大气压低温等离子体射流的物理化学特性研究

As a new gas discharge technology, which is able to generate low-temperature plasmas at atmospheric pressure, atmospheric pressure low-temperature plasma jets (AP-LTPJs) have recently attracted significant attention. Because of several unique technical advantages, such as generation in open space, low gas temperature (even close to room-temperature), pollution-free, and enhanced chemistry, AP-LTPJs have great application potentials in various fields, like bio-medicine, material science, etc. In this project, a typical argon AP-LTPJ source driven by radio-frequency power supply, will be studied with emphasis on its physical and chemical characteristics. Various advanced diagnostic techniques, such as absolute optical emission spectroscopy, absorption spectroscopy, laser-induced fluorescence spectroscopy, etc., will be applied combining modelling simulation to determine the absolute doses of several active agents of the argon plasma jet, such as UV intensity, densities of metastable argon atoms and reactive oxygen species (ROS), flux of charge particles, etc., and the space distribution of these agents in plasma jet. Meanwhile, project will focus on the investigations of the generation of these active agents at different working conditions, and to obtain their main generation mechanisms. Finally based on these work, efforts will be contributed to develop reliable techniques to control the doses of these active agents of the argon plasma jet, which will provide important experimental and theoretical basis for the fundamental research of various applications of AP-LTPJs.

大气压低温等离子体射流是近年来备受关注的一种新型大气压低温气体放电技术，由于其诸多独特的技术优势，例如产生于开放的环境中，气体温度低（甚至接近于室温），无污染、以及化学活性强等，在众多领域（生物医学、材料等）有着良好的应用前景。本项目以一种典型的射频氩气等离子体射流源作为研究对象，采用多种诊断技术和方法，例如绝对辐射光谱、吸收光谱、以及激光诱导荧光光谱等，并结合模拟计算，对氩气等离子体射流的物理化学特性进行深入的诊断研究。定量诊断氩气等离子体射流的紫外线强度、亚稳态氩原子、氧活性粒子等的密度、带电粒子的流量,以及这些活性因素的空间分布，研究不同放电条件下这些活性因素的变化规律，获取活性因素的产生机制，以及发展活性因素剂量的控制技术，为大气压低温等离子体射流的应用机理研究提供实验和理论基础。

大气压低温等离子体射流是近年来备受关注的一种新型大气压气体放电技术，由于其诸多独特的技术优势，例如产生于开放环境中，气体温度低（甚至接近于室温），无污染、以及化学活性强等，在众多领域（生物医学、材料等）有着良好的应用前景。本项目采用多种诊断技术和方法，包括辐射光谱、激光诱导荧光光谱等，对一种典型射频氩气等离子体射流的物理化学特性进行深入详细的诊断研究。定量确定了氩气等离子体射流的基本参数，包括气体温度、电子密度，以及射流中重要活性成分羟基与氧原子的密度分布；研究了不同放电条件下基本参数与活性成分的变化规律，以及羟基与氧原子的产生、消失机制，为大气压低温等离子体射流的应用机理研究提供实验和理论基础。