臺灣博碩士論文加值系統

　　本論文之研究包含兩部分，第一部分為利用高分子合成方法製備出銀奈米立方體，在不同反應時間下得到不同尺寸奈米銀立方體在大面積銀表面之研究，透過不同拉曼光譜激發光波長發現平均粒徑為53.7奈米的銀奈米顆粒在激發光波長為633奈米比平均粒徑為72.06奈米的銀奈米立方體有更佳的Raman 增顯因子；反之，平均粒徑為72.06奈米之銀奈米顆粒在激發光波長為780奈米有比平均粒徑為53.7奈米之銀奈米顆粒有更佳的Raman 增顯因子；相較而言，在激發光波長為532奈米時，兩者的Raman 增顯因子有相似的結果。藉由紫外光/可見光光譜分析得知，在532奈米激發光波長下，因兩者之表面電漿共振波長位置都離其太遙遠，導致再Raman結果上並無差異；當激發光波長為633奈米時，平均粒徑為53.7奈米之銀奈米顆粒表面電漿共振波長位置：673奈米較靠近激發光波長633奈米因此有較佳之Raman增顯效果；當激發光波長為780奈米時，平均粒徑為72.06奈米之銀奈米顆粒表面電漿共振波長位置：715奈米較靠近激發光波長780奈米因此有較佳之Raman增顯效果。表示銀奈米立方體存在所對應之特定激發光波長進而達到拉曼增顯效應最大化。
　　論文的第二部分為利用模擬方式了解銀奈米立方體於大面積銀表面於固定激發光波長下電場分布情形。結果顯示，當銀奈米立方體與銀表面之間存在空氣作為介電物質時，間隔層區域會產生強大的電場能量。因銀奈米立方體之尺寸效應會使表面電漿共振波長有所差異，導致在固定激發光波長下電場能量分布不同，在激發光波長為532奈米時，50奈米與70奈米之銀奈米立方體有相似之電場分布情況；當激發光波長為633奈米時，50奈米比70奈米之銀奈米立方體有更強大電場能量；當激發光波長為780奈米時，70奈米比50奈米之銀奈米立方體有更強大電場能量，此趨勢與前部分實驗結果相符，在固定激發光波長下，銀奈米立方體之尺寸具備選擇性以達到最大之電場能量分布。再藉由等效長度探討外漏場的長度，使待測物無須擴散到微小的間隔層內。
　　本研究提供了基本的觀念與結果為銀奈米立方體存在所對應之特定波長以達到最大化之拉曼增顯效果，再藉由模擬方式分析電場分布情形，在未來製備新穎與高效能之基板時，提供了先以模擬方式快速粗略預測實驗結果以節省掉try＆error的時間。

This research describes theoretical and experimental evaluations of electromagnetic fields around metallic nanostructures, such as separated by nano-scale distances. Nanostructures having different sizes and shapes were evaluated. The localized surface plasmon resonance (LSPR) of a nanoplasmonic particle is often considered to occur at a single resonant wavelength. However, the physical measures of plasmon resonance, namely the far-field measures of scattering, absorption, and extinction, and the near-field measures of surface-average or maximum electric field intensity, depend differently on the particle size, and hence may be maximized at different wavelengths. In this work, polyvinylpyrrolidone (PVP)-capped silver nanocubes (AgNCs) were synthesized using ethylene glycol as solvent and reducing agent through a simple, one-pot solvothermal method at 150°C. The SERS profiles obtained here serve as a basis to select silver nanocubes of specific size and composition with maximum SERS efficiency at their respective excitation wavelengths. Their potential for use as a versatile Raman signal amplifier was investigated experimentally using Rhodamin 6G as a probe molecule and theoretically by the three-dimensional finite difference time-domain (3D-FDTD) method. Furthermore, this approach offers a reliable prediction to involve the research about SERS substrates.

中文摘要　I
英文延伸摘要　III
誌謝　IX
目錄　XI
圖目錄　XIII
表目錄　XVI
符號　XVII
第一章 緒論　1
1-1. 表面增強拉曼散射　1
1-1-1. 拉曼光譜原理　1
1-1-2. 表面增強拉曼散射理論　2
1-1-3. 奈米材料的特性與其應用　6
1-1-4. 銀奈米立方體的特性與其應用　9
1-1-5. 銀奈米金屬的尺寸效應　10
1-1-6. Rhodamine 6G待測物應用於表面增強拉曼散射與其效果　11
1-1-7. 表面增強拉曼散射的發展　12
1-2. 金屬表面電漿　14
1-2-1. 金屬平面的表面電漿共振　14
1-2-2. 激發表面電漿的形式　14
1-2-3. 侷域性表面電漿共振　16
1-2-4. 奈米粒子-介電質-金屬結構　16
1-3. 電場模擬：有限時域差分法(FDTD) 18
1-3-1. 馬克斯威爾方程式簡介[49] 18
1-3-2. Yee網格與方程式離散化 20
1-3-3. 吸收邊界 21
1-3-4. 等效長度 22
1-4. 研究動機 23
第二章 銀奈米立方體之尺寸效應於大面積銀表面之拉曼光譜分析 30
2-1. 銀奈米立方體合成 31
2-1-1. 製備銀奈米立方體 31
2-1-2. 穿透式電子顯微鏡量測 32
2-1-3. 雷射光散射粒徑測定儀 33
2-1-4. 表面電漿共振波長分析 34
2-2. 銀奈米立方體之尺寸效應於不同激發光波長下拉曼特性分析 37
2-2-1. 大面積銀基板之製備 37
2-2-2. 銀奈米立方體利用噴霧型方式組裝於大面積銀表面 38
2-2-3. 不同激發光下拉曼光譜分析 39
2-2-4. 環境介電常數對於奈米粒子－介電質－金屬結構之影響 47
2-3. 結論 49
第三章 銀奈米立方體與不同激發光波長之模擬分析 61
3-1. 銀奈米立方體於銀表面間距層模擬分析 62
3-1-1. 間距層模擬分析 62
3-1-2. 模擬與表面粗糙度之結果與討論 64
3-2. 不同尺寸之銀奈米立方體於銀表面吸收圖譜模擬分析 66
3-2-1. 模擬結構條件與設定 66
3-2-2. 模擬之結果與討論 68
3-3. 不同尺寸銀奈米立方體於銀表面在固定激發光下之模擬分析 69
3-3-1. 模擬結構條件與設定 69
3-3-2. 模擬之結果與討論 71
3-4. 表面電漿子結構對等效長度之影響 74
3-4-1. 計算結果與討論 74
3-5. 結論 77
第四章 總結與建議 88
4-1. 總結 88
4-2. 未來工作建議 89
參考文獻 90

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