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Diversity of TiO2: Controlling the molecular and electronic structure of atomic layer deposited black TiO2

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Details

Original languageEnglish
Pages (from-to)2758–2762
Number of pages5
JournalACS Applied Materials & Interfaces
Volume11
Issue number3
DOIs
Publication statusPublished - 4 Jan 2019
Publication typeA1 Journal article-refereed

Abstract

Visually black, electrically leaky, amorphous titania (am-TiO2) thin films were grown by atomic layer deposition (ALD) for photocatalytic applications. Broad spectral absorbance in the visible range and exceptional conductivity are attributed to trapped Ti3+ in the film. Oxidation of Ti3+ upon heat treatment leads to a drop in conductivity, a color change from black to white, and crystallization of am-TiO2. ALD-grown black TiO2, without any heat treatment, is subject to dissolution in alkaline photoelectrochemical conditions. The best photocatalytic activity for solar water splitting is obtained for completely crystalline white TiO2.

Publication forum classification

Field of science, Statistics Finland