X-Ray Absorption Spectroscopy and Optical Absorption Studies of the Growth of CdS Nanocrystals in Glass
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ABSTRACT We have measured and analyzed optical absorption, Raman scattering and x-ray absorption spectra of CdS nanocrystals grown by solid-state reaction in a borosilicate glass. We observe the appearance and growth of an optical absorption peak which is attributed to CdS nanoparticles. Using x-ray absorption we quantify the progressive replacement of 0 nearest neighbors of Cd by S with heat treatment and the appearance and growth of a well-defined second nearest neighbor peak. INTRODUCTION Potential applications of nanoparticle semiconductors include nonlinear optical devices for optical computing and communications. It is important for these applications that the inhomogeneous optical absorption linewidth be minimized; the greatest contribution to the linewidth for small particles (diameter
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