An experimental study of the graphene conductivity in an aqueous environment is carried out in this study. The presence of a time dependence of the graphene resistivity in water is established. In addition, the characteristic relaxation times of resistivity are determined when graphene is immersed in water and then dried. The resistivity temperature dependence is used to estimate the values of the band gap arising in graphene due to water contact. Based on the analysis of molecular dynamics modeling data, a possible mechanism responsible for the opening of the band gap in graphene is proposed. This mechanism is associated with the inhomogeneous tangential electric field appearance in the plane of the graphene flake, caused by water molecules structured near the graphene surface.

本研究对水性环境中的石墨烯电导率进行了实验研究。确定了水中石墨烯电阻率存在时间依赖性。此外，当石墨烯浸入水中然后干燥时，确定了电阻率的特征弛豫时间。电阻率温度依赖性用于估计石墨烯中由于水接触而产生的带隙值。基于对分子动力学建模数据的分析，提出了导致石墨烯带隙打开的可能机制。这种机制与石墨烯薄片平面中出现的不均匀切向电场有关，这是由石墨烯表面附近结构化的水分子引起的。