Numerical simulation of carbon arc discharge for graphene synthesis without catalyst

• 作 者: Kai YE Da ZHANG Kaiwen ZHANG Haoyu WANG Feng LIANG Wenhui MA Bin YANG Yongnian DAI
• 机 构: Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming
• 出 处: 等离子体科学和技术（英文版）
• 发表日期: 2021年7期
• 关键词: graphene arc discharge numerical simulation growth mechanism saturation temperat

In this study,graphene sheets are prepared under a hydrogen atmosphere without a catalyst,and the growth mechanism of graphene by direct current arc discharge is investigated experimentally and numerically.The size and layer numbers of graphene sheets increase with the arc current.Distributions of temperature,velocity,and mass fraction of carbon are obtained through numerical simulations.A high current corresponds to a high saturation temperature,evaporation rate,and mass density of carbon clusters.When the carbon vapor is saturated,the saturation temperatures are 3274.9,3313.9,and 3363.6 K,and the mass densities are 6.4×1022,8.42×1022,and 1.23×1023 m-3 under currents of 150,200,and 250 A,respectively.A hydrogen-induced marginal growth model is used to explain the growth mechanism.Under a high current,the condensation coefficient and van der Waals force increase owing to the higher saturation temperature and mass density of carbon clusters,which is consistent with experimental results.