Abstract
A bi-functional nanocomposite thin film containing Ag nanoparticles embedded in fullerene C70 is synthesized by thermal co-evaporation technique. Tuning of plasmonic resonance of Ag-C70 nanocomposite is obtained by annealing the nanocomposite thin film at different temperatures from 80 to 300°C for 30min. The optical and structural properties of nanocomposite thin film with respect to high temperature are studied by UV–visible absorption spectroscopy and X-ray diffraction. Transmission electron microscopy is performed to investigate the temperature dependent size evolution of Ag nanoparticles in fullerene C70 matrix. Growth of Ag nanoparticles is observed with increasing temperature above 200°C due to enhanced diffusion of Ag in fullerene C70 and Ostwald ripening. The optical and structural properties of metal-fullerene nanocomposite is not significantly affected upto a temperature of 150°C, after that a progressive blue shift of ~27nm in SPR wavelength is observed with increasing temperature. The tuning of SPR is ascribed to the thermal induced structural transformation of fullerene C70 matrix into amorphous carbon and also to mutual polarization of the particles.
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