臺灣博碩士論文加值系統

本研究利用光媒介誘導合成法，在綠色LEDs的激發下所合成銀奈米三角平板，之後改以紫色LEDs進行照射，發現會有光致型態轉換的現象，消光光譜的最大波峰會由原本的600 nm隨時間逐漸位移至440 nm，TEM影像顯示出所對應不同階段的產物型態轉換，不同於過去文獻報導只是三角平板變成圓盤，還會產生二十面體及類球形，同時具溶液會有強烈的散射，散射波峰位於500 nm。水浴溫度會影響型態變化的所生成的二十面體粒子大小，5℃時奈米粒子的為直徑42.3 ± 4.7 nm，溫度升高到80℃奈米粒子直徑為73.6 ± 8.6nm。同時，在通入氬氣除氧之後則無法進行型態轉換，證明氧氣在型態轉換的過程是必須的要件，而藍色與綠色的光致型態轉換不會出現平板以外的型態，只有紫光會產生平板以外的型態。將三角平板改為熱合成法後進行紫光型態轉換，型態與光媒介誘導合成相同，但可以得到直徑約130 nm的奈米粒子。在CV的SERS光譜量測中，我們發現並非散射能力越大的奈米粒子就有較強的表面增強效益。

第1章 緒論 1
1-1 奈米科技簡介 1
1-2 奈米材料特性 2
1-3 表面電漿子共振 7
1-4 銀奈米粒子 10
1-5 奈米粒子的合成方式 14
1-6 研究動機 23
第2章 實驗 25
2-1 光合成裝置 25
2-2 分析儀器 27
2-3 實驗藥品 29
2-4 實驗方法 30
第3章 結果與討論 33
3-1 三角平板奈米銀的合成 33
3-2 三角平板奈米銀的型態轉換 46
3-3 藍色與綠色的LEDs對型態轉換的影響 56
3-4 反應溫度對型態轉換的影響 62
3-5 化學合成法的三角奈米銀在紫色LEDs的型態轉換 70
3-6 奈米粒子的散射與SERS 80
第4章 結論 85
參考文獻 86

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