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

Abstract

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.

Printed Low-Hysteresis Stretchable Strain Sensor Based on a Self-Segregating Conductive Composite

“…In addition, with the same loading of CB, our SSCC shows a conductivity that is 4 orders of magnitude higher and a low elastic modulus that is one-third of that of random PDMS/CB composites. Compared with the previous report, this work provides not only a new stretchable strain sensor with high performance and facile fabrication but also new insight into our understanding of the hysteresis behavior of stretchable conductive composites. For practice use, our SSCC sensor showed a comprehensive performance for monitoring parameters such as pulse waves and breath rate and full-range human body motions, including hand gestures and elbow bending.…”

“…We recently reported a porous conductive composite based on PDMS, CB, and a deep eutectic solvent (DES), in which 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. 24 The compression of the porous structure leads to changes in the resistance of the composite, thus enabling a tactile sensing performance. However, the effect of the phase segregation between the PDMS and CB on the composite's electromechanical properties has not yet been revealed.…”

An Effective Methodology for Achieving Highly Reliable Physical Sensors with High Sensitivity and Low Hysteresis through Parallel‐Structured Piezoresistors

“…Piezoresistivetype physical strain and pressure sensors are typically composed of active sensing materials combined with elastomeric polymers as a sensing medium. [11][12][13][14][15][16][17][18][19][20][21][22] MXene, conductive polymers (e.g., poly(3,4-ethylenedi oxythiophene):polystyrene sulfonate (PEDOT:PSS)), [12] metallic materials (e.g., silver nanowires, silver nanoparticles, liquid metal), [13][14][15] and advanced carbon materials [15][16][17][18][19]26] (e.g., carbon nanotubes (CNTs), graphene, graphite nanoplatelets, and carbon black), [16][17][18][19] etc. have been widely used as active sensing materials in piezoresistive physical sensor films.…”

A Hybrid Multifunctional Physicochemical Sensor Suite for Continuous Monitoring of Crop Health

“…As the pressure increased, the resistance of the pressure sensor decreased (Fig. 2g), con rming the negative pressure coe cient of resistance of PDMS:DES:CB [51] . The strain sensor was calibrated for various angles of curvature, as shown in Fig.…”