Pickering emulsion for multifunctional cellulose/graphene oxide/paraffin wax-derived carbon aerogel film with photothermal and Joule heating performance for pressure sensors

The development of the Internet of Things has increased the anticipation for wearable smart devices in personalized healthcare. Carbon aerogel films, characterized by multifunctional and lightweight porous properties, are emerging as promising components for lightweight smart devices. In this study, we adopt a straightforward, cost-effective approach to fabricate carbon aerogels using cellulose nanofibers (CNF) and graphene (GO) co-stabilized Pickering emulsion, followed by vacuum filtration, freeze-drying, and carbonization treatment. The carbonization process involves the pyrolysis of paraffin wax and the reduction of graphene oxide, resulting in a uniquely porous structure, low density, and remarkable properties related to Joule heating, photothermal conversion, and conductivity sensitivity across a wide range of stresses. Incorporating CRP-30 into a piezoresistive sensor enables real-time monitoring of subtle human activities such as carotid pulse beats, swallowing, and facial expressions. This multifunctional carbon aerogel film holds great promise in the domains of wearable personal thermal management and personal health monitoring.