Ultra-lightweight pressure sensor based on graphene aerogel decorated with piezoelectric nanocrystalline films

In this paper, we report on a pressure sensor based on graphene aerogel functionalized with SnO₂ or GaN thin films deposited by magnetron sputtering. Decoration by nanocrystalline SnO₂ or GaN was found to enhance the piezoresistive response of the bare aerogel. The responsivity and pressure sensing range (from 1-5 atm) of the sensor are shown to be higher than those inherent in pressure sensors based on graphene membranes.