十二分支金奈米顆粒合成與生長機構探討

Gold Nanostructure With Twelve Tips : Fabrication Route and Growth Mechanistic Investigations

馮忠彥(June-Yen Feng)

指導教授 ： 黃國柱

國立清華大學/理學院/化學系/碩士(2014年)

https://doi.org/10.6843/NTHU.2014.00256

摘要

在本論文研究中，我們利用自行合成之單十四烷基溴化鄰二氮菲做為合成奈米金顆粒之界面活性劑，且成功以此界面活性劑製備出12分支之奈米金顆粒。主要是以二十面體之對稱在頂點長出十二隻分支，且其邊角具有{711}高晶面，並觀察在不同的反應條件下，對多分支奈米金顆粒結構所造成的影響。推論出多分支奈米金顆粒可能的生長機制為小尺寸奈米顆粒成核後，聚集成孿生晶種，並且逐漸形成二十面體奈米金顆粒，並在界面活性劑模板的作用下，逐漸成長出十二分支。另外在表面增強拉曼散射之實驗，其訊號提升效果遠大於球狀金奈米粒子和金奈米棒，表示此多分支奈米顆粒結構為一可應用在表面增強拉曼散射實驗上之良好基材。總體而言，我們發展了一製備金奈米結構之新方法，且製備出之金奈米結構具有良好的近紅外光吸收及大幅提升拉曼訊號等特性，因此我們預期此材料在生醫應用上會有不錯的表現

關鍵字

金奈米結構 ； 表面增強拉曼散射 ； 生醫應用

並列摘要

In this study, we synthesized a new tetradecylphenanthroline bromide based surfactant and further used it in the development of gold nanostructure with twelve tips and edges with {711} facet.
In order to study the plausible mechanism of gold twelve tips nanostructure, we adopted different reaction conditions. Our results clearly show that, in the presence of tetradecylphenanthroline bromide surfactant and adsorbate can promote the formation of multi-twinned seeds grown into icosahedral structure. During the course of the reaction time, the growth of the gold atoms was facilitated through the vertices of icosahedral structure and finally promoting the formation of gold twelve tips nanostructure.
The gold twelve tips nanostructure possess superior optical properties, such as, excellent and broad NIR absorption, higher extinction coefficients and “lightening rod” effect. Based on these properties, we performed Surface Enhanced Raman Scattering (SERS) application. On comparison to the spherical gold nanoparticle and gold nanorod (Au NRs), the SERS signal of gold twelve tip exhibited dramatic signal enhancement. Overall, our study has proposed a new method to fabricate gold nanostructure with superior optical and SERS properties, which explores its applications in the field of biomedicine.

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