Synthesis of Gold Nanorods Using Binary Surfactant System, Surface Modification and Silver-Overgrowth on Gold Nanorods

• Main Authors: Lin, Shih-Yao, 林士堯
• Other Authors: Chen, Chia-Chun
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/f9hp3k

碩士 === 國立臺灣師範大學 === 化學系 === 106 === We discuss the synthesis of gold nanorods(AuNRs) using a binary surfactant system. The size and the aspect ratios of AuNRs with tunable longitudinal surface plasmon resonance can be achieved by altering the synthesis conditions of the seed-mediated growth method. It’s important for investigating the effect of each condition and the growth process of AuNRs. Due to the anisotropy of AuNRs result in a non-uniform distribution of the electromagnetic field. There is a significantly enhancement upon the optical signals (such as fluorescence or Raman scattering light) at the ends of AuNRs. It’s predicable that the fluorescence signals will be enhanced if the fluorescent dye molecules or fluorescent light-emitting gold nanoclusters(AuNCs) placed at the ends of AuNRs. We functionalize the ends of AuNRs with amine-functional thiolate polymer because of carboxyl group contained fluorescent dye molecules and mercaptosuccinic acid-stablilized AuNCs. Linking up amine group with carboxyl group is achievable through EDC/NHS crosslinking. We also present that the deposition of silver atom on the surface of AuNRs forming the cuboidal Au/Ag-core/shell structure (Au@Ag nanocuboids) and then discuss the changing of morphology and the different of absorption spectra. Au@Ag nanocuboids can be further etched by Au(III)-CTAC solution results in a cavity Au rod/Au shell structure (gold nanorattles). It can be predicted if loading the fluorescence materials leads to high electric-field enhancement inside the cavity.