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Synthesis and Optical Properties of Surface Stabilized Gold Nanoparticles with Poly(Vinyl Pyrrolidone) Polymer Molecules of a Nanofluid

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Surface stabilized gold nanoparticles (Au-NPs) and self-assembly of them offer tailored functional properties useful for biological reactions, biodiagnostic assays, and other applications. This paper describes a simple synthesis of Au-NPs from a sonication assisted caloric dissociation reaction of a gold salt HAuCl4·3H2O in presence of reactive polymer molecules such as poly(vinyl pyrrolidone) (PVP) in form of a nanofluid in water. Size of the Au-NPs, ranging from 10 to 110 nm, is easily controlled by varying the content of PVP molecules (0.01–10 g/dL) relative to an aqueous salt precursor. Reactions carried out in a batch of 5.1 mL sample demonstrate that the PVP molecules not only tailor the basic size and shape of resulting Au-NPs but also two-dimensional assembles of them that develop in part of the reaction. Light-absorption (460–960 nm) in Au-NPs in these nanofluids is influenced by content of PVP molecules used during the reaction. A maximum absorption extinction coefficient 1.1 × 104 L-mol–1 cm–1 is achieved in 1.0 g/dL PVP with 0.001 mM Au-NPs. An intense light emission 280–560 nm is obtained in this sample in combined effects of the surface enhanced light-absorption in Au-NPs and a dielectric surrounding with metal-insulator interfaces. Results are discussed in correlation with shape, size and assemblies in the Au-NPs with a polymer surface layer.
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Document Type: Research Article

Publication date: 2011-11-01

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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