Ultrasensitive Pressure Sensor Based on an Ultralight Sparkling Graphene Block

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