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Structural properties of TiO2 nanocrystallites condensed in vapor-phase for photocatalyst applications

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Abstract

We have synthesized titanium dioxide (TiO2) nanocrystallites by pulsed laser ablation (PLA) in oxygen (O2) background gas for photocatalyst applications. Varying O2 background gas pressure \( \left( {P_{{{\text{O}}_{ 2} }} } \right) \) or substrate target distance (D TS), it was possible to change weight fraction of anatase phase in the anatase/rutile mixture from 0.2 to 1.0. Porosity of the deposited TiO2 films increased with increasing \( \left( {P_{{{\text{O}}_{ 2} }} } \right) \) and D TS. Relation between the process parameters and the formed crystal phases was explained from the point of cooling process in vapor-phase. Furthermore, rapid thermal annealing (RTA) was performed as post-annealing, suppressing sintering of the nanocrystallites. Photocatalytic activities of the TiO2 nanocrystallites depended on the RTA temperature and following crystallinity restoring as well as the crystal phase: anatase or rutile.

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Acknowledgments

This study was partially supported by a Grant-in Aid for Scientific Research from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Anan National College of Technology, Anan, 774-0017, Tokushima, Japan

    Takehito Yoshida & Riki Nakagou

  2. Department of Physics, Konan University, Kobe, 658-8501, Japan

    Nobuyasu Yagi, Akira Sugimura & Ikurou Umezu

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  1. Takehito Yoshida
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  2. Nobuyasu Yagi
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  3. Riki Nakagou
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  4. Akira Sugimura
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  5. Ikurou Umezu
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Correspondence to Takehito Yoshida.

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Yoshida, T., Yagi, N., Nakagou, R. et al. Structural properties of TiO2 nanocrystallites condensed in vapor-phase for photocatalyst applications. Appl. Phys. A 117, 223–227 (2014). https://doi.org/10.1007/s00339-014-8378-3

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  • DOI: https://doi.org/10.1007/s00339-014-8378-3

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