Synthesis And Optical Properties Of Ag Nanostructures

Silver nanomaterial, one of the most active research fields in the metal nanometer materials, has a wide range of applications because of its unique heat, light, electricity and magnetism, catalysis and sensitive features.This dissertation is about synthesis and optical properties of Ag nanostructures with various morphologies. It discussed the methods and experiment details:First, the well-known ethylene glycol reduction method with polyvinylpyrrolidone (PVP) as surfactant was used to prepare Ag nanostructures with various morphologies. Second, the shape-controlled synthesis of Ag@SiO2 using stober method is described. And then, we develop two different methods for synthesizing Ag@SiO2@Ag. As an extension of our work, we discuss the designing and exploring experiment of self-assemble of nanostructures.The structure and optical properties of the as-prepared Ag nanostructures were investigated in detail; and the waveguiding properties of a single Ag nanowire were studied experimentally and theoretically. The results indicate that Ag nanowires are an effective waveguiding cavity, and the light can propagate through the nanowire from one end to another end with the assistance of surface plasmon resonance.We also investigate the structure and growth process of Ag@SiO2 by using the scanning electron microscope(SEM) and Transmission electron microscope (TEM). At the same time, we study the optical properties of this kind of structure by the analysis of its UV-vis absorption spectra.At last, we compare the result of the Ag@SiO2@Ag nanocables synthesizing by two different method, and discuss some details about it by using TEM.