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Silver Nanoparticles: Green Route, Stability and Effect of Additives

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DOI: 10.4236/jbnb.2011.24048    8,095 Downloads   16,595 Views   Citations

ABSTRACT

Colloidal silver nanoparticles were prepared by reducing silver nitrate with oxalic acid in presence of cetyltrimethylammonium bromide (CTAB). The synthesized silver particles show an intense surface plasmon band in the visible region. The work reported in this paper describes the effect of concentration of various additives (NaCl, NaBr, NaNO3, Na2SO4 and NaH2PO4) and ammonia on the growth and stability of Ag-nanoparticles. In all the cases the rate decreases as the [electrolytes] or [ammonia] increases. The nature, polarizability and coordinating ability of the anions play vital roles for nucleus formation and the growth process, which subsequently form different size particles. Transmission electron microscopy, selected areas electron diffraction, and UV-visible spectroscopy have been employed to characterize Ag-nanoparticles. The effect of the following variables on the particle size and size distribution was investigated: the [oxalic acid], [CTAB] and [Ag+].The nanoparticles are stable in NaNO3 and NaH2PO4 solutions; but NaCl, NaBr and Na2SO4 causes their aggregation.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Z. Khan, J. Hussain, S. Kumar, A. Hashmi and M. Malik, "Silver Nanoparticles: Green Route, Stability and Effect of Additives," Journal of Biomaterials and Nanobiotechnology, Vol. 2 No. 4, 2011, pp. 390-399. doi: 10.4236/jbnb.2011.24048.

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