以壳聚糖、柠檬酸、N-(2-羟乙基)乙二胺为原料, 通过水热法合成了壳聚糖基聚合点(P(CS-g-CA)Ds)荧光材料, 发现柠檬酸的接枝可明显提高壳聚糖聚合物点的量子产率。对P(CS-g-CA)Ds进行了红外光谱、紫外光谱、光电子能谱、透射电镜、热分解性能及光致发光光谱表征, 测试了不同pH值下的荧光强度。结果表明, P(CS-g-CA)Ds在pH=4～12范围内有良好的稳定性。通过测试紫外老化前后宣纸的羰基指数和乙烯基指数研究了P(CS-g-CA)Ds在宣纸中的应用, 结果表明其具有良好的抗紫外老化性能。

Fluorescent materials P(CS-g-CA)Ds were prepared by hydrothermal method using chitosan, citric acid, and N-(2-hydroxyethyl) ethylenediamine as raw materials. It was found that grafted citric acid could significantly increase the quantum yield of chitosan polymer carbon dots. The P(CS-g-CA)Ds were characterized by infrared spectroscopy, ultraviolet spectroscopy (UV), X-ray powder diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, thermal decomposition and photoluminescence spectra． The fluorescence performance tests at different pH values show that P(CS-g-CA)Ds have excellent stability in the pH range of 4-12. The application performance of P(CS-g-CA)Ds in rice paper was studied by testing the carbonyl index and the vinyl index of the paper before and after UV aging. The results demonstrate that P(CS-g-CA)Ds have good UV aging resistance performance.