# Investigation of Current Effect of Suspended Graphene Pressure Sensor

## TL;DR

This study examines how current affects a suspended graphene pressure sensor, finding stable performance up to certain thresholds and explaining resistance changes due to oxygen adsorption and desorption.

## Contribution

The study reveals the current-induced resistance behavior in suspended graphene sensors and explains the underlying oxygen adsorption/desorption mechanism.

## Key findings

- Graphene resistance and piezoresistive effect remain stable up to 400 μA and 300 μA, respectively.
- Resistance increases initially due to oxygen adsorption and decreases later due to Joule-induced desorption.
- The findings provide guidance for electrical testing of suspended graphene devices.

## Abstract

The current effect of passive devices is crucial for device testing. The current effect of a suspended graphene pressure sensor in the range of 0–2 mA is studied in this paper. The results show that the resistance of graphene films and the piezoresistive effect of devices exhibit stable performance within the current threshold range of 400 μA and 300 μA, respectively. Auger electron spectroscopy and Raman spectroscopy tests indicate that the resistance of graphene increases first and then decreases at high current intensity, resulting from the electrostatic adsorption of oxygen atoms in the initial phase of electrification and the Joule-induced desorption in the later phase. This study presents guiding significance for the electrical testing of suspended graphene devices.