Deep Eutectic Solvent Induced Porous Conductive Composite for Fully Printed Piezoresistive Pressure Sensor

Manufacturing flexible pressure sensor using scalable and straightforward process is highly desired for next‐generation wearable electronics and intelligent robots. Here, a fully printed pressure sensor is proposed using a newly developed porous conductive composite. The composite ink is prepared by simply mixing the polydimethylsiloxane (PDMS), carbon black (CB), and a deep eutectic solvent (DES). The DES induces phase segregation between the PDMS and CB and serves as a liquid template to form the porous structure during the annealing process. This spontaneously formed conductive architecture that has not been previously reported in a printable ink endows superior electrical–mechanical performance to the composites, and significantly simplifies the device fabrication of flexible pressure sensors. The developed pressure sensors exhibit comprehensive performance capabilities appropriate for the wearable device, human–machine interfaces, and robot tactile. A printable polydimethylsiloxane/carbon black composite that readily forms a porous conductive network is newly developed. Flexible pressure sensing devices scaled to 10 cm while thinner than 200 µm can be easily fabricated using a fully printing process. This work enables a facile preparation of high‐performance pressure sensors for applications in wearable devices and robotic tactile.