Res. Chem. Intermed.
, Vol. 32, No. 2, pp. 103–113 (2006)
Also available online - www.vsppub.com
Synthesis of Au, Au/Ag, Au/Pt and Au/Pd nanoparticles
using the microwave-polyol method
, SUDHIR KAPOOR
, DEVILAL PURSHOTTAM DAVE
and TULSI MUKHERJEE
Department of Chemistry, The Institute of Science, Mumbai 400 032, India
Radiation Chemistry and Chemical Dynamics Division, Bhabha Atomic Research Centre,
Mumbai 400 085, India
Received 5 April 2005; accepted 13 May 2005
Abstract—Gold, Au/Ag, Au/Pt and Au/Pd bimetallic nanoparticles with varying mol fractions were
synthesized in ethylene glycol and glycerol, using the microwave technique in the presence of a
stabilizer poly(N-vinylpyrrolidone) (PVP). It was found that bimetallic colloids of Au/Ag, Au/Pd
and Au/Pt form an alloy either on co-reduction of respective metal ions or on mixing individual sols.
Keywords: Nanoparticles; microwave; electron transfer.
In recent years, a burst of research activities has been seen in the synthesis
and characterization of metal nanoparticles. The main reason for this is that
nanoparticles have a variety of unique spectroscopic, electronic and chemical
properties that arise from their small sizes and high surface/volume ratio. The
study and preparation of inorganic crystalline particles on the nanometer scale
has attracted considerable attention from both fundamental and applied research
aspects. Hence, the quantum size effects, non-linear optical effects and electron
dynamics of noble metal nanoparticles are being extensively investigated [1–10].
Metal nanoparticles also exhibit new optical properties which are observed neither
in the individual molecules nor in the bulk metals [11 –13]. One particular example
is the presence of a strong absorption band in the visible region. This arises due
to the surface-plasmon-oscillation modes of conduction electrons that are coupled
through the surface to external electromagnetic ﬁelds [11 –13]. In this regard, metal
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