臺灣博碩士論文加值系統

我們將本文分成兩部分，第一部分中，利用在不同溫度下的光激螢光激發光譜以及時間解析光激螢光光譜，研究牛血清蛋白金奈米團簇之螢光機制。在載子復合的過程中，我們觀察到本樣品存在著侷限效應，也藉由低溫下時間解析光激螢光光譜以及變溫螢光活化能擬合，求出樣品存在的侷限深度，進而提出牛血清金奈米團簇的發光機制。
第二部分中，我們探討經由快速熱退火的方法，利用外加能量影響團簇本身改變螢光發光強度，藉由時間解析光激螢光光譜實驗，得出載子復合生命期，並推論快速熱退火將對本樣品團簇產生何種影響。

In this thesis, we have two parts to present. In the first one, we investigated luminescence mechanism of Bovine Serum Albumin-coated gold nanoclusters by photoluminescence (PL), and time-resolved photoluminescence (TRPL) experiments at different temperatures. In the carrier recombination process, we observed the confinement effect in our sample. By measuring the TRPL at low temperatures, the activation energy at different temperatures can be fitted. We also obtain localized depth of carriers in our sample, suggesting the luminescence mechanism of AuNCs@BSA. In the second part, we explore the effect of rapid thermal annealing (RTA) on the PL of gold nanoclusters. We obtained the carrier recombination time by the TRPL experiments. PL intensity is enhanced by 1.2 time after rapid thermal annealing.

摘要..........................................................................Ⅰ
Abstract ....................................................................Ⅱ
致謝..........................................................................Ⅲ
目錄..........................................................................Ⅴ
圖目錄........................................................................Ⅶ
表目錄........................................................................Ⅸ

第一章 緒論
1-1 研究背景...................................................................1
1-2 螢光特性金屬奈米團簇.........................................................3
1-3 分子包覆金奈米團簇螢光機制...................................................5

第二章 樣品介紹
2-1 螢光金奈米團簇之製備.........................................................6
2-2 螢光金奈米團簇之結構與基本特性................................................8

第三章 量測系統與實驗原理
3-1 光激螢光光譜量測系統(Photoluminescence，PL).................................11
3-2 時間解析光激螢光光譜量測系統(Time-Resolved Photoluminescence，TRPL ).........13
3-3 快速熱退火系統(Papid Thermal Annealing，RTA)...............................15

第四章 結果與討論
4-1 AuNCs@BSA金奈米團簇之光學特性研究...........................................17
4-1.1 螢光金奈米團簇(AuNCs@BSA)溫度變化光激螢光光譜..............................18
4-1.2 溫度變化時間解析光激螢光光譜...............................................20
4-1.3 活化能及低溫下時間解析光激螢光光譜.........................................26
4-1.4 S-Shape與侷域深度.......................................................30
4-1.5 AuNCs@BSA金奈米團簇螢光機制..............................................33
4-2 快速熱退火對於金奈米團簇光激螢光強度改善之研究.................................35
4-2.1 不同狀態樣品在熱退火溫度下光激螢光強度改變分析...............................35
4-2.2 不同熱退火溫度對於單一樣品光激螢光光譜分析..................................37
4-2.3 時間解析光激螢光光譜量測分析...............................................40

第五章 結論....................................................................43
參考文獻......................................................................44


圖目錄
圖1-1 不同粒徑大小的量子點在單一激發光源照射下之各色光譜圖...........................2
圖2-1.1 AuNCs@BSA螢光金奈米團簇之合成步驟示意圖...................................7
圖2-2.1 AuNCs@BSA螢光金奈米團簇之TEM圖及結構示意圖................................8
圖2-2.2 (a)BSA及AuNCs@BSA分別在可見光及UV光照射下顏色圖...........................9
(b)個別吸收光譜及螢光光譜
圖2-2.3 實際樣品在可見光及UV光源照射下顏色圖......................................10
圖2-2.4 實際製出之AuNCs@BSA在470 nm雷射照射下光激螢光圖..........................10
圖3-1.1 光激螢光原理示意圖......................................................11
圖3-1.2 光激螢光光譜量測系統架設示意圖...........................................12
圖3-2.1 TCSPC示意圖...........................................................13
圖3-2.2 時間解析光激螢光光譜量測系統示意圖…......................................14
圖3-3.1 快速熱退火系統示意圖....................................................16
圖4-1.1 (A)變溫下AuNCs@BSA光激螢光光譜
(B)將光激螢光光譜作分隔處理圖............................................18
圖4-1.2 變溫光激螢光光譜峰值位置與溫度關係圖......................................19
圖4-1.3 不同溫度下的時間解析光激螢光光譜圖........................................20
圖4-1.4 在低溫(15K)時量測螢光峰值之時間解析光激螢光光譜擬合圖......................22
圖4-1.5 不同溫度下時間解析光激螢光光譜擬合圖......................................22
圖4-1.6 載子長時間復合隨溫度變化與變溫峰值位置比對圖...............................23
圖4-1.7 載子變溫過程短時間復合生命期轉以輻射、非輻射復合表示圖......................25
圖4-1.8 載子變溫過程長時間復合生命期轉以輻射、非輻射復合表示圖......................25
圖4-1.9 光激螢光峰值強度對時間倒數及活化能擬合結果.................................26
圖4-1.10 低溫下不同能量位置的時間解析光激螢光光譜圖................................27
圖4-1.11 低溫下不同能量位置時間解析光激螢光光譜擬合結果作圖.........................28
圖4-1.12 低溫下長時間載子復合時間與侷域態擬合結果.................................29
圖4-1.13 S-Shape與Varshni公式擬合結果..........................................30
圖4-1.14 變溫狀態下量測時間解析光激螢光光譜擬合結果................................31
圖4-1.15 AuNCs@BSA螢光發光機制圖...............................................33
圖4-2.1 (A)固體
(B)液體滴乾狀態樣品在不同溫度利用重複熱退火後所量測的光激螢光強度變化比較圖...36
圖4-2.2 樣品螢光強度經過不同熱退火溫度前後比較圖 ..................................38
圖4-2.3 經過不同溫度快速熱退火後螢光增強比例圖....................................39
圖4-2.4 經過RTA 70、150、200及250℃前後時間解析光激螢光光譜比較圖..................40
圖4-2.5 樣品經過200℃熱退火前後擬合圖............................................41


表目錄
表4-1-1 侷域深度、活化能、S-Shape之σ擬合結果比較.................................32
表4-1-2 將S-Shape與Varshni擬合時同時得出的α、β常數與普通尺寸的金結果互相比較........32
表4-2-1 樣品經過200℃熱退火前後擬合結果比較......................................41

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