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

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