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In situ study of photo- and thermo-induced color centers in photochromic rutile TiO2 in the temperature range 90–720 K

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Abstract

This article reports an in situ UV-Vis-NIR diffuse reflectance (DR) spectroscopic and kinetic study of the photoformation and thermal annealing of light absorbing electronic point defects (color centers) in photochromic TiO2 in the temperature range 90-720 K using a simple laboratory-made cryostat-type accessory (for a Cary 5000 spectrophotometer equipped with an integrating sphere). The accessory also allowed for UV-Vis-NIR DR studies to be undertaken either in vacuum or in an oxygen atmosphere at significantly high temperatures (to 720 K) to assess dark chemical events occurring in photochromic titania with the participation of color centers. The DR spectral and kinetic measurements provided the opportunity to examine the separation of photoinduced charge carriers at traps and thermally stimulated carrier detrapping and recombination, as well as the response of color centers to oxidative/reductive treatments of photochromic TiO2. Kinetic results also demonstrate the applicability of the fabricated DR accessory as a high-temperature reaction cell in the systematic study of the principal regularities in the formation and destruction of color centers in titania at various temperatures and gaseous atmospheres.

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Authors and Affiliations

  1. St. Petersburg State University, St. Petersburg, Universitetskaya nab., 7/9, 199034, Russian Federation

    V. N. Kuznetsov

  2. Laboratory “Photoactive Nanocomposite Materials”, St. Petersburg State University, St. Petersburg, Universitetskaya nab., 7/9, 199034, Russian Federation

    N. I. Glazkova & R. V. Mikhaylov

  3. PhotoGreen Laboratory, Dipartimento di Chimica, Università di Pavia, via Taramelli 12, Pavia, 27100, Italy

    N. Serpone

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  1. V. N. Kuznetsov
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  2. N. I. Glazkova
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  3. R. V. Mikhaylov
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  4. N. Serpone
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Correspondence to N. Serpone.

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Kuznetsov, V.N., Glazkova, N.I., Mikhaylov, R.V. et al. In situ study of photo- and thermo-induced color centers in photochromic rutile TiO2 in the temperature range 90–720 K. Photochem Photobiol Sci 15, 1289–1298 (2016). https://doi.org/10.1039/c6pp00163g

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  • DOI: https://doi.org/10.1039/c6pp00163g

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