高螢光效能量子點合成技術之研究

Study on the Synthesis of Quantum Dots with High Fluorescence Efficiency

陳智偉(Chih-Wei Chen)

指導教授 ： 張恒雄

中原大學/工學院/醫學工程研究所/碩士(2006年)

https://doi.org/10.6840/CYCU.2006.00502

摘要

本研究合成可見光波長的CdSe/ZnS 量子點，其螢光波長範圍介於510nm~625nm 之間，於量子點合成的同時掺入正十六碳胺(Hexadecylamine)，藉以改善CdSe/ZnS 量子點的螢光特性。經由螢光生命期與單一量子點螢光強度的量測，證實量子點表面的載子複合機率增加，因而提升了量子點本身的螢光強度，其量子產率最高可達
57.68%。另本研究中也利用不同的合成方式，合成出極小尺寸的CdSe/ZnS 藍色螢光量子點與螢光特性良好的近紅外光量子點CdTe，加上氫硫基化合物Mercaptopropionic acid 或兩性高分子Poly(maleic
anhydride alt-1-tetradecene)的方法將CdSe/ZnS量子點由疏水性改質成為親水性粒子。在CdSe/ZnS 藍色螢光量子點水相改質後，發現利用 ”annealing” 的作用，可以使量子點在水溶液中仍然保有其螢光強度，甚至有顯著提升的現象。藉由合成出這些高螢光強度、粒徑分佈集中、多重螢光顏色量子點，提供後續更多元化的實驗設計，並且有效地改善實驗結果的準確性。

關鍵字

量子點合成 ； 藍色螢光量子點 ； 螢光強度 ； 正十六碳胺

並列摘要

In this research, the visible CdSe/ZnS quantum dots were synthesized, and the fluorescent wavelength of these quantum dots were between 510nm~625nm. Hexadecylamine was mixed to the solvent during the process and it surely could enhance the fluorescence intensity of quantum dots. The phenomenon appeared that the rate of barrier recombination in surface state had increased. The increment of fluorescence intensity could be observed by measuring fluorescent spectrum, lifetime and single quantum dot. The quantum yield was up to 57.68%. Besides, the extremely small blue emission quantum dots and well-qualitative near-infrared CdTe quantum dots were synthesized by different methods. Mercaptopropionic acid or amphiphilic Poly(maleic anhydride alt-1-tetradecene) were used to transfer quantum dots into hydrophilic phase. While transferring blue emission quantum dots into TBE buffer, it was found the fluorescence intensity also increased after
the process of “annealing”. By utilizing these high fluorescence intensity, well size distribution, multiple colored quantum dots, there could be more various and precise researches in biomedical applications.

並列關鍵字

Hexadecylamine ； Blue emitted quantum dots ； Fluorescence intensity ； Quantum dots synthesis

參考文獻

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