Deciphering the Nanoscale Frictional Properties of Two-Dimensional SnSe and SnSe2 with Lateral Force Microscopy
Abstract
In this study, we employed lateral force microscopy, a specialized technique within atomic force microscopy, to explore the nanoscale frictional properties of 2D SnSe and SnSe2 layers, and we compared these findings with graphene, a commonly used solid lubricant. Our results revealed that SnSe and SnSe2 layers exhibited superior lubricative performance compared to graphene with similar thickness, with SnSe2 demonstrating friction levels up to three times lower. This lower friction observed in SnSe2, as compared to SnSe, was further substantiated by extensive Density Functional Theory (DFT) calculations, confirming the intrinsic material properties contributing to their enhanced lubricative behavior.
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