▎ 摘　　要

It is shown by the molecular dynamics method using the two-dimensional chain model that the motion of graphene nanoparticles (nanoribbons and nanotubes) on a flat thermalized multilayer h-BN substrate is described as the motion of particles in a viscous medium with a constant friction coefficient. The effective friction that occurs during movement has a wave nature, the reason of braking is the interaction of the nanoparticle with thermal bending vibrations of the substrate sheets. The friction coefficient increases monotonically with temperature and decreases upon an increase in the nanoparticle size. The friction emerging for nanoribbons can be divided into two types: internal friction and edge friction (the friction of the inner surface of a nanoribbon and the friction of its edges with the substrate surface). Edge friction plays the major role for lengths L < 35 nm, while internal friction is more important for L > 35 nm. Under the action of a constant longitudinal force, the nanoparticle dynamics is always characterized by the regime of motion at a constant velocity, the value of which is directly proportional to the force and inversely proportional to the friction coefficient. The simulation of the motion of a nanoribbon in the presence of a normal load (pressure) shows that an increase in the load reduces the internal friction due to a decrease in the amplitude of thermal bending vibrations of the substrate layers under the nanoribbon and enhances the edge friction due to pressing of nanoribbon edges into the substrate. For this reason, the effect of reduction of friction upon an increase of the normal load can be observed only for quite long nanoribbons (L > 250 nm), when the internal friction plays the major role.