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Observation of photoexcitation of Fe-oxide grown on TiO2(100) by visible light irradiation

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Abstract

Electronic excitation of materials is of fundamental and technological importance and interest in terms of photoinduced phase transition, photovoltaics, and photocatalysis. In the present study, photoexcitation of Fe2 O 3 epitaxially grown on rutile TiO2(100) was investigated with conversion electron Mössbauer spectroscopy (CEMS) under dominantly visible-light irradiation. 57Fe was deposited on the substrate at a substrate temperature of 973 K, and the resulting film was characterized by RHEED and XPS. After deposition of Fe on TiO2(100), it was found that Fe was oxidized to Fe 3+, and the structure was analyzed to be the rhombohedral phase of Fe2 O 3. While the CEMS spectrum without light irradiation showed a quadrupole splitting of 0.80 mm/s with an isomer shift of +0.25 mm/s, an additional component with a quadrupole splitting of 0.85 and an isomer shift of +0.67 mm/s was observed under light irradiation. The latter component corresponds to a reduced state of Fe at the octahedral site surrounded by oxygen atoms. The lifetime of this photoexcited state is discussed.

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Authors and Affiliations

  1. Institute of Industrial Science, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Taizo Kawauchi, Naoki Nagatsuka & Katsuyuki Fukutani

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  1. Taizo Kawauchi
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  2. Naoki Nagatsuka
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  3. Katsuyuki Fukutani
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Correspondence to Taizo Kawauchi.

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This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mossbauer Effect (ICAME 2015), Hamburg, Germany, 13-18 September 2015

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Kawauchi, T., Nagatsuka, N. & Fukutani, K. Observation of photoexcitation of Fe-oxide grown on TiO2(100) by visible light irradiation. Hyperfine Interact 237, 73 (2016). https://doi.org/10.1007/s10751-016-1230-8

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  • DOI: https://doi.org/10.1007/s10751-016-1230-8

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