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|Type of Document
||Characterization of Niobium Doped Titanium Oxide Electrochromic Films Prepared by Liquid Phase Deposition|
|Date of Defense
liquid phase deposition
||Titanium oxide (TiO2) films have been actively investigated as many applications because of the mechanical and chemical durability, high refractive index and high transparency. In catalytic and electrochemical applications, it has been utilized as a stable semiconductor electrode for the conversion of solar energy into chemical or electrical energy. Uniform TiO2 films were deposited on conductive glass substrate (ITO/glass) by liquid phase deposition (LPD) with the aqueous solutions of ammonium hexafluoro-titanate and boric acid. |
Niobium oxide powder and Hydrofluoric acid which add deionized water were used to be Niobium doping solution. Undoped LPD-TiO2 has hydroxyl related defects and Li+ ions will be trapped to degrade the electrochromic durability. For niobium doping, the electrochromic characteristics were enhanced. Niobium doping in TiO2 can reduce hydroxyl related defects. The electrochromic durability was enhanced from 5×103 to 1×104 times. The transparency ratio was enhanced from 61 % to 70 % at the wavelength of 550 nm.
In our experiment, TiO2 films morphology and thickness was characterized by scanning electron microscopy (SEM), structure was characterized by X-ray diffraction (XRD) and surface roughness was measured by atomic force microscopy (AFM), chemical properties was characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR), optical properties was characterized by spectrophotometer (MP-100), and electrochromic characterized by cyclic voltammetry (CHI627C).
||Jeng Gong - chair|
Chen-Lin Ho - co-chair
Tsu-Hsin Chang - co-chair
Ming-Kwei Lee - advisor
Indicate in-campus at 99 year and off-campus access at 99 year.|
|Date of Submission