Journal
NANO RESEARCH
Volume 4, Issue 9, Pages 861-869Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-011-0142-9
Keywords
Gold nanoparticles; ammonium bicarbonate; catalytic activity; 4-nitrophenol
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Funding
- National Natural Science Foundation of China [21071136]
- National Basic Research Program of China [2010CB934700]
- Chinese Ministry of Education [NCET2006-0552]
- Foundation of Anhui Provincial Education Department [KJ2008A071]
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A new protocol for the synthesis of nearly monodisperse gold nanoparticles with controllable size is described. The pathway is based on the reduction of AuCl (4) (-) by ammonium bicarbonate in the presence of sodium stearate under hydrothermal conditions. The particle sizes could be easily tuned by regulating the reaction conditions including precursor concentration, reaction temperature and growth time. A tentative explanation for the reduction and growth mechanism of uniform gold nanoparticles has been proposed. The as-prepared gold particles showed good catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol by excess NaBH4, and a surface-enhanced Raman scattering (SERS) study suggested that the gold nanoparticles exhibited a high SERS effect on the probe molecule Rhodamine 6G.
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