Li Chi, Tang Xiao-liang, Qiu Gao
College of Science, Donghua University, Shanghai 201620, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2008 Dec;28(12):2754-7.
A new approach to surface modification of materials using dielectric barrier discharge (DBD) plasma jet at atmospheric pressure is presented in the present paper. The emission spectral lines of argon plasma jet at atmospheric pressure were recorded by the grating spectrograph HR2000 and computer software. The argon plasma emission spectra, ranging from 300nm to 1000 nm, were measured at different applied voltage. Compared to air plasma emission spectra under the same circumstance, it is shown that all of the spectral lines are attributed to neutral argon atoms. The spectral lines 763.51 and 772.42 nm were chosen to estimate the electron excitation temperature. The purpose of the study is to research the relationship between the applied voltage and temperature to control the process of materials' surface modification promptly. The results show that electron excitation temperature is in the range of 0.1-0.5 eV and increases with increasing applied voltage. In the process of surface modification under the plasma jet, the infrared radiation thermometer was used to measure the material surface temperature under the plasma jet. The results show that the material surface temperature is in the range of 50-100 degrees C and it also increases with increasing applied voltage. Because the material surface was under the plasma jet and its temperature was decided by the plasma, and the material surface temperature increased with increasing the macro-temperature of plasma jet, the relationship between the surface temperature and applied voltage indicates the relationship between the macro-temperature of the plasma jet and the applied voltage approximately. The experimental results indicate that DBD plasma jet at atmospheric pressure is a new approach to improving the quality of materials' surface modification, and spectral diagnosis has proved to be a kind of workable method by choosing suitable applied voltage.
本文提出了一种在大气压下利用介质阻挡放电（DBD）等离子体射流对材料进行表面改性的新方法。用光栅光谱仪HR2000和计算机软件记录了大气压下氩等离子体射流的发射光谱线。在不同的外加电压下测量了范围为300nm至1000nm的氩等离子体发射光谱。与相同条件下的空气等离子体发射光谱相比，结果表明所有光谱线均归因于中性氩原子。选择763.51和772.42nm的光谱线来估计电子激发温度。本研究的目的是研究外加电压与温度之间的关系，以便迅速控制材料表面改性过程。结果表明，电子激发温度在0.1 - 0.5eV范围内，并随外加电压的增加而升高。在等离子体射流作用下的表面改性过程中，使用红外辐射温度计测量等离子体射流作用下的材料表面温度。结果表明，材料表面温度在50 - 100℃范围内，并且也随外加电压的增加而升高。由于材料表面处于等离子体射流作用下，其温度由等离子体决定，且材料表面温度随等离子体射流宏观温度的升高而升高，因此表面温度与外加电压之间的关系大致表明了等离子体射流宏观温度与外加电压之间的关系。实验结果表明，大气压下的DBD等离子体射流是提高材料表面改性质量的一种新方法，并且光谱诊断已被证明是一种通过选择合适的外加电压来实现的可行方法。
