Seedless synthesis of gold nanorods employing isopropyl radicals generated using gamma radiolysis technique
by Jayashree Biswal, S.P. Ramnani, Seema Shirolikar, S. Sabharwal
International Journal of Nanotechnology (IJNT), Vol. 7, No. 9/10/11/12, 2010

Abstract: The one step synthesis of short aspect ratio gold nanorods using gamma radiation method by incorporating cetyltrimethyl ammonium bromide (CTAB) as a directing agent is reported in this communication. In present method of synthesis, isopropyl radical is selectively generated in the system by carrying out radiolysis of aqueous solution containing 2.75 × 10⁻² mol dm⁻³ of acetone, 0.2 mol dm⁻³ isopropanol, 4 × 10⁻⁴ mol dm⁻² Au¹⁺ and 6 × 10⁻⁵ mol dm⁻³ Ag⁺. The isopropyl radical brings about the reduction of Au¹⁺ to Au⁰, which undergoes coalescence with other Au⁰ resulting in formation of Au nanorods. The formation of nanorods is attributed to slower reaction of isopropyl radical with Au¹⁺. The TEM of as-prepared nanoparticles confirmed the formation of uniform sized nanorods having aspect ratio 3.

Online publication date: Tue, 17-Aug-2010

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