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BULK SYNTHESIS OF SILVER NANORODS IN POLY(ETHYLENE GLYCOL) USING MICROWAVE IRRADIATION
Citation:
VARMA, R. S. AND M. N. NADAGOUDA. BULK SYNTHESIS OF SILVER NANORODS IN POLY(ETHYLENE GLYCOL) USING MICROWAVE IRRADIATION. Presented at 41st Annual Microwave Symposium Program, Vancouver, BC, CANADA, August 01 - 03, 2007.
Impact/Purpose:
To inform the public.
Description:
Microwave-assisted (MW), surfactantless, greener approach to bulk synthesis of silver nanorods employing poly (ethylene glycol) (PEG) is described. An aqueous solution of silver nitrate (AgNO-3,- 0.1 M, 4 mL) and 4 mL of PEG (molecular weight 300) were mixed at room temperature to form a clear solution in a 10 mL test tube. The reaction mixture was irradiated in CEM microwave cavity maintaining a temperature of 100 0C for few minutes with a maximum pressure of 280 Psi. The resulting precipitated silver nanorods were then washed several times with water to remove excess of PEG. Control experiments were conducted in an oil bath at 100 0C for one hour. The formation of silver nanorods occurs in PEG upon irradiation of a solution of aqueous AgNO3 in PEG. The expedited generation of silver nanorods or nanoparticles occurs as the presence of hydroxyl group in PEG couple with microwaves and results in precipitation of silver nanoparticles or nanorods depending upon the concentration reaction mixtures used. The ensuing nanostructures were then characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy (IR), X-ray mapping and energy dispersive analysis (EDX).