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| 研究生： |
王慧中 Hui-Chung Wang |
|---|---|
| 論文名稱： |
有機電光材料修飾之硒化鎘奈米粒子的合成及性質研究 Synthesis and Property of CdSe Nanoparticles Coated with Organic Electroluminescent Materials |
| 指導教授： |
王添福
Tein-Fu Wang 吳春桂 Chun-Guey Wu |
| 口試委員: | |
| 學位類別： |
碩士 Master |
| 系所名稱： |
理學院 - 化學學系 Department of Chemistry |
| 畢業學年度： | 92 |
| 語文別： | 中文 |
| 論文頁數： | 78 |
| 中文關鍵詞： | 奈米粒子 、硒化鎘 、核層結構 |
| 外文關鍵詞： | nanocrystals, CdSe |
| 相關次數： | 點閱：9 下載：0 |
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本篇論文主要研究CdSe與CdSe/ZnS的合成及光學性質，並討論奈米粒子與吸附於其表面的有機發光團間的能量轉移。我們以膠體合成法合成CdSe奈米粒子，利用反應時間控制粒子的大小，得到粒徑為2.4 nm – 3.8 nm，吸收光譜範圍為498nm – 589 nm，放光光譜為506 nm – 603 nm之粒子。使用Zn(C2H5)2/(TMS)2S合成高穩定性與高量子產率(63.5%)，核層結構的CdSe/ZnS。
使用不同性質的有機基團修飾粒子表面，使其可溶於不同的溶劑中，做更廣泛的應用。使用硫基乙酸修飾奈米粒子，可使粒子溶於水相中。另外選擇具光電性質的有機發光團，如：苯炔共軛分子和三茀化合物。當光激發在 ligand上時，得到奈米粒子的放光有消光情形，這是因為CdSe的LUMO比ligand低，電子容易轉移到奈米粒子上，形成電荷分離的情形；當光激發在奈米粒子的吸收上時，粒子放光強度沒有變化，這可能是因為奈米粒子的LUMO較ligand高，所以ligand上的電子不易轉移到奈米粒子上。
Cadmium selenide nanoparticles passivated with organic conjugated oligomer and/or terfluorenes were prepared and their optoelectronic properties investigated. The CdSe nanoparticles were synthesized by use of the less toxic CdO. The diameter of the nanoparticles could be controlled by the reaction temperature and the reaction time. Particles ranged from 2.4 nm to 3.8 nm with narrow size distribution were obtained, as evidenced by TEM. The core, CdSe was protected by ZnS shell to increase the stability as well as the quantum yield. Sight red shifts of the absorption and fluorenscence of the core/shell structure than that of the core only structure were observed.
When passivated with a water soluble mercaptoacetic acid, the resultant organic passivated nanoparticles became soluble in water. Conjugated oligomer passivated nanoparticles show unusual optoelectronic property. Excitation of the organic material resulted in change separation as supported by the fluorescence qnenching of the emission of the nanoparticles. When the excition was selected only on the nanoparticles, the emission intensity from the nanoparticles stay comparable to that of the unpassivated nanoparticles. The energy diagram that showed the LUMO of nanoparticle is lower than that chromophor was therefore proposed.
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