一、水相加熱法合成極小三角金奈米片狀結構 二、以植晶法製備具雙錐狀金奈米結構及其形狀轉換成多分支楊桃狀金奈米粒子

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

陳秋樺(Chiu-Hua Chen)

指導教授 ： 黃暄益

國立清華大學/理學院/化學系/碩士(2007年)

https://doi.org/10.6843/NTHU.2007.00349

摘要

本篇論文包含兩個不同的研究主題，第一個部份利用水相加熱合成極小的三角片狀結構，而第二部份則是利用植晶法合成出雙錐狀和具五個分支的楊桃狀金奈米粒子。
本篇論文第一部份在水相加熱的系統中，利用氯金酸；檸檬酸鈉(trisodium citrate) 溴化十六烷三甲基銨 (cetyltrimethylammonium bromid) 且同時控制反應物濃度、時間，即可還原合成出極小的三角片狀結構，由於三角片狀結構的大小和形狀相似，導致有2D自組裝的排列現象產生。
本篇論文第二部份藉由傳統植晶法的合成方式，在合成過程中加入硝酸銀，促使產生雙錐狀的金奈米粒子和同時亦可成具五個分支的楊桃狀金奈米粒子。在整個實驗中，改變硝酸銀所加入的量，可以去控制多分支結構的金奈米晶體形狀結構。為了去了解其結構，我們亦做了穿透式電子顯微鏡以及高解析穿透式電子顯微鏡的鑑定。

關鍵字

植晶 ； 奈米粒子 ； 奈米晶體 ； 分支 ； 截面 ； 硝酸銀

並列摘要

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.

並列關鍵字

seeding growth ； branch ； nanoparticle ； nanocrystal ； faceted

參考文獻

(6) Kuo, C.-H.; Huang, M. H. Langmuir 2005, 21, 2012.

(10) Chu, H.-C.; Kuo, C.-H.; Huang, M. H. Inorg. Chem. 2006, 45, 808.

(15) Chu, H.-C.; Kuo, C.-H.; Huang, M. H. Inorg. Chem. 2006, 45, 808.

(12) Zhou, Y.; Wang, C. Y.; Zhu, Y. R.; Chen, Z. Y. Chem. Mater. 1999, 11, 2310.

CHAPTER 1