金奈米團簇的位置選擇性光激螢光之研究

Study of site-selective photoluminescence in gold nanoclusters

劉健宏(Chien-Hung Liu)

指導教授 ： 沈志霖

中原大學/理學院/物理研究所/碩士(2012年)

https://doi.org/10.6840/cycu201200341

摘要

我們對金奈米團簇的光激螢光光譜進行研究，在激發光能量從2.1eV 下降至1.6 eV 時，光激螢光光譜開始縮減並且跟激發能量有線性位移趨勢，從時間解析光激螢光光譜發現金奈米團簇的衰減時間是跟激發能量與螢光能量有相當關係，藉此提出金奈米團簇位置選擇性螢光模型，也從光激螢光激發光譜觀察到位置選擇性的吸收峰，並發現位置選擇性跟覆蓋的分子有關係。此外我們發現金奈米團簇在低溫下光激螢光有不同放射機制存在。

關鍵字

金奈米團簇 ； 光激螢光

並列摘要

Photoluminescence (PL) from the Au nanoclusters (NCs) has been investigated. Upon scanning the excitation light with energy below 2.1 eV down to 1.6 eV, the PL narrows and begins shifting linearly with excitation energy. The time-resolved PL was studied and the PL decay traces of Au NCs were found to depend on the excitation and emission energies. We observed absorption peak of site-selective PL from photoluminescence excitation (PLE). The effect of site-selective PL was found to depend on the capping molecules of Au NCs. In addition, we studied the PL in Au NCs in low temperatures, and found it involves different emission mechanism.

並列關鍵字

gold nanoclusters ； PL

參考文獻

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