▎ 摘　　要

NOVELTY - The method involves determining needle tip lateral torsion of a hetero-material layer. Friction between a graphene layer and a heterogeneous material layer is determined to obtain first set of voltage signals. Payload size is changed. A reciprocating friction needle tip is placed on a surface of the heterogeneous material layer to obtain second set of voltage signals. Again payload size is changed to obtain interlayer friction. The interlayer friction is compared with load change to obtain coefficient of friction between the graphene layer and the heterogeneous material layer. USE - Method for obtaining friction coefficient between heterogeneous materials by using a graphene film ball probe. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view illustrating a process for obtaining set of voltage signals by placing reciprocating friction needle on a surface of a heterogeneous material layer.