本研究係在水溶液相中以硝酸鎘、硒氫化鈉與碲氫化鈉反應合成硒碲化鎘（CdSeTe）三元化合物奈米微粉，以獲得具有寬能隙及高放光強度之新型材料。實驗中除探討CdTe微粉之合成外，亦合成三種不同結構型式之CdSeTe微粉：Type I-CdSe(core)/CdTe(shell)，Type II-CdTe(core)/CdSe(shell)，Tpye III-CdSe-CdTe，並探討其微粉晶態、粒徑及分佈、形狀與吸放光性質。
　　實驗結果顯示，在控制pH=10.5下，添加2.5倍鎘離子濃度之硫醇丙酸(MPA)為錯合劑可避免氫氧化鎘之雜相存在，且可得到具放光性質之面心立方型碲化鎘奈米微粉。當降低前驅鹽濃度、提高pH值及調整適當硫醇丙酸濃度時均可使微粉粒徑降低。而在低pH值(pH<5.6)時，所得之碲化鎘微粉溶液亦不具有放光特性。
　　在合成CdSeTe微粉時，控制Cd:Se:Te比值為2:1:1，添加硫醇丙酸(2.5倍鎘離子濃度)為錯合劑，在35oC、pH10.5下合成CdSeTe微粉，結果顯示三種型式之微粉粒徑均小於10nm。經UV吸收及PL放光測試，微粉之UV吸收能隙TypeI、II、III分別為2.40~2.61、2.38~2.64、2.53~2.68eV，而放光則以TypeIII微粉之放光強度最佳。
　　由本研究結果可知，本法可在溫和之水相條件下，合成CdSeTe三元化合物微粉。尤值一提的是, 藉由改變pH值、前驅鹽濃度、MPA添加量及Cd/Se/Te比值，可調變所得微粉之粒徑大小、能隙結構及吸放光性質。

　　In order to obtain new materials with wide bandgap and high photoluminescence, CdSeTe nanoparticles have been synthesized by chemical wetness technique starting from the reaction of Cd(NO3)2 with NaHSe/NaHTe in aqueous solution. At first, the preparation of CdTe nanoparticles was investigated. Furthermore, three types of CdSeTe nanoparticles were obtained by different routes: Type I- CdTe(shell)/CdSe(core), Type II-CdSe(shell)/CdTe(core), and Type III-CdSe-CdTe. The characteristics of prepared particles including crystalline structure, particle size and size distribution, UV/Vis absorption and photoluminescence properties were also studied.

　　The experimental results show that by controlling the pH value (pH=10.5) and adding 3-mercaptopropionic acid (MPA) which 2.5 times of concentration of cadmium ion, the fcc-structured CdTe nanoparticles of photoluminescnece can be obtained without the presence of Cd(OH)2 impurities. Furthermore, it is found that the particle size decreases with reducing the pH value, the concentrations of precursors, and the amounts of MPA. However, at lower pH, e.g. pH<5.6, no photoluminescent property can be found for the resulting CdTe particles. Under the synthesis conditions of Cd:Se:Te = 2:1:1, 35oC, and pH10.5, the obtained particles for three types of CdSeTe, their particle sizes are all below 10nm. The absorption bandgap for Type I, II, and III particles are 2.40-2.61, 2.38-2.64, 2.53-2.68 eV respectively. Among three types of samples, Type III particles demonstrate the highest photoluminescence.

　　From this study, it is found that the CdSeTe nanoparticles can be synthesized in mild aqueous conditions. It is worth to note, the particle size, bandgap structure, and UV/PL properties of resulting nanoparticles can be modulated by adequately controlling the experimental conditions, such as pH value, precursor concentration, MPA concentration, and Cd/Se/Te ratio.

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