Ultrasensitive\nPressure Sensor Based\non an Ultralight Sparkling Graphene Block

Abstract

Herein, we develop\na supersensitive pressure sensor based on a fully air-bubbled ultralight\ngraphene block through a simple sparkling strategy. The obtained sparkling\ngraphene block (SGB) exhibits excellent elasticity even at 95% compressive\nstrain and rebounds a steel ball with an ultrafast recovery speed\n(∼1085 mm s^–1). Particularly, the SGB-based\nsensor reveals a record pressure sensitivity of 229.8 kPa^–1, much higher than other graphene materials, because of the highly\ncavity-branched internal structure. Impressively, the pressure sensor\ncan detect the extremely gentle pressures even beyond the real human\nskin and hence are promising for ultrasensitive sensing applications.