Electromechanical Piezoresistive Sensing in Suspended Graphene Membranes

TL;DR

This paper demonstrates the piezoresistive effect in suspended monolayer graphene membranes, enabling highly sensitive, scalable pressure sensors with direct electrical readout, advancing nanoelectromechanical system applications.

Contribution

It provides the first conclusive experimental demonstration of graphene's piezoresistive effect in a membrane configuration with direct electrical readout.

Findings

Graphene membranes act as strain gauges independent of crystallographic orientation.

The sensors exhibit significantly higher sensitivity per unit area than conventional pressure sensors.

Experimental results align with simulations and previous gauge factor reports.

Abstract

Monolayer graphene exhibits exceptional electronic and mechanical properties, making it a very promising material for nanoelectromechanical (NEMS) devices. Here, we conclusively demonstrate the piezoresistive effect in graphene in a nano-electromechanical membrane configuration that provides direct electrical readout of pressure to strain transduction. This makes it highly relevant for an important class of nano-electromechanical system (NEMS) transducers. This demonstration is consistent with our simulations and previously reported gauge factors and simulation values. The membrane in our experiment acts as a strain gauge independent of crystallographic orientation and allows for aggressive size scalability. When compared with conventional pressure sensors, the sensors have orders of magnitude higher sensitivity per unit area.