Facile and one pot synthesis of gold nanoparticles using tetraphenylborate and polyvinylpyrrolidone for selective colorimetric detection of mercury ions in aqueous medium.

Journal of Analytical Methods in Chemistry
Sidhureddy BoopathiKanala Lakshminarasimha Phani

Abstract

In this work, we reported for the first time, a facile and one step synthesis of gold nanoparticles from HAuCl(4), employing tetraphenylborate as the reducing agent. The synthesis is not only facile but also yields "dumb-bell-shaped"particles. This shape appears to arise from a possible emulsion of the products of oxidation/decomposition of tetraphenylborate by HAuCl(4), surrounding the particle. The size and shape of the AuNPs were characterized by Transmission electron microscopy (TEM) and UV-visible Spectroscopy. Interestingly, the addition of polyvinylpyrrolidone (PVP) during the synthesis was found to enhance the stability of the nanoparticle dispersion. The particles synthesized under these conditions assume "spherical" shape with the appearance of only transverse surface plasmon resonance band. The highlight of the observations is that the gold nanoparticles synthesized using tetraphenylborate as reducing agent and PVP as stabilizer are highly stable in alkaline medium, in contrast to the synthesis wherein borohydride is used as reducing agent. The AuNPs synthesized using tetraphenylborate and PVP show their mercury sensing behavior only in the alkaline medium. The color of the nanoparticle dispersion undergoes distinct ...Continue Reading

References

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Citations

May 12, 2015·Physical Chemistry Chemical Physics : PCCP·Sara FateixaTito Trindade
Jul 12, 2017·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·M Lutfi FirdausToshitaka Gamo
Apr 22, 2017·Journal of Fluorescence·Bahram Ghanbari, Morteza Zarepour-Jevinani

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Methods Mentioned

BETA
surface plasmon resonance
surface plasmon band

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