发光学报, 2019, 40 (12): 1546, 网络出版: 2020-01-09
壳聚糖衍生物基聚合物碳点对Pd2+的传感性能
Sensing Properties of Chitosan Derivatives-based Polymer Carbon Dots to Pd2+
摘要
以柠檬酸与壳聚糖为主要原料, 以1-乙基-(3-二甲基氨基丙基)碳酰二亚胺盐酸盐(EDC)和N-羟基琥珀酰亚胺(NHS)为偶合剂, 合成了一种壳聚糖衍生物(CS-g-CA)。然后将CS-g-CA与掺杂试剂N-(2-羟乙基)-乙二胺通过水热法合成了壳聚糖衍生物聚合物碳点(P(CS-g-CA)Ds)。采用荧光光谱、紫外光谱、透射电镜对P(CS-g-CA)Ds进行了表征和性能测试。结果表明该聚合物碳点具有良好的荧光性能, 有较高的量子产率(54.7%)和较长的荧光寿命(13.12 ns)。将P(CS-g-CA)Ds应用于金属离子检测中, 发现P(CS-g-CA)Ds对Pd2+有良好的选择性, 其检测极限为63.3 nmol/L。通过紫外吸收光谱、荧光寿命以及不同温度下猝灭常数的测定研究了Pd2+对P(CS-g-CA)Ds的荧光猝灭机制, 结果均表明其猝灭机制为静态猝灭。
Abstract
In this paper, a chitosan derivative(CS-g-CA) was synthesized by using citric acid and chitosan as main raw materials, N-hydroxysuccinimide(NHS) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride(EDC) as coupling agents. Then, the chitosan derivative polymer dot fluorescent material P(CS-g-CA) Ds was synthesized by hydrothermal method using CS-g-CA and the doping reagent N-(2-hydroxyethyl)-ethylenediamine. The P(CS-g-CA)Ds was characterized by fluorescence, ultraviolet spectroscopy(UV), transmission electron microscopy, photoluminescence spectra.The quantum yield and fluorescence lifetime of the test P(CS-g-CA)Ds were 54.7% and 13.12 ns, respectively, indicating that the polymer carbon dots have good fluorescence properties. When P(CS-g-CA)Ds was applied to metal ion detection, it was found that P(CS-g-CA)Ds had good selectivity to Pd2+ with a detection limit of 63.3 nmol/L. The fluorescence quenching mechanism of Pd2+ on P(CS-g-CA)Ds was studied by UV spectroscopy, fluorescence lifetime and quenching constant at different temperatures. The results show that the quenching mechanism is static quenching.
于淑娟, 袁广志, 汪丰, 鲁诗言, 李媛媛. 壳聚糖衍生物基聚合物碳点对Pd2+的传感性能[J]. 发光学报, 2019, 40(12): 1546. YU Shu-juan, YUAN Guang-zhi, WANG Feng, LU Shi-yan, LI Yuan-yuan. Sensing Properties of Chitosan Derivatives-based Polymer Carbon Dots to Pd2+[J]. Chinese Journal of Luminescence, 2019, 40(12): 1546.