基于氧等离子体辐照处理的缺陷工程策略调控石墨烯性能

Tuning properties of graphene by oxygen plasma treatment-induced defect engineering

从石墨烯的制备到实际应用的整个过程中,缺陷的存在或引入不可避免.因此,阐明缺陷如何影响石墨烯的性能至关重要.本研究通过实验研究和理论计算的方法研究了石墨烯的结构变化、缺陷演变及性能调控.结果表明,当处于sp3缺陷状态时,石墨烯能够较好的保持其原始的机械性能,而随着缺陷数量迅速增加,石墨烯的机械性能显著下降,整体结构最终被破坏.此外,氧等离子体辐照引入的空位缺陷的散射效应增加了电子散射的概率,但掺杂效应有利于石墨烯的电传输;同时,石墨烯面内导电性与氧等离子体处理引起的石墨烯表面起伏程度呈负相关.本工作为基于缺陷工程的石墨烯和其它二维材料的改性研究提供了指导方向.

Defects are inevitable throughout the entire graphene cycle,from fabrication to practical application.Therefore,illustrating how imperfections affect the properties of graphene is crucial.Herein,we study the structural changes,defect evolution,and property modulation via experimental research and theoretical calculation methods.The results show that graphene retains its pristine mechanical properties when in the sp3 defect regime,while the mechanical properties of graphene significantly decrease and the overall structure is eventually destroyed as the number of defects rapidly in-creases.In addition,the scattering effect of vacancy defects induced by oxygen plasma increases the probability of electron scattering,but the doping effect is conducive to the electrical transmission of graphene.The degree of undulation of the graphene surface influenced by oxygen plasma is negatively correlated with the internal conductivity of graphene.This work provides comprehensive guidance for modification of graphene and other two-dimensional materials via defect en-gineering.