Fabrication of Gold Nanoparticle Film with Centrifugal Method and the Relationship between its Formation and Colloidal Interaction

• Main Authors: Su-Ching Yang, 楊素卿
• Other Authors: Shien-Der Tzeng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/53295901469205837918

碩士 === 國立東華大學 === 應用物理研究所 === 98 === In this work, we successfully demonstrate a novel centrifugal method to rapidly fabricate large area, uniform gold nanoparticle films. Mono-disperse 12 nm colloidal gold nanoparticles were modified with 11-Mercaptoundecanoic acid (MUA). The interaction between the MUA-modified gold nanoparticles was controlled by the pH value and the ionic strength of the colloidal solution. We find that the coverage of gold nanoparticles very depends on the energy barrier between gold nanoparticles in the colloidal solution. When the energy barrier is larger than 9 kBT, the nanoparticles were individually adsorbed on the surface of 3-Aminopropyl-trimethoxysilane (APTMS) modified substrate, and the coverage increases with the decrease of the energy barrier. As the energy barrier is about 12 kBT, the gold nanoparticle film has the maximum fractional coverage of about 73%. When the energy barrier is smaller than 9 kBT, the nanoparticles aggregated in the colloidal solution before their deposition on the surface. When the energy barrier is between 6 kBT and 9 kBT, the gold nanoparticles in the colloidal solution form loose clusters, and the coverage decreases with the energy barrier. As the energy barrier is about 6 kBT, the gold nanoparticle film has the minimum fractional coverage of about 14%. When the energy barrier is lower than 6 kBT, the gold nanoparticles form tighter clusters, and the coverage becomes higher with the decrease of the energy barrier.