CdTe量子点的纯化以及作为pH探针的研究

Purification of Quantum Dots for Research on pH Probe

以巯基乙酸为稳定剂在水相中合成了CdTe量子点,并将合成的CdTe量子点进行表征、纯化。通过用0.05 mol.L-1PBS缓冲溶液调节不同的pH来考察量子点的荧光强度和pH的关系。研究发现,水溶性的CdTe量子点是pH敏感的,随着pH值的降低,量子点荧光强度的下降规律与溶液pH值呈现良好的线性关系。结果表明,CdTe量子点是一个令人满意的pH敏感的探针,有潜在的化学和生物传感能力。

Thioglycolic acid（TGA） capped water-soluble CdTe quantum dots（QDs） was synthesized via a hydrothermal synthesis method.The as-prepared QDs were characterized and purified.The relationship between fluorescence intensity of QDs and pH values was investigate by different concentration of PBS buffer.The results indicated that the water-soluble QDs was pH sensitive and the fluorescence of the QDs could be irreversibly quenched by H＋ and the fluorescence intensity of the water-soluble QDs decreased linearly with the pH decrease in the range of 6.45~8.22.It was found to be a satisfactory pH sensitive probe which could have potential chemical and biochemical sensing ability.