脉冲液相放电引发等离子体合成碳量子点及其荧光特性

Pulsed Liquid Discharge-induced Plasma Synthesis of Carbon Quantum Dots and Their Fluorescence Properties

碳量子点具有优良的光学特性,在环境及能源领域中有重要的应用。为此采用脉冲液相放电技术在柠檬酸和尿素或三聚氰胺的混合水溶液中产生等离子体,引发原料化学反应合成碳量子点。通过放电电压和放电时间等参数的优化,获得了制备荧光碳量子点的最佳条件,并对碳量子点进行形貌、结构和荧光特性的表征。结果表明,脉冲放电峰值电压25 kV、电极间距5 mm、放电时间10 min为合成荧光碳量子点的最佳反应条件,并且液相放电法合成的碳量子点的发光特性可通过放电参数和物料配比等进行调节。该研究结果表明液相放电等离子体法是一种快速合成碳量子点的有效方法——一方面,为碳量子点的快速合成提供参考;另一方面,对液相脉冲等离子体技术的应用范围进一步拓宽。

Carbon quantum dots have excellent optical properties and have important applications in the field of environment and energy.In this paper,the pulsed liquid phase discharge technology was used to generate plasma in the mixed aqueous solution of citric acid,urea or melamine,which triggered chemical reactions to synthesize carbon quantum dots(CQDs).The optimal conditions for preparing CQDs were obtained through the optimization of parameters such as discharge voltage and discharge time,etc.,and the morphology,structure and fluorescent properties of the obtained CQDs were characterized.The results show that the optimal conditions for synthesizing CQDs are as follows:a pulsed discharge peak voltage of 25 kV,an electrode spacing of 5 mm,and a discharge time of 10 min,and the luminescent properties of CQDs can be adjusted by discharge parameters and material ratios.The result of this paper shows that the liquid discharge plasma method is an effective method for rapid synthesis of CQDs.On the one hand,it provides a reference for the rapid synthesis of CQDs;on the other hand,it further broadens the application scope of liquid-phase pulsed plasma technology.