新型N,S共掺杂碳量子点的制备及其性能

Synthesis and characterization of N and S co-doped carbon dots

通过水热反应法,以苹果酸、乙二胺(N源体)和L-半胱氨酸(S源体)为碳源,制备了N和S共掺杂的荧光碳量子点,对该碳量子点的形貌、结构、组成和光学性能进行了试验,试验选择150℃作为反应体系温度,pH值调整为8.0,反应时间为24 h.研究结果表明:制备的新型N,S共掺杂碳量子点粒径分布均匀,水溶性好;通过X射线电子能谱,发现新型N,S共掺杂碳量子点主要由C,N,O和S构成,N和S分别以氨基和磺酸基团的形式存在于碳量子点的表面;新型N,S-CDots的荧光量子产率达到了23.84%,表明其具有较好的荧光性能.

A simple and novel synthesis method of carbon dots （CDots） was proposed via direct acid hydrolysis of malic acid, ethylenediamine and Lcysteine in onestep hydrothermal treatment. The morphology, structure, composition and optical properties of carbon quantum dots were tested. The optimized conditions for preparation of CDots were determined with reaction temperature of 150 ℃, pH value of 8.0 and reaction time of 24 h. The results show that the novel N,S codoped CDots have uniform particle size distribution and good water solubility. According to Xray diffraction patterns, the prepared N,SCDots mainly consist of C, N, O and S elements, and N and S elements exist in the form of amino group and sulfonic acid group, respectively. The fluorescence quantum yield of the prepared N,SCDots reaches 23.84% with good fluorescence properties for bioapplication.