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  • Title: Visible light photocatalysis with c-WO(3-x)/WO3×H2O nanoheterostructures in situ formed in mesoporous polycarbosilane-siloxane polymer.
    Author: Seifollahi Bazarjani M, Hojamberdiev M, Morita K, Zhu G, Cherkashinin G, Fasel C, Herrmann T, Breitzke H, Gurlo A, Riedel R.
    Journal: J Am Chem Soc; 2013 Mar 20; 135(11):4467-75. PubMed ID: 23421377.
    Abstract:
    In recent years, there have been significant efforts to find novel photocatalytic materials with improved properties. Thus, there is an active ongoing search for new materials that can operate at a broad range of wavelengths for photocatalytic reactions. Among photocatalytically active semiconductors, considerable attention has been given to tungsten oxide with a band gap of E(g) ≈ 2.6 eV, which provides the opportunity to harvest visible light. In the present work, we report on a one-step synthesis of c-WO(3-x)/WO3×H2O nanowhiskers dispersed in a hydrolytically stable mesoporous polycarbosilane-siloxane ([-Si(O)CH2-]n) matrix. The as-synthesized nanocomposites possess high photocatalytic activity for the degradation of methylene blue (MB) under visible light irradiation. The enhanced photocatalytic activity is due to (i) the reduction in the electron-hole recombination rate because of the reduced dimensions of nanowhiskers, (ii) more efficient consumption of photogenerated electrons and holes as a result of the high surface-to-bulk-ratio of the nanowhiskers, and (iii) better electron-hole pair separation due to the formation of c-WO(3-x)/WO3×H2O nanoheterostructures.
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