Improvement on Piezoresistive Sensing Behavior of Graphene Sponge by Polyaniline Nanoarrays
Following the fast development of microelectronic systems, the multifunctional microelectronic components featuring with high sensitivity, large stretchability, and wide sensing range have attracted a huge surge of interest. Here, pressure sensors based on the novel three-dimensional (3D) network structure are introduced, which are consisted of the 3D ordered reduced graphene oxide (rGO) sponge microstructure and polyaniline (PANI) nanoarrays via the interfacial polymerization and hydrothermal self-assembly processes. The nano-scaled PANI arrays greatly enhance the strength and electrical conductivity of the 3D microarchitectural rGO sponge, endowing the pressure sensor with a high sensitivity of 0.77 kPa-1 within 6 kPa, a wide reliable sensing range up to 10.22 kPa, a rapid response time of 50 ms, and an excellent stability of 3000 cycles. Accordingly, a flexible pressure sensor is fabricated based on the as-prepared sponge, which can be used as wearable device for real-time and high-accuracy detection of the subtly physiological and external stimulis, as well as large motions from facial expression of eye, knee, and finger. The outstanding piezoresistive sensing performance of this pressure sensor makes it a promising candidate for developing advanced microelectronic system.