期刊
COATINGS
卷 12, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/coatings12111607
关键词
plasma-solution junction; solution plasma; Langmuir probe; spatial temperature
资金
- Open Innovation Platform with Enterprises, Research Institute and Academia (OPERA) of the Japan Science and Technology Agency (JST) [JPMJOP1843]
- Strategic International Collaborative Research Program (SICORP) of the Japan Science and Technology Agency (JST) [JPMJSC18H1]
This study experimentally determined the physical parameters of the plasma phase, plasma-gas phase, and gas-liquid phase in the solution plasma process (SPP), and proposed an energy band diagram for the plasma-solution junction. It was found that the Fermi level of organic molecules can affect the electron temperature in plasma, thus influencing the formation of carbon products.
The solution plasma process (SPP) can provide a low-temperature reaction field, leading to an effective synthesis of N-doped graphene with a high N content and well-structured planar structure. However, the interactions at the plasma-solution interface have not been well understood; therefore, it needs to be urgently explored to achieve the modulation of the SPP. Here, to address the knowledge gap, we experimentally determined the physical parameters of the spital distribution in the plasma phase, plasma-gas phase, and gas-liquid phase of the SPP by the Langmuir probe system with modification. Based on the assumption that plasma can act similarly to semiconductors with the Fermi level above the vacuum level, an energy band diagram of the plasma-solution junction could be proposed for the first time. It was observed that the Fermi level of the organic molecule could determine the magnitude of electron temperature in plasma, i.e., benzene produced the highest electron temperature, followed by phenol, toluene, and aniline. Finally, we found that the electron temperature at the interface could induce quenching, leading to the formation of multilayer large-size-domain carbon products. It provided significant evidence for achieving nonequilibrium plasma modulation of carbon nanomaterial synthesis.
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