Wireless wide-range pressure sensor based on graphene/PDMS sponge for tactile monitoring

作者：Hairong Kou, Lei Zhang, Qiulin Tan, Guanyu Liu, Helei Dong, Wendong Zhang, Jijun Xiong · 发表于：Scientific Reports · 年份：2019 · DOI：10.1038/s41598-019-40828-8 · 被引用次数：176 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Gas Sensing Nanomaterials and Sensors、Conducting polymers and applications

Abstract We propose a flexible wireless pressure sensor, which uses a graphene/polydimethylsiloxane (GR/PDMS) sponge as the dielectric layer. The sponge is sandwiched between two surfaces of a folded flexible printed circuit with patterned Cu as the antenna and electrode. By adjusting graphene and NH4HCO3 concentrations, a composite with 20% concentration of NH4HCO3 and 2% concentration of graphene as the dielectric layer is obtained, which exhibits high sensitivity (2.2 MHz/kPa), wide operating range (0–500 kPa), rapid response time (~7 ms), low detection limit (5 Pa), and good stability, recoverability, and repeatability. In addition, the sensor is sensitive to finger bending and facial muscle movements for smile and frown, that are transmitted using wireless electromagnetic coupling; therefore, it has potential for a wide range of applications such as intelligent robots, bionic-electronic skin and wearable electronic devices.