Hetero-structured nano-photocatalysts fabricated by dynamic shadowing growth

Wilson Smith; Yiping Zhao

doi:10.1117/12.859912

24 August 2010 Hetero-structured nano-photocatalysts fabricated by dynamic shadowing growth

Wilson Smith, Yiping Zhao

Proceedings Volume 7770, Solar Hydrogen and Nanotechnology V; 777018 (2010) https://doi.org/10.1117/12.859912
Event: SPIE Solar Energy + Technology, 2010, San Diego, California, United States

Abstract

Hetero-structured TiO₂ and WO₃ nanorod arrays have been fabricated by dynamic shadowing growth. The two-layer WO₃/TiO₂ nanorod arrays grown by consecutive deposition of two materials at oblique angle are found to greatly enhance the catalytic performance by the increased TiO2 surface area and the potential enhanced charge separation due to the WO₃-TiO₂ interface. Also, two important factors have been found to affect the observed photocatalytic enhancement: the crystal phase of each material, and the interfacial area between TiO₂ and WO₃. To further increasing the interfacial area between the TiO₂ and WO₃, a dynamic shadowing growth method is used to create a quazi-core-shell nanorod array. WO₃ nanorods are first grown perpendicularly on a bare substrate to serve as the "core", and a TiO₂ "shell" is then deposited. Such a core-shell structure maximizes the interfacial area between the two materials. The photocatalytic decay rate for these core-shell samples again shows further improvement over single layer TiO₂ thin films and multi-layer c-TiO₂/a-WO₃ films by 13 and 3 times respectively. Our results demonstrate that heterostructured WO3/TiO₂ nanorod arrays are promising photocatalyst for water decontamination and water splitting for hydrogen generation.

Citation Download Citation

Wilson Smith and Yiping Zhao "Hetero-structured nano-photocatalysts fabricated by dynamic shadowing growth", Proc. SPIE 7770, Solar Hydrogen and Nanotechnology V, 777018 (24 August 2010); https://doi.org/10.1117/12.859912

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