Internal friction characteristic and analysis of in-plane natural frequency of trilayer complexes formed from graphenes and boron nitride nanosheets
Abstract
The internal friction and in-plane natural frequency of a trilayer complex formed by a monolayer graphene sandwiched in the bilayer of boron nitride nanosheets (BN/G/BN) and graphenes (G/G/G) are studied by using molecular dynamics. The investigation shows that the internal friction coefficients for BN/G/BN (∼0.025) are significantly higher than that of G/G/G (∼0.015). The coefficients for both G/G/G and BN/G/BN increased with external pressure. The speed of increase is divided into quick increase, slow increase and saturation stage. The internal friction coefficients for G/G/G and BN/G/BN follow the simple microscopic theory of Amontons laws only when the external pressure exceeds 170 nN. These findings are expected to help enhance the understanding of the mechanism of nano-tribology and provide an effective micro-control method of internal friction. Subsequent analysis shows that the in-plane natural frequency of mid-layer graphene in BN/G/BN is significantly higher than in G/G/G and both increase as the external pressure increases. Moreover, the natural frequency of mid-layer graphene in trilayer complexes, especially in BN/G/BN, is extremely sensitive to external pressure loads.
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