Preparation of Ag/Pd alloy nanoparticles and surface modification on Au nanoparticles

• Main Authors: Yao-Hung Tseng, 曾耀弘
• Other Authors: Chen-Sheng Yeh
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/286d8b

碩士 === 國立成功大學 === 化學系碩博士班 === 90 === 　　Nanomaterials has attracted wide spread interest due to their size and composition dependent chemical and physical properties. Two exper- iments have been performed including (1) the synthesis of Ag / Pd alloy nanoparticles and (2) the modification of gold nanoparticles. (1) Preparation of Ag / Pd alloy nanoparticles by laser irradiation： 　　Laser irradiation of colloidal mixtures of Ag / Pd was conducted to synthesize Ag / Pd alloy nanoparticles. Compositional ratios of 1:1 and 2:1 were prepared in Ag / Pd system. The compositions , the particle sizes , and the morphology were measured as a function of laser irradiation period in order to monitor the changes from two component mixtures into the alloy colloids. The average particle sizes of Ag / Pd with the 1:1 and 2:1 metal ratios were 7.3 ± 2.0 nm and 5.4 ± 2.0 nm . In addition to EDX analysis, X-ray diffraction measurements were carried out to confirm the formation of the alloy nanoparticles. (2) Modification of Protoporphyrin Ⅸ Zinc (Ⅱ) on Au nanoparticles： 　　Gold nanoparticles and protoporphyrin Ⅸ zinc (Ⅱ) (ZnPP) mixtures(18.2 % H2O and 81.8% DMF) with molar ratios of 1 : 1 , 1 : 3 , 1: 6 and 1: 10 were prepared. The XPS analysis displayed the ZnPP successfully attached on the gold nanoparticles. On the basis of the FT-IR results , it is possible that the electrostatic attraction is dominant between the Au colloids and porphyrins. Self – organization was observed for the porphyrins functionalized Au particles from the TEM images. Interestingly , the radial structures were developed with the molar ratio of 1: 3 (Au：ZnPP). However , the linear arrangements appeared for the molar ratios of 1: 6 and 1: 10 (Au：ZnPP). Formation of porphyrins H- aggregation resulting in the self-organization of the Au nanoparticles has been proposed and discussed.