Abstract
This study aims on the dynamic and tribological characterization of a Single Layer Graphene Sheet (SLGS) including the effects of a graphene cantilever’s deflection. A 10 x 10 nm graphene model is developed, which is modally analyzed for both Zigzag and Armchair lattices. A typical Atomic Force Microscope (AFM) cantilever with carbon coated tip is also modeled during the simulation. The friction forces applied on the tip during its movement can be evaluated. The real contact area is characterized as the carbon atom tip is interlinked with the graphene atoms via the Lennard-Jones model. This study confirmed that the deformation of the AFM cantilever, is important to predict more accurately the tribological behaviour of graphene and the effect of its lattice orientation to its frictional properties. Therefore, this simulation provides an interesting way to understand the complex interaction between the cantilever tip and the sample in different contact conditions.
Highlights
Friction and wear are topics of great interest in many industrial and automotive applications such as high performance vehicles
For positive normal forces the friction force increased with respect to the normal force, for negative normal forces, as the friction force microscopy (FFM) tip pulled the graphene sheet friction increased as normal force decreased
A model is developed for virtual Atomic force microscopy (AFM) measurements for the calculation of the static friction coefficient as a first step
Summary
Friction and wear are topics of great interest in many industrial and automotive applications such as high performance vehicles. The interaction forces between the cantilever tip and the examined specimen are dependent nonlinearly on the separation between them For this reason, the modeling and analyzing of AFM dynamics are difficult. The basic idea οf this paper was the development of a simulation model in order to characterize monolayer graphene sheets, in terms of its dynamical and tribological behavior. A model is developed for virtual AFM measurements for the calculation of the static friction coefficient as a first step. The current study tries to simulate the AFMs basic operations, developing a virtual lab, and proceeds further on this issue by coupling the cantilever tip deflections on a Single Layer Graphene Sheet (SLGS). A very reliable and quick virtual laboratory for measuring the static friction coefficient in atomic scale is proposed here
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