Biomimetic Ultraflexible Piezoresistive Flow Sensor Based on Graphene Nanosheets and PVA Hydrogel

Abstract Flow sensors play a critical role in monitoring flow parameters, including rate, velocity, direction, and rotation frequency. In this paper, inspired by biological hair cells the human vestibular system, an innovative sensor is developed based on polyvinyl alcohol (PVA) hydrogel nanocomposites with maze‐like network of vertically grown graphene nanosheets (VGNs). The VGNs/PVA absorbs copious amount water when immersed water, making highly sensitive to tiny stimuli underwater. demonstrates high sensitivity (5.755 mV (mm s −1 ) extremely low velocity detection (0.022 mm ). It also reveals outstanding performance detecting low‐frequency oscillatory flows down 0.1 Hz, which make it suitable for many biomedical applications. As one potential applications sensor, exhibits excellent mimicking various physiological conditions cells. To explain experimental results, complete finite element simulation model piezoresistive effect thin film structure. This first attempt develop hydrogel–graphene nanosheet‐based sensors, creates closest artificial miniaturized cell paves way utilizing hydrogels next‐generation ultrasensitive