I. Thermal Aqueous Solution Approach for the Synthesis of Ultra-Small Gold Nanoplates II. Controlled Synthesis of Bipyramid-Shaped Gold Nanoparticles by Seed-Mediated Growth and Their Transformation into Star Fruit-Shaped Branched Nanocrystals

• Main Authors: Chiu-Hua Chen, 陳秋樺
• Other Authors: Michael H. Huang
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/25356641564746679457

碩士 === 國立清華大學 === 化學系 === 95 === Thermal Aqueous Solution Approach for the Synthesis of Ultra-Small Gold Nanoplates We report a study on the thermal aqueous solution approach of ultrasmall triangular gold nanoplates with average widths of 40 ± 7 and 58 ± 10 nm. Because of their relatively uniform sizes, these tiny nanoplates can spontaneously self-assemble into some ordered 2-dimensional structures such as the hexagonally arranged pattern. UV-vis absorption spectroscopy showed that these nanoplates exhibit a strong absorption band at 590-602 nm and a weak and broadband centered at ~775-900 nm. Controlled Synthesis of Bipyramid-Shaped Gold Nanoparticles by Seed-Mediated Growth and Their Transformation into Star Fruit-Shaped Branched Nanocrystals We report a study on the synthesis of bipyramid-shaped gold nanoparticles by a seed-mediated approach and their transformation into star fruit-shaped branched nanocrystals by adding a certain amount of Ag+ ions to different solutions in the process. The colloidal of AgCl and AgBr nearby the side surfaces of gold seeds make the growth slowly, and gold atoms deposit at the twin boundaries and led to their unsymmetrical growth, all of which is the source of forming star fruit-shaped branched nanocrystals.