Hydroxyl groups play an important role in friction of graphene oxides. In this paper,\nthe influence of hydroxyl groups on friction of graphene is investigated by molecular dynamics\nsimulation. The results show that the friction does not always go up with the rising of hydroxyl\ngroups ratio, and reaches the maximum when the hydroxyl groups ratio between interfaces is about\n10%. The reason is that hydrogen bonds tend to form in interlayers when the hydroxyl groups\nratio is high. The formed hydrogen bonds between interfaces are closely related to the friction.\nHowever, the analysis of the component of van derWaals, Coulomb�s forces and hydrogen bonds\ninteraction between interfaces indicates that van der Waals forces are dominant in friction, which can\nbe attributed to the influence of interface distance on friction.
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