臺灣博碩士論文加值系統

利用變溫下金奈米團簇的光激螢光以及光激螢光激發光譜提出一個與分子相關的模型來解釋金奈米團簇在不同溫度下的發光機制。在不同溫度下，金奈米團簇光激螢光光譜為兩個能量訊號的疊加，而隨著螢光能量位置不同，光激螢光激發光譜亦有兩個能量峰值的消長，這些現象可由分子模型來解釋。

另外，利用變溫下的電流－電壓曲線與變溫下的光激螢光光譜來討論金奈米團簇的螢光與導電機制。在變溫下金奈米團簇表面載子可能有兩種行為的轉換，一為受入射光源激發產生電子電洞的復合放光，另一為載子在金奈米團簇碳鏈間跳躍傳遞。再以HOMO-LUMO gap模型來描述變溫下金奈米團簇載子復合放光與導電的行為。並且發現在160K時，金奈米團簇有金屬到絕緣體轉換的現象。

We studied the temperature dependence of photoluminescence (PL) and PL excitation in gold nanoclusters. A molecular model to explain the temperature dependence of PL in gold nanoclusters has been proposed. In different temperatures, the PL is composed of two signals. With different excitation wavelengths, the wavelengths of PL charge accordingly. These phenomenon can be explained by the molecular model.

In addition, we studied temperature dependence of current-voltage characteristics and PL in gold nanoclusters. In different temperatures, the carriers of gold nanoclusters may have two behaviors: one is the electron-hole pair recombination, the other one is the carrier hopping in C-chain of gold nanoclusters. We use the HOMO-LUMO gap model to explain the temperature dependence of PL and electronic transport in gold nanoclusters. In 160 K, the metal-to-insulator transition occurs in the gold nanoclusters .

目　錄
摘要----------------------------------------------------------------------------------------I
Abstract-----------------------------------------------------------------------------------II
致謝--------------------------------------------------------------------------------------III
目錄------------------------------------------------------------------------------------- IV
圖表目錄--------------------------------------------------------------------------------VI
第一章 緒論-----------------------------------------------------------------------------1
第二章 樣品介紹-----------------------------------------------------------------------7
2-1金奈米團簇之製備----------------------------------------------------------------7
2-2金奈米團簇之結構------------------------------------------------------8
第三章 實驗原理與系統架設------------------------------------------------------10
3-1光激螢光光譜原理與量測系統
(Photoluminescence：PL)--------------------------------------------10
3-2時間解析光激螢光原理與量測系統
(Time-Resolved Photoluminescence：TRPL)---------------------12
3-3電壓-電流曲線特性量測----------------------------------------------14
第四章 結果與討論------------------------------------------------------------------16
4-1光激螢光與光激螢光激發光譜-------------------------------------16
4-1.1室溫下金奈米團簇與前驅物的光激螢光光譜-----------------16
4-1.2 12K下不同激發光能量的光激螢光光譜-----------------------18
4-1.3 12 K與210 K下隨螢光峰值能量變化的光激螢光激發光譜--------------------------------------------------------------------------21
4-1.4金奈米團簇的發光機制--------------------------------------------25
4-2 隨溫度變化的電性與光性機制-------------------------------------27
4-2.1變溫下的電性--------------------------------------------------------27
4-2.2變溫的光激螢光光譜-----------------------------------------------31
4-2.3螢光金奈米團簇螢光及導電機制--------------------------------34
第五章 結論---------------------------------------------------------------------------37
參考文獻--------------------------------------------------------------------------------39

圖表目錄
圖2-1.1奈米金團簇合成示意圖-----------------------------------------------------7
圖2-2.1金奈米團簇之結構示意圖--------------------------------------------------8
圖2-2.2金奈米團簇之TEM圖-------------------------------------------------------9
圖3-1.1半導體光激螢光原理示意圖----------------------------------------------10
圖3-1.2光激螢光光譜量測系統架設示意圖-------------------------------------11
圖3-2.1光激螢光激發光譜量測系統之示意圖----------------------------------13
圖3-3.1電性量測樣品製備示意圖-------------------------------------------------14
圖3-3.2金奈米團簇電子傳導示意圖----------------------------------------------15
圖4-1.1室溫下金奈米團簇(紅線)以及前驅物(黑線)的光激螢---------------17
圖4-1.2金奈米團簇在12 K下，隨激發能量變化的光激螢光光譜圖------18
圖4-1.3金奈米團簇在12 K下，隨激發光能量變化的擬合趨勢--------------19
圖4-1.4金奈米團簇在12 K下的發光模型---------------------------------------20
圖4-1.5金奈米團簇在12 K下，隨螢光峰值能量變化的激發光光譜圖----21
圖4-1.6金奈米團簇在12 K下，激發光光譜擬合數據--------------------------22
圖4-1.7金奈米團簇在210 K下，隨螢光峰值能量變化的激發光光譜------23
圖4-1.8金奈米團簇在210 K，下激發光光譜擬合數據------------------------24
圖4-1.9金奈米團簇在12 K下，吸收與放光機制示意圖---------------------25
圖4-1.10金奈米團簇在210 K下，吸收與放光機制示意圖--------------------26
圖4-2.1不同溫度下金奈米團簇的電流電壓曲線圖----------------------------27
圖4-2.2金奈米團簇的電阻率隨溫度特性變化----------------------------------28
圖4-2.3金奈米團簇的電阻率隨溫度變化的擬合結果------------------------30
圖4-2.4金奈米團簇隨溫度變化的光激螢光光譜圖----------------------------31
圖4-2.5金奈米團簇(a)低螢光能量峰值(b)高螢光能量峰值 強度隨溫度變化趨勢圖---------------------------------------------------------------------------------32
圖4-2.6金奈米團簇(a)低螢光能量峰值(b)高螢光能量峰值 位置隨溫度變化趨勢圖---------------------------------------------------------------------32
圖4-2.7金奈米團簇(a)低螢光能量峰值(b)高螢光能量峰值 半高寬隨溫度變化趨勢圖------------------------------------------------------------------33
圖4-2.8金奈米團簇載子傳遞示意圖----------------------------------------------34
圖4-2.9溫度低於160 K時，金奈米團簇螢光與導電機制示意圖------------35
圖4-2.10溫度高於160 K時，金奈米團簇螢光與導電機制示意圖----------36

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