Abstract
In this work, bacterial cellulose (BC)/reduced graphene oxide (rGO) as a new class of electrical conductive nanocomposite aerogels were in-situ synthesized and dried by the supercritical CO2 (ScCO2) drying method. A modification has been performed on the self-consistent effective medium theory to predict overall electrical conductivity of nanocomposite aerogels. It was observed that the porosity had a distinct effect on the overall electrical conductivity of nanocomposite aerogel beneath percolation threshold, but had no effect beyond it. The latter observation was attributed to the formation of continuous pathway associated with electron tunneling effect, beyond percolation threshold. The results also indicated that in the presence of rGO, the density, specific surface area and Young's modulus of nanocomposite aerogel increased up to 0.025 g/cm3, 252 m2/g and 2020 MPa, respectively. Also, the gauge factor of 19 obtained for BC/rGO nanocomposite aerogel indicated the potency of fabricated nanocomposite aerogel as a strain sensor.
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