碳量子点的一步合成及其发光性质的研究

摘要

本文采用油浴加热柠檬酸一步法合成碳量子点，用HRTEM透射电镜和FTIR红外光谱对其形貌和结构进行表征。研究该碳量子点的荧光性质，初步探讨了其发光的可能机理。实验结果表明，该方法合成的碳量子点粒径大小为3～5 nm，在360 nm处有一个很强的紫外吸收峰，最大激发波长和发射波长分别为365 nm和460 nm，其光学稳定性良好，在pH5.0~7.0范围内，碳量子点的荧光强度随pH的变化比较敏感。%Carbon quantum dots (carbon QDs) was synthesized via oil bath heating using citric acid as materials, and the morphology and structure of carbon QDs were characterized by HRTEM and FITR. The fluorescence properties were stud-ied and the possible fluorescence mechanism of carbon QDs was discussed. The results indicated that carbon QDs were uni-form in size (3~5 nm) and the maximum excitation and emission wavelengths were 365 nm and 460 nm, respectively with a strong UV absorption peak at 360 nm. The fluorescence of carbon QDs was stable and showed pH dependently in pH 5.0~7.0.