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Fabrication and Optical Properties of Silver Nanostructures and Their Composites

Author: WuZhiPei
Tutor: FuXiuLi
School: Beijing University of Posts and Telecommunications
Course: Optics
Keywords: Nano materials Ag nanocube Ag@CdS Ag@Ag2Se nonlinear optical Z-scan
CLC: TB383
Type: Master's thesis
Year: 2013
Downloads: 15
Quote: 0
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Abstract


Silver nanoparticles have a wide variety of optical response, in recent years which have attracted scholars for their research. Based on their the surface plasmon response, it has a novel application of light detectors, sensors, optical waveguides and surface-enhanced Raman scattering. One of the most attractive features of silver nanoparticles optical response is local field enhancement, especially the local field enhancement play a vital role on the nonlinear optical properties. Single silver nanoparticles with localized surface plasma is affected by the surrounding medium. Constructing nanocomposites can get more pronounced nonlinear response of metal and non-linear medium, which has become a hotspot currently.The first chapter is an introduction of fundamental concepts and research method on synthesis and optical properties of metal nanomaterials. The significance of our work is also introduced.In Chapter2, introduce important device used in this work. The devices for synthesis experiments include oil bath pot, water bath and drying oven. Introduce Z-scan technology which is most important tool to study third-order nonlinear characteristics of materials. We follow the Z-scan system design to use femtosecond lasers to build our own Gaussian beam Z-scan system.In Chapter3, synthesis the Ag@SiO2nanowires. Study optical waveguide characteristics of Ag@SiO2nanowires and Ag@SiO2nanowire with silver film. Analysis the characteristics of the the nanowire field strength distribution.In Chapter4, use AgCF3COO as silver source to synthesis silver nanocube. Thus synthesis Ag@CdS core-shell nanoparticles by using the silver nanocube. Ag@CdS core-shell structure nanoparticles were characterized by using SEM, TEM and other means. Study the nonlinear absorption and refraction of Ag@CdS core-shell nanoparticles and pure CdS nanoparticles by using Z-scan system. In Chapter5, synthesize Ag@Ag2Se composite nanowires. And the Ag@Ag2Se composite nanowires were characterized by using SEM, TEM and other means. Z-scan system is used to study the nonlinear absorption and refraction of Ag@Ag2Se composite nanowires. Analyzed and discussed the impact of the ratio of Ag and Ag2Se on composite nanowire nonlinear absorption and refraction.In Chapter6, the summary of this work is proposed, and the Further research work is prospected.

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