Formation of Ag aggregate on glass substrates using the microwave induction heating

The glycerol solution of AgNO3 was irradiation by the microwave of 2.45GHz frequency from a commercial microwave oven. By the irradiation of microwave, the temperature of the reaction solution increased up to above the boiling point of glycerin. After ceasing irradiation, the color of the solution turned to yellow, and the fine silver particles were formed. From the XRD analysis, it was found that the resulting Ag fine particles are crystalline. It was shown that the glycerin efficiently reduced AgNO3 to Ag in the microwave irradiation process. The sample after the irradiation showed the absorption in the visible wavelength region which originated from the plasmon excitation of Ag fine particle. From the laser scattering measurements, the Ag fine particles with the mean size of similar to 100nm were also found in the supernatant solution after the centrifugal separation. The SEM observations showed the formation of Ag aggregate of unequal size from 100nm to 500nm in the case of Ag plating on the glass substrate.