# Misfit strain-induced energy dissipation for graphene/MoS2 heterostructure nanomechanical resonators

## TL;DR

This study uses molecular dynamics simulations to explore how misfit strain affects the energy dissipation and decoupling phenomena in graphene/MoS2 heterostructure nanomechanical resonators, revealing a strain-induced decoupling mechanism.

## Contribution

It uncovers the misfit strain-induced decoupling mechanism in graphene/MoS2 resonators and proposes a sandwich structure to mitigate this effect.

## Key findings

- Misfit strain causes decoupling during resonant oscillation.
- A relationship between misfit strain and decoupling is established.
- Graphene/MoS2/graphene sandwich structure prevents decoupling.

## Abstract

Misfit strain is inevitable in various heterostructures like the graphene/MoS 2 van der Waals heterostructure. Although the misfit strain effect on electronic and other physical properties have been well studied, it is still unclear how will the misfit strain affect the performance of the nanomechanical resonator based on the graphene/MoS 2 heterostructure. By performing molecular dynamics simulations, we disclose a misfit strain-induced decoupling phenomenon between the graphene layer and the MoS 2 layer during the resonant oscillation of the heterostructure. A direct relationship between the misfit strain and the decoupling mechanism is successfully established through the retraction force analysis. We further suggest to use the graphene/MoS 2 /graphene sandwich heterostructure for the nanomechanical resonator application, which is able to prevent the misfit strain-related decoupling phenomenon. These results provide valuable information for the future application of the graphene/MoS 2 heterostructure in the nanomechanical resonator field.