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.
Highlights
Flexible pressure sensors have been widely used in applications such as electronic skin, intelligent robots, and wearable devices[1,2,3,4,5,6,7]
The high-performance GR/PDMS sponge with high sensitivity, large operating range, rapid response time, low detection limit, good stability, recoverability, and repeatability was fabricated by adjusting graphene and NH4HCO3 concentrations
The fabricated GR/PDMS sponge can be cut into small pieces for use in the dielectric layer
Summary
Flexible pressure sensors have been widely used in applications such as electronic skin, intelligent robots, and wearable devices[1,2,3,4,5,6,7] These sensors have high-sensitivity, strong-flexibility, and implantable and wearable characteristics. Inductor-capacitor (LC) technology with its small size, low cost, high stability, and battery-free operation has become the best option for wireless transmission. Hitherto, it has been applied for wireless measurement of pressure[32,33,34,35,36,37,38], temperature[39,40], humidity[41], and specific components in sweat[42]. The fabricated sensor has the potential to be used in highly sensitive wireless detection for a wide range of applications, such as intelligent robots, bionic-electronic skin, and wearable electronic devices
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