Synthesis of vertical graphene nanowalls by cracking n-dodecane using RF inductively-coupled plasma-enhanced chemical vapor deposition

Jiageng ZHENG (郑佳庚); Qinhuai TAN (谭钦怀); Hang CHEN (陈航); Angjian WU (吴昂键); Xiaodong LI (李晓东); Jianhua YAN (严建华); Jiaxu DAI (戴佳栩); Jiao ZHOU (周娇)

doi:10.1088/2058-6272/ab5194

Plasma Science and Technology > 2020 > 22(2): 25504-025504. > DOI: 10.1088/2058-6272/ab5194

Jiageng ZHENG (郑佳庚), Qinhuai TAN (谭钦怀), Hang CHEN (陈航), Angjian WU (吴昂键), Xiaodong LI (李晓东), Jianhua YAN (严建华), Jiaxu DAI (戴佳栩), Jiao ZHOU (周娇). Synthesis of vertical graphene nanowalls by cracking n-dodecane using RF inductively-coupled plasma-enhanced chemical vapor deposition[J]. Plasma Science and Technology, 2020, 22(2): 25504-025504. DOI: 10.1088/2058-6272/ab5194

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Synthesis of vertical graphene nanowalls by cracking n-dodecane using RF inductively-coupled plasma-enhanced chemical vapor deposition

¹ State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
² China United Engineering Corporation Limited, Hangzhou 310000, People's Republic of China

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Received Date: September 25, 2019
Revised Date: October 25, 2019
Accepted Date: October 27, 2019

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Abstract

Abstract

A facile and controllable one-step method to treat liquid hydrocarbons and synthesize vertical graphene nanowalls has been developed by using the technique of inductively-coupled plasmaenhanced chemical vapor deposition for plasma cracking of n-dodecane. Herein, the morphology and microstructure of solid carbon material and graphene nanowalls are characterized in terms of different operating conditions, i.e. input power, H₂/Ar ratio, injection rate and reaction temperature. The results reveal that the optimal operating conditions were 500 W, 5:10, 30 μl min⁻¹ and 800 °C for the input power, H₂/Ar ratio, injection rate and reaction temperature, respectively. In addition, the degree of graphitization and the gaseous product are analyzed by Raman spectroscopy and gas chromatography detection. It can be calculated from the Raman spectrum that the relative intensity of ID/IG is approximately 1.55, and I2D/IG is approximately 0.48, indicating that the graphene prepared from n-dodecane has a rich defect structure and a high degree of graphitization. By calculating the mass loading and detecting the outlet gas, we find that the cracking rate of n-dodecane is only 6%–7% and that the gaseous products below C₂ mainly include CH₄, C₂H₂, C₂H₄, C₂H₆ and H₂. Among them, the proportion of hydrogen in the outlet gas of n-dodecane cracking ranges from 1.3%–15.1% under different hydrogen flows. Based on our research, we propose a brand new perspective for both liquid hydrocarbon treatment and other value-added product syntheses.
- ICPECVD,
- n-dodecane cracking,
- vertical graphene nanowalls

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Synthesis of vertical graphene nanowalls by cracking n-dodecane using RF inductively-coupled plasma-enhanced chemical vapor deposition