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

Huanjun Zhang, Xinyong Li, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

149 Citations (Scopus)

Abstract

This study describes a one-pot sol-gel method for the synthesis of Ag/TiO2nanocomposite powders. TEM images showed that the Ag clusters formed with this method are highly dispersed on the surface of TiO2nanoparticles. UV/visible spectroscopy results indicated that [BMIM][PF6], 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/TiO2nanocomposites 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/TiO2nanocomposites demonstrated excellent catalytic performance in the aqueous phase reduction of methylene blue and the hydrogenation of 4-nitrophenol using NaBH4as the reducing agent.
Original languageEnglish
Pages (from-to)8223-8231
Number of pages9
JournalJournal of Materials Chemistry
Volume19
Issue number43
DOIs
Publication statusPublished - 10 Nov 2009
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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