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

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


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.

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Field of science, Statistics Finland

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