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Pressure-dependent synthesis of graphene nanoflakes using Ar/H2/CH4 non-thermal plasma based on rotating arc discharge
Diamond and Related Materials ( IF 4.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.diamond.2020.108176
Cheng Wang , ZhongShan Lu , Jing Ma , Xianhui Chen , Chengpeng Yang , Weidong Xia

Abstract Non-thermal plasma can be used for the continuous synthesis of graphene nanoflakes. In this paper, the influence of pressure on graphene nanoflake synthesis was studied in an Ar/H2/CH4 non-thermal plasma based on rotating arc discharge. Graphene nanoflakes were fabricated by CH4 decomposition in a pressure range of 20–200 kPa, and their properties were analyzed multiple characterization methods. The results showed that pressure affected the product properties and yield. From 60 to 200 kPa, all products were graphene nanoflakes with sizes of 50–300 nm and 1–20 graphite layers. A relatively high pressure favored the formation of graphene nanoflakes in high yield, with good crystalline structures, low oxygen contents, and excellent thermal stability. A low pressure promoted the formation of graphene nanoflakes with fewer layers and larger specific surface areas. Also, at a lower pressure (20 kPa), small spherical particles (3–8 nm diameter), similar to carbon dots, emerged on the graphene nanoflakes. Correlations between process parameters and characterization results suggested that different concentrations of carbonaceous radicals in the plasma zone affected the product characteristics.

中文翻译:

基于旋转电弧放电的 Ar/H2/CH4 非热等离子体压力依赖性合成石墨烯纳米薄片

摘要 非热等离子体可用于石墨烯纳米薄片的连续合成。本文在基于旋转电弧放电的 Ar/H2/CH4 非热等离子体中研究了压力对石墨烯纳米片合成的影响。石墨烯纳米薄片通过 CH4 在 20-200 kPa 压力范围内分解制备,并通过多种表征方法分析其性质。结果表明,压力影响产品性能和产量。从 60 到 200 kPa,所有产品都是石墨烯纳米薄片,尺寸为 50-300 nm,石墨层为 1-20。相对较高的压力有利于高产率地形成石墨烯纳米薄片,具有良好的晶体结构、低氧含量和优异的热稳定性。低压促进了石墨烯纳米薄片的形成,层数更少,比表面积更大。此外,在较低压力 (20 kPa) 下,石墨烯纳米薄片上出现类似于碳点的小球形颗粒(直径 3-8 nm)。工艺参数与表征结果之间的相关性表明,等离子体区中不同浓度的碳质自由基会影响产品特性。
更新日期:2021-01-01
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