Graphene-Based Flexible High-Resolution Pressure Sensors

Abstract

With the continuous development of electronic technology, sensors are moving toward miniaturization and high precision. This article focuses on the flexible, high-resolution and miniaturized features of the sensor to design a pressure sensor. This article uses 3D printing technology to create a mold, which is injected with polydimethylsiloxane (PDMS) and demold, distribute conductive tapes at equal distances on the PDMS film. Immerse the sensitive unit into a graphene suspension, remove it, dry it, and assemble it with a PDMS film to produce a cost-effective flexible pressure sensor. Sensor testing shows that the sensor has fast response time and recovery time, as well as good repeatability. The consistency of the sensor in various regions is good, with excellent endurance performance and low coupling between different regions of the sensor. High-resolution perception can be realized in an area of 9 mm × 9 mm (size of the finger pulp). To further demonstrate the high-resolution performance of the sensor, it is used to recognize Braille and perceive the roughness of the fruit surface. The sensor works well in the scenarios of miniaturization and fitting to a robot's finger. This study also lays a solid foundation for the design and development of the next sensors in miniaturization and high resolution.