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Issue 4, 2014
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Galvanic replacement of As(0) nanoparticles by Au(iii) for nanogold fabrication and SERS application

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Abstract

A galvanic replacement reaction between As(0) nanoparticles and Au(III) ions has been reported for the first time. Initially the stable yellow-brown As(0) nanoparticles were prepared by the borohydride reduction of an arsenite solution. The characterization of the As(0) particles was discussed in a recent report. In the present work these As(0) nanoparticles were exploited to fabricate gold nanoparticles (AuNPs). The as-obtained red colored gold sol showed a λmax at 540 nm and the size of the AuNPs were 62 ± 7 nm as observed from TEM analyses. It was interesting to note that the size of the AuNPs was comparable to that of the As(0) nanoparticles, which could be a sign of galvanic replacement in the absence of any stabilizer. The particles were spherical with a hollow core. The AuNPs were characterized by SEM, TEM, XRD, DLS and UV-visible spectroscopy. FTIR and Raman analysis indicated that during the galvanic replacement reaction As(0) was oxidized to arsenate, which stabilized the AuNPs through adsorption and H-bonding. Thus a stable assembly of AuNPs was obtained in the absence of any external stabilizer. The potential of such an assembly was further exploited for SERS detection of Rhodamine 6G, 4-mercaptopyridine and 4-aminothiophenol.

Graphical abstract: Galvanic replacement of As(0) nanoparticles by Au(iii) for nanogold fabrication and SERS application

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Supplementary files

Article information


Submitted
27 Nov 2013
Accepted
08 Jan 2014
First published
09 Jan 2014

New J. Chem., 2014,38, 1675-1683
Article type
Paper

Galvanic replacement of As(0) nanoparticles by Au(III) for nanogold fabrication and SERS application

A. Pal, S. Saha, S. K. Maji, R. Sahoo, M. Kundu and A. Kundu, New J. Chem., 2014, 38, 1675
DOI: 10.1039/C3NJ01489D

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