摘要
奈米銀微粒在高壓下的相變已被研究證實，但奈米微粒的形狀與高壓
的關係較少被探討。因此本論文利用X-Ray繞射角度擴散分析，來探討不同形狀的奈米銀微粒(Silver Nanoparticles)與壓力的關係，實驗樣品為奈米銀微粒的四種形狀五個樣品，有三角形奈米片，正立方體，十面體，球體；其中三角形奈米片分別有兩種厚度.
藉由分析比較5個樣品結構隨壓力的變化, 發現(111)和(200)晶格面所受壓力產生的扭曲程度不同，並在~3GPa之前產生晶體結構的相變.且銀三角形奈米片和銀奈米球體在8GPa前，具有面心立方結構 (face-cencerted
cubic,fcc ) 和六方緊密堆積結構 (hexagonal closed packed,hcp)結構共存，銀
奈米十面體則在1.24GPa後，其與fcc共存的fct(face centered tetragonal）結
構消失。

Abstract
Phase transition and structural distortion of silver nanoparticles under high pressure has been studied in recent years. However, there are fewer reports and
discussions on the shape of the Silver nanoparticles under high-pressure. This thesis work on five samples of four shapes of the silver nanoparticles under high pressures up to 10~12 GPa at room temperature by using Angle-Dispersive X-Ray Diffraction (ADXRD). The shapes of samples are cubes, triangular nano-chip, decahedral and sphere. Two samples of different thickness for triangular nano-chip are used.
The analysis results show that structural distortion of (111) and (200) lattice plane of different shapes of nanoparticles varies with the increasing of pressure. With increasing pressure to around 8GPa, fcc (face-centered cubic structure) and hcp (hexagonal closed packed) structures coexist in samples of triangular nano-chip and sphere. And fct (face-centered tetragonal ) structures of
decahedral disappeared after 1.24GPa.

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