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

Research output: Contribution to journal › Article › Scientific › peer-review

60 Citations (Scopus)

141 Downloads (Pure)

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 and 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

Funding

This work was supported by the Academy of Finland (decision numbers 141481, 286713 and 309920). H.A. and B.D.B. were supported by the Jenny and Antti Wihuri Foundation. M.H. was supported by the TUT’s Graduate School and Emil Aaltonen Foundation.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

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Publication forum level 2

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10.1021/acsami.8b20608Licence: CC BY

acsami.8b20608
With CC-BY license https://creativecommons.org/licenses/by/4.0/
Final published version, 3.39 MB

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

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

Cite this

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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.",

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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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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

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ER -

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

Abstract

Funding

UN SDGs

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Equipment

Material characterization of physics

Photonic materials

Tampere Microscopy Center

Cite this