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

Harri Ali-Löytty; Markku Hannula; Jesse Saari; Lauri Palmolahti; Bela D. Bhuskute; Riina Ulkuniemi; Tuomo Nyyssönen; Kimmo Lahtonen; Mika Valden

doi:10.1021/acsami.8b20608

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

Harri Ali-Löytty, Markku Hannula, Jesse Saari, Lauri Palmolahti, Bela D. Bhuskute, Riina Ulkuniemi, Tuomo Nyyssönen, Kimmo Lahtonen, Mika Valden

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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.

Original language	English
Pages (from-to)	2758–2762
Number of pages	5
Journal	ACS Applied Materials & Interfaces
Volume	11
Issue number	3
DOIs	https://doi.org/10.1021/acsami.8b20608
Publication status	Published - 4 Jan 2019
Publication type	A1 Journal article-refereed

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10.1021/acsami.8b20608Licence: CC BY

acsami.8b20608
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http://urn.fi/URN:NBN:fi:tty-201906281916Licence: CC BY

Material characterization of physics
Lahtonen, K. (Contact) & Tukiainen, A. (Contact)
Physics
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Photonic materials
Tukiainen, A. (Contact) & Lahtonen, K. (Contact)
Physics
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Tampere Microscopy Center
Vippola, M. (Manager), Honkanen, M. (Operator) & Salminen, T. (Operator)
Faculty of Engineering and Natural Sciences
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Cite this

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title = "Diversity of TiO2: Controlling the molecular and electronic structure of atomic layer deposited black TiO2",

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.",

author = "Harri Ali-L{\"o}ytty and Markku Hannula and Jesse Saari and Lauri Palmolahti and Bhuskute, {Bela D.} and Riina Ulkuniemi and Tuomo Nyyss{\"o}nen and Kimmo Lahtonen and Mika Valden",

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T1 - Diversity of TiO2: Controlling the molecular and electronic structure of atomic layer deposited black TiO2

AU - Ali-Löytty, Harri

AU - Hannula, Markku

AU - Saari, Jesse

AU - Palmolahti, Lauri

AU - Bhuskute, Bela D.

AU - Ulkuniemi, Riina

AU - Nyyssönen, Tuomo

AU - Lahtonen, Kimmo

AU - Valden, Mika

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N2 - 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.

AB - 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.

U2 - 10.1021/acsami.8b20608

DO - 10.1021/acsami.8b20608

M3 - Article

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JO - ACS Applied Materials & Interfaces

JF - ACS Applied Materials & Interfaces

IS - 3

ER -

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

Abstract

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Material characterization of physics

Photonic materials

Tampere Microscopy Center

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