▎ 摘 要
We propose schematics for an ultra-sensitive pressure sensor based on graphene and investigate its mechanical responses using classical molecular dynamics simulations. The top structure is similar to a thumbtack or pushpin and the bottom structure is composed of the graphene on the cylindrical hole. So while the top plate applied to the actual pressure has a large area, the majority of the load transfers to the graphene through the narrow pin. Therefore, the sensitivity can be greatly enhanced and the sensing limits can be adjusted by designing the aspect ratio between the head and the pin areas composed of the top structure. Simulation results for the operations of the proposed sensor were in good agreement with the previous experimental and theoretical works. This proposed schematics can detect the pressure via the deflection change or/and the resonance frequency shift, and also have great potential for versatile applications in nanoelectromechanical systems.