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    Ionic liquid-facilitated synthesis and catalytic activity of highly dispersed Ag nanoclusters supported on TiO2

    Access Status
    Fulltext not available
    Authors
    Zhang, H.
    Li, Xin Yong
    Chen, G.
    Date
    2009
    Type
    Journal Article
    
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    Citation
    Zhang, H. and Li, X.Y. and Chen, G. 2009. Ionic liquid-facilitated synthesis and catalytic activity of highly dispersed Ag nanoclusters supported on TiO2. Journal of Materials Chemistry. 19 (43): pp. 8223-8231.
    Source Title
    Journal of Materials Chemistry
    DOI
    10.1039/b910610c
    ISSN
    0959-9428
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/21329
    Collection
    • Curtin Research Publications
    Abstract

    This study describes a one-pot sol-gel method for the synthesis of Ag/TiO2 nanocomposite powders. TEM images showed that the Ag clusters formed with this method are highly dispersed on the surface of TiO2 nanoparticles. UV/visible spectroscopy results indicated that [BMIM][PF 6], an imidazolium-based room-temperature ionic liquid, strongly inhibited the formation and growth of Ag clusters in N,N-dimethylformamide (DMF) solvent. This made it possible to prepare a stable stock solution containing AgNO3-[BMIM][PF6]-DMF. Dilution of the stock solution followed by hydrolysis resulted in a gel that was processed to produce Ag/TiO2 nanocomposites containing Ag clusters with average size smaller than 3 nm. XPS results indicated that the silver species exist predominantly in the metallic form. Because of the high dispersion and controlled size of the Ag clusters, the Ag/TiO2 nanocomposites demonstrated excellent catalytic performance in the aqueous phase reduction of methylene blue and the hydrogenation of 4-nitrophenol using NaBH4 as the reducing agent. © 2009 The Royal Society of Chemistry.

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