The carbon quantum dots with bule fluorescence were prepared by hydrothermal method and followed by filtration, centrifugation, steaming and dialysis purification methods using sodium cyanate as carbon source and melamine as nitrogen dopant. Their properties were characterized. TEM showed that the size of the prepared nanoparticles was about 5 nm. UV-Vis spectroscopy showed that there were two absorption peaks for carbon quantum dots. Fluorescence spectroscopy showed that carbon quantum dots had an excitation-independent emission at 436 nm with good stability in concentrated salt solutions and alkaline solution. In addition, the response of carbon quantum dots to the different pH of acidic solutions was investigated. The results showed that the carbon quantum dots had potential application value for the preparation of acid sensors.%以柠檬酸钠为碳源,三聚氰胺为氮掺杂剂,在水热条件下得到无色溶液,经过过滤、离心、旋蒸、透析等系列纯化后即得发蓝色荧光的碳量子点,并对其性能进行了表征.透射电镜表明制备的碳量子点尺寸在5 nm左右,紫外光谱表明碳量子点有两个吸收峰,荧光光谱表明所制备的碳量子点在436 nm处具有独立于激发波长的发射峰,且具有较好的抗盐性和抗碱性.此外考察了碳量子点对不同pH值酸性溶液的敏感性,结果表明该碳量子点对于制备酸性pH传感器具有较好的应用潜力.
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