Growth and dissolution of CdS nanoparticles in glass

We report and analyse x-ray absorption spectroscopy of the Cd K edge of CdS -doped glass during growth and dissolution of CdS nanoparticles. Average pa rticle size is deduced from a combination of x-ray and optical spectroscopi es. We propose a simple thermodynamic model in which the limiting reactant is in only two environments, either dissolved in the glass or in CdS partic les. In this model, the time- and temperature-dependent concentration of Cd dissolved in the glass is related to the total concentrations of Cd and S, the equilibrium solubility of the limiting reactant, and the average CdS p article size.