Microwave Synthesis of CdTe/TGA Quantum Dots and Their Thermodynamic Interaction with Bovine Serum Albumin

The thioglycollic acid（TGA） as a capping agent, CdTe/TGA quantum dots（QDs） with excellent properties were synthesized under microwave irradiation. The TGA/Cd/Te molar ratios, reaction time, temperature and p H are the crucial factors for properties of QDs. The QDs were characterized by UVvis absorption and fluorescence spectra, transmission electron microscopy and Fourier transform infrared spectroscopy. The experimental results show that when the p H value is 11.5 and molar ratio of TGA：Cd：Te is 1.2：1：0.4 at 100 ℃ heating for 15 min, the resulted QDs exhibit a high fluorescence quantum yield of 78%. The fluorescence full width at half maximum（FHMW） of QDs is around 23 nm. The products are spherical with average size of 3-5 nm. There is a strong coordination effect between TGA and Cd2＋. Moreover, the results of interaction between as-made QDs and bovine serum albumin（BSA） suggest that the QDs-BSA binding reaction is a static quenching. The negative values of free energy（△G〈0） suggest that the binding process is spontaneous, △H〈0 and △S〈0 show that hydrogen bonds and van der Waals interactions play a major role in the binding reaction between QDs and BSA.

水溶性CdTe纳米棒的制备及在细胞成像中的应用

以亚碲酸钠(Na_2TeO_3)为碲源,半胱氨酸(L-Cys)和巯基乙酸(TGA)为双修饰剂在水相中快速合成高质量CdTe纳米棒。通过紫外可见分光光谱仪、荧光光谱仪、扫描电子显微等相关方法对产物进行表征。实验结果表明,所制备的CdTe纳米棒具有强的紫外吸收和高荧光特性及均匀的微米级棒状形貌。更重要的是通过细胞成像发现,尺寸较大的CdTe纳米棒主要进入细胞质中,不能进入细胞核。本文的研究显示:L-Cys/TGA双修饰CdTe纳米棒具有良好的荧光特性和生物相容性,在生物传感和细胞成像领域具有重要的应用价值。