PHYSICS, CHEMISTRY AND APPLICATION OF NANOSTRUCTURES, 1999 METAL AND SEMICONDUCTOR NANOPARTICLES IN SOL-GEL DERIVED SILICA MATRICES

摘要: Fabrication method of silica films and glasses with nanoparticles of copper and copper chalcogenides based on the sol-gel technique is developed. Composition, peculiarities of chemical state, and optical properties of these materials are studied. Films and glasses are proposed as perspective material for non-linear optical applications.Recent development of material science and technology has created a new class of optoelectronic devices consisting of dielectric matrix doped with nanometer semiconductor particles. Semiconductor nanoparticles exhibit the quantum size effects in the electronic band structure that provides a number of new features in linear and nonlinear optical properties [1-3]. The quantum confinement of charge carriers in semiconductor nanoparticles is most readily achieved in narrow-bandgap materials, in which the exciton Bohr radius is large enough. Many works of this topic concern the direct-gap II-VI semiconductors due to diversity of their preparation techniques in different media (colloids, glasses, thin films etc.)[1-3]. Chalcogenides of Ib elements (eg, Cu, Ag) are much less studied, and complicacy of electronic structure and availability of compounds with the different elemental content open new pathways to control optical properties in the wide range: from UV up to near-IR. Chemistry of copper (as well as of other transition elements) requires new approaches for production of nanocomposite materials with its chalcogenides. These metals can form many phases (both crystalline and amorphous) with variable valence and stoichiometry; crystal lattices inherent to them are also different from diamond-like II-VI and III-V …