Solid Base Silver Film Materials - Morphology Control And Nature Of The Analysis

Noble metal nanostructures take on surface plasmon resonance (SPR) absorption under irradiation of incident light, thus show various potential applications in the fields of sensing, solar energy absorption, biomedical thermotherapy, local filed enhancement, laser induced inertial confinement fusion and so on. In the fields of sensing, chemical catalysis, solar energy absorption, the number nano-particles are not fixed in liquid. The nano-particles are difficult recovery and reuse, so inconvenient for direct application. The research focuses are to make nano-structure form array column or thin film on the solid phase substrates and to detect the character of nano-structured on substrate. In laser induced inertial confinement fusion, in addition, metal nano-structures need be built on the substrates; the absorption wavelength and the laser wavelength are transferred corresponding; the response of substrate is studied in the harder laser. Therefore, it is necessary to develop an easy way make metal nano-structures grow on solid phase substrates.This thesis deseribes the preparation of noble metal films on solid substrates, morphologieal control and the studies of their properties such as optical, electrical and eatalytic properties. The properties of the films and metal deposition mechanism were investigated by using scanning electron microscopy (SEM), atomic force microsceopy (AFM), UV-Vis spectrophotometer, fluorescence spectroscopy, X-ray diffraction measurement (XRD), Raman spectroscopic analysis, ete. Some important results obtained are deseribed as follows:1. Triangular silver nanoplates on the surface of glass substrate have been synthesized by small triangular silver nanoplate seeds with the assistance of Tannin. Silver nanoparticles aggregates adsorbed on glass substrates were in-situ prepared under irradiation of a fluorescent lamp after the substrates were silanized and attached with metal seeds. A new strong band appeared in the absorption spectra of the substrates due to the interparticle dipole-dipole coupling of SPR response of the silver particles. The change of this band with irradiating time and the influence of different seeds and reacting conditions on the morphology and absorption properties of the silver structrures on the substrates were studied.2. The novel silver nanoparticles were successfully synthesized by a novel electroless plating approach on glass substrate. The formation of silver nanoparticles was attributed to the molar ratio of AgNO3 and complexing agent and the influence of reaction temperature. The SERS activity of the substrate degree on the effect of surface morphology of silver nanoparticles.3. The different morphology of thin films of silver nanoparticles has been synthesized by using the copper active substrate with different types of complexing agents at the same experimental conditions. Ag/Au Bimetallic Nanostructures have been synthesized by using the Ag dendrites on the Cu substrate as active substrate with multi-stage replacement at the same experimental conditions. The SERS activity of the Ag/Au Bimetallic Nanostructures was studied.