論文摘要
本篇論文以銀輔助成長的質晶法來合成並且進行金奈米柱的軸徑比控制，在銀輔助成長的質晶法控制下，可以進行軸徑比1.8~5的金奈米柱合成。其中我們選擇了軸向表面電漿共振特徵波峰約750~800nm金奈米柱進行金-硒化鎘奈米柱核殼結構的合成。採用陽離子交換程序下，我們控制了金-硒化鎘奈米柱核殼結構合成中三個主要的階段性包覆合成：(1)金-銀奈米柱核殼結構合成 -> (2)金-硒化銀奈米柱核殼結構合成 ->(3)金-硒化鎘奈米柱殼結構合成。
過程中我們選用了以聚乙烯吡咯烷酮(polyvinylpyrrolidone,PVP)與十六烷基三甲基溴化胺 (C16TAB)做為合成金-銀奈米柱核殼結構主要面活性劑以達到較均勻的銀殼層包覆，並控制其殼層厚度約在3奈米用以進行階段(2)的合成；而在金-硒化銀奈米柱核殼結構合成中，我們選用硒脲作為硒的來源，並控制其劑量維持殼層厚度，最後在高解析度TEM與XRD檢測下確認合成出金-硒化銀奈米柱核殼結構；在階段(3)中我們利用陽離子交換技術使得已形成的硒化銀殼層經交換後形成硒化鎘殼層並藉由再形成的硒化鎘來增加殼層厚度。

Abstract
In this study,we use the silver-assisted method to synthesis gold nanorods and control the aspect ratio. Under this kind of seed-mediated growth, we can tune the aspect ratio from 1.8 to 5. Among those gold nanorods we synethsis, we choose gold nanorods with longitudinal surface resonance wavelength between 750nm to 800nm as the seed for synthesizing Au-CdSe core-shell nanorods.In order to adapt cation exchange process, we have to control three major steps：(1)Au-Ag core-shell nanorods synthesis (2) Au-Ag2Se core-shell nanorods synthesis (3) Au-CdSe core-shell nanorods synthesis.
In step (1), To get well coverage of Ag shell, we choose PVP and C16TAB as the ligand for synthsizing Au-Ag core-shell nanorods. As the result, we can control the shell thickness at about 3 nm for next step synthesis. In step(2), we choose selenourea as the source for producing Ag2Se shell,meanwhile in the expect of maintain the shell structure, we also control the amount of selenourea we use. By characterizing with HR-TEM and XRD, we finally confirm the heterostructure we produce is Au-Ag2Se core-shell nanorod. In last step, we perform the cation exchange process for transforming Ag2Se shell to CdSe, also increasing the CdSe shell thickness.

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