Madalina FLEANCU, Nicoleta OLTEANU, Cosmina Andreea LAZAR, Aurelia MEGHEA, Maria MIHALY<br>Controlled Size Gold Nanoparticles Obtained by Tuning Synthesis Parameters in Microemulsion Templates

Madalina FLEANCU, Nicoleta OLTEANU, Cosmina Andreea LAZAR, Aurelia MEGHEA, Maria MIHALY
Controlled Size Gold Nanoparticles Obtained by Tuning Synthesis Parameters in Microemulsion Templates

Abstract:

The technique developed in this study combines microemulsion as one of soft-nanotechnology techniques of wet chemistry with photo-physics of UV-radiation into a unique versatile method to design and obtain controlled nanostructures for multifunctional materials. The UV photo-induced reduction of Au(III) in a series of water in oil microemulsions produced homogeneous spherical particles with various diameters ranging between 2.5 and 30 nm, depending on the oil type used. The gold nanoparticles size can be also tuned by this route, using different initial concentrations of Au(III) precursor of 1, 5 and 10 g/L. The obtained diameters are 10, 45 and 75 nm. The evolution of the system at nanoscale has been followed, using in tandem, by parallel and successive UV-Vis and DLS measurements, while the structure, size and shape of final nanoparticles obtained have been demonstrated by TEM image analysis. Kinetic studies have been also performed in order to follow the evolution of nanospecies during irradiation procedure. A new, clean, cost effective and rapid method for the synthesis of stable spherical gold nanoparticles (AuNPs) is developed. Keywords: gold nanoparticles, photoreduction, microemulsion, size controlled

Issue: 2013, Volume 64, Issue 7

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