OES diagnostic of radicals in 33 MHz radio-frequency Ar/C<sub>2</sub>H<sub>5</sub>OH atmospheric pressure plasma jet

Qianghua YUAN (袁强华); Pei REN (任佩); Yongjie ZHOU (周永杰); Guiqin YIN (殷桂琴); Chenzhong DONG (董晨钟)

doi:10.1088/2058-6272/aaebd1

Plasma Science and Technology > 2019 > 21(2): 25402-025402. > DOI: 10.1088/2058-6272/aaebd1

Qianghua YUAN (袁强华), Pei REN (任佩), Yongjie ZHOU (周永杰), Guiqin YIN (殷桂琴), Chenzhong DONG (董晨钟). OES diagnostic of radicals in 33 MHz radio-frequency Ar/C₂H₅OH atmospheric pressure plasma jet[J]. Plasma Science and Technology, 2019, 21(2): 25402-025402. DOI: 10.1088/2058-6272/aaebd1

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OES diagnostic of radicals in 33 MHz radio-frequency Ar/C₂H₅OH atmospheric pressure plasma jet

Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People’s Republic of China

Funds: The authors gratefully acknowledge the support provided by National Natural Science Foundation of China (No. 11165012), Project of Natural Science Foundation of GanSu province (No. 145RJZA159), China Postdoctoral Science Foundation funded project (Nos. 2011M501494 and 2012T50831).

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Received Date: April 25, 2018

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Abstract

Abstract

Ar/C₂H₅OH plasma jet is generated at atmospheric pressure by 33 MHz radio-frequency power source. This RF excitation frequencies which are higher than 13.56 MHz had rarely been used in atmospheric pressure plasma. The plasma characteristics of ethanol are investigated. The introduction of ethanol leads to the generation of four excited carbonaceous species C, CN, CH and C₂ in plasma, respectively. Optical emission intensities of four carbonaceous species were strengthened with ethanol content increasing in the range of 0-4600 ppm. The ethanol content increase results in all the Ar spectra lines decrease. The reason is that the electron temperature decreases when ethanol content is high. The emission intensity ratios of C/C₂, CN/C₂ and CH/C₂ decrease with the increase of ethanol content, showing that the relative amount of C₂ is increasing by increasing the ethanol flow. The emission intensity ratios of excited species did not change much with the increase of RF power in stable discharge mode.
- atmospheric pressure plasma,
- optical emission spectroscopy,
- radical analysis

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OES diagnostic of radicals in 33 MHz radio-frequency Ar/C₂H₅OH atmospheric pressure plasma jet