Abstract

Glass-ceramics containing Au nanoparticles have been synthesized by selecting the base glass with specic composition 30Li2O–70B2O3 - x HAuCl4.3H2O [LBA] (x=0.01-0.06) all in wt % have been prepared by conventional melt quenching technique. The characteristic ruby color has been observed which is attributed due to the surface plasmon resonance of the Au nanoparticles uniformly embedded in the glass matrix. The imparted red color due to the presence of gold nanoparticles has been conrmed by studying the optical absorption spectra using UV-VIS spectrometer in the visible range (400-1000nm) which show a characteristic absorption peak at ~560nm. In order to check the crystallization/amorphous nature, the samples were powdered and characterized using XRD. The microstructural modications in the samples due to the addition of Au have been recorded using SEM. Further, the ESR studies reveal that the electronic state of gold is either Au0 or Au+. AC conductivity studies have been performed at RT over a frequency range 100 to 10MHz. AC conductivity data is tted by Almond-West law with power exponent 's'. The dc conductivity is found to be increasing with the increase of temperature for a typical ruby glass, but almost constant with dopant concentration

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