Abstract
We report the structural and optical properties of Au nanoparticles embedded in a silicamatrix synthesized by atom beam co-sputtering. The presence of surface plasmon resonantabsorption indicates the formation of Au nanoparticles. Transmission electron microscopy(TEM) studies show the presence of Au nanoparticles with an average size ranging from∼1.8 to 5.4 nm with narrow size distributions depending on the relative areas of Au andSiO2. We discuss the process of nucleation and growth of Au nanoparticles in thenanocomposite films formed by co-sputtering. The present method of nanoparticle synthesisis compared with other ion beam based techniques such as ion implantation and ion beammixing. Preliminary experiments for the detection of human ovarian cancer cells usingthese Au nanoparticles are described.
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