Title

The photocoloration of transition metal oxides

Date of Award

2001

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Chemistry

Advisor(s)

Joseph Chaiken

Keywords

Photocoloration, Transition metal oxides, Optical memory, Electrochromic

Subject Categories

Chemistry | Physical Sciences and Mathematics

Abstract

We have introduced a novel hypothesis for describing the reversible photocoloration of WO 3 using sub-bandgap light. Unlike earlier explanations of the well known electrochromism and super-bandgap photochromism, this hypothesis involves a mechanism which is independent of water, i.e. protons, or other cations. Our results demonstrate an independent mechanism in which oxygen exchange between the sample and the ambient atmosphere during the reversible photocoloration process plays the dominant role. Raman, Diffuse Reflectance IR spectroscopies, and electron scattering for chemical analysis (ESCA) were used to characterize our tungsten-oxygen system. We have also identified a set of fundamental parameters and their quantitative relationships. The results of this study are adequately accounted for using our proposed hypothesis.

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