奈米金屬顆粒微觀結構變化研究

• Main Author: 徐國棟
• Other Authors: 徐鎮
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/42546063352234334886

碩士 === 國防大學中正理工學院 === 兵器系統工程研究所 === 91 === Au, Ag, Pd, Au-Ag, and Au-Pd nanoparticles were mainly made by the phase transfer method in this study. HREM, SAD, EDAX, AFM, UV/VIS, and DTA/TG were carried out to study the microstructures, optical properties, and thermal stabilities of those nanoparticles. The HREM result shows that Au and Ag nanoparticles dispersed uniformly with single isolated particle, while Pd nanoparticles appeared with clusters. The surface morphologies of Au and Ag exhibited with truncated octahedral, decahedral, and icosahedral shapes through the release of energy of Au and Ag nanoparticles. However, the energy release of Pd induced the formation of heterogeneous structures. Au nanoparticles tended to cluster and the multi-twin particle structures were easily observed in the heating and cooling thermal cycles. The linear relation of optical property was determined by the ratio of Au/Ag bimetallic nanoparticles. XRD and SAD spectrums demonstrated the formation of various structures among those nanoparticles. High-temperature XRD and DTA experimental results constructed the selection phase map of Au/Ag and Au/Pd bimetallic nanoparticle system. Au/Ag bimetallic nanoaprticles melt approximately at 800 oC. There was an unidentified phase formed at a temperature range of 500-540 oC in the Au/Pd ratio of 1/1.9, and melted at 900 oC.