.DissertationTopic.Net  Mobile