本研究係以硝酸鎘與亞硫酸硒鈉為前驅鹽，採用逆微胞法合成奈米級硒化鎘(CdSe)粉體。實驗中，以二辛基磺基丁二酸鈉(AOT)為界面活性劑，探討W0值、反應溫度、[Cd2+]/[Se2-]比例、前驅鹽比例、溶劑種類等製備變因對所得微粉晶態、粒徑及其分佈之影響。另外，對於所製備粉體之UV吸收及放光性質亦加以探討。
實驗結果顯示，以逆微胞法合成的硒化鎘粉體晶態為面心立方型;藉由DLS測量及TEM分析可知，硒化鎘粉體會穩定分散於逆微胞內，且提升W0值、反應溫度、[Cd2+]/[Se2-]比例及前驅鹽濃度至某適當值時，粉體粒徑呈現一最小值。以環己烷、異辛烷、正己烷、正庚烷、正十二烷為溶劑製備CdSe粉體，結果發現以正己烷為溶劑所製備之硒化鎘粉體粒徑最小。實驗結果並顯示，當CdSe粉體粒徑減小時，其吸光及放光波長均呈現藍位移之現象，此粉體之能隙亦變大。
在本實驗條件下，所得粉體之能隙約在2.1-3.0 eV之間，理論粒徑在5.4-3.3 nm間。為提供多元應用性，CdSe奈米粉體可藉由簡單地調變逆微胞系統之製備條件而獲得不同的吸放光能階。

In this study, nano-sized CdSe particles were synthesized by the reverse micelle method, starting from Cd(NO3)2 and Na2SeSO3. Dioctyl sulfosuccinate sodium salt (AOT) was added as the surfactant. The effects of preparation conditions, such as W0 value, reaction temperature, [Cd2+]/[Se2-] ratio, concentrations of precursors and solvents, on the characteristics of prepared CdSe particles including the crystalline structure, particle size and size distribution were investigated. Furthermore, the ultraviolet absorption and photoluminescent properties of the particles were also studied.

The experimental results showed that the resulting CdSe nanoparticles synthesized by the reverse micelle method were are all fcc-structured. From the results of DLS and TEM observations, it was found that the prepared CdSe nanoparticles were stablely dispersed in the reverse micelles. Moreover, the size of CdSe particles decreased to a minimum as increasing the W0 value, reaction temperature, [Cd2+]/[Se2-] ratio and concentrations of precursors to their optima. Various solvents, i.e., cyclohexane, isooctane, hexane, heptane and dodecane were used for the study of solvent effect. The result showed that the CdSe nanoparticles synthesized in hexane system demonstrated the minimum particle size. It also revealed that the UV/VIS absorption and photoluminescence spectra were toward blue shift with decreasing the size of CdSe particles. Therefore, the bandgap of particles became larger.

In this study, the prepared CdSe particles were sizing from 5.4 to 3.3 nm which were corresponded to band gaps from 2.1 to 3.0 eV. In order to meet versatile applications, the bandgap of the prepared CdSe nanoparticles could be simply modulated by the preparation conditions in the reverse micelle system.

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