Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/43567
Title: Photochromism of Molybdenum Oxide
Authors: MEHDI ROUHANI
Keywords: Photochromism, Molybdenum oxide, Adbsorption, stoichiometry, color, Mechanism
Issue Date: 12-Apr-2013
Source: MEHDI ROUHANI (2013-04-12). Photochromism of Molybdenum Oxide. ScholarBank@NUS Repository.
Abstract: The primary objective of this study is to investigate the effect of stoichiometry of MoO3-x thin amorphous-flms on the photochromism of the films. Different deposition conditions were used to fabricate films with different stoichiometries. The effect of deposition conditions on the intrinsic color and photochromic properties of deposited films was investigated. The rate of film coloration under UV-irradiation was studied using UV-vis spectroscopy. The conversion between Mo6+ and Mo5+ for as-deposited and UV-irradiated films was determined using x-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. This study shows that photochromic properties of amorphous MoO3-x films change depending on stoichiometry of the films. Therefore, the mechanism of photochromism is different for films with complete and sub-stoichiometries. Associating the deviation from complete stoichiometry with oxygen vacancies, we can conclude that, oxygen vacancies do not play any role in the photochromism of the films with near complete stoichiometries, while their contribution to the photochromism of essentially non-stoichiometric films is dominant.
URI: http://scholarbank.nus.edu.sg/handle/10635/43567
Appears in Collections:Ph.D Theses (Open)

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