Nano-sized Architectures Of Metals And Semiconductors And Their Charaterizations

CdS nanoparticles were assembled on smooth silver surface by using 1,4-benzenedithiol as coupling molecule. SEM and resonance Raman spectroscopic characterizations demonstrate that the nanostructure of CdS was preserved upon assembly, and a two-dimensional structure of CdS nanoparticles was formed on the substrate surface. FT-Raman spectra indicate that 1,4-benzenedithiol was coupled between CdS nanopartieles and silver surface with a tilted orientation. The Raman scattering of 1,4-benzenedithiol was substantially enhanced by the assembled CdS nanoparticles. Gold and silver nanoparticles were assembled on glass by absorbed inorganic molderPolystylene nanoparticles of diameter 500nm was made by emulsion polymerization. After evaporation of solvent water, an ordered structure of polystylene nanoparticles can be spontaneously generated on a solid substrate, forming particle monolayer or multiplayer, which provide the template for metal deposition. Gold nanoparticles(-15nm) can be filled into the opened space formed among polystylene nanoparticles. As a result, gold nanoparticles were assembled in a patterned manner by using an assembly of polystylene nanoparticles as a template. A "doughnut" type of assembled structures of gold nanoparticles was formed at the bottom of the polystylene nanoparticles. With a similar polystylene nanoparticle template, silver metal was chemically deposited to form an inverse opel nanostructure. Various factors that affect the formation of silver inverse opel nanostructure were investigated. A mechanism for the formation of the nanostructure was proposed. Surface-enhanced Raman spectra of 1,4-benzenedithiol on the nanostructure as well as silver mirror demonstrate that the focusing effect of nanostructure for the electromagnetic field contributes to the further enhancement of the Raman scattering of adsorbed organic molecules.