Capacitive wearable tactile sensor based on smart textile substrate with carbon black /silicone rubber composite dielectric

Abstract

To achieve the wearable comfort of electronic skin (e-skin), a capacitive sensor printed on a flexible textile substrate with a carbon black (CB)/silicone rubber (SR) composite dielectric was demonstrated in this paper. Organo-silicone conductive silver adhesive serves as a flexible electrodes/shielding layer. The structure design, sensing mechanism and the influence of the conductive filler content and temperature variations on the sensor performance were investigated. The proposed device can effectively enhance the flexibility and comfort of wearing the device asthe sensing element has achieved a sensitivity of 0.02536%/KPa, a hysteresis error of 5.6%, and a dynamic response time of ~89 ms at the range of 0-700 KPa. The drift induced by temperature variations has been calibrated by presenting the temperature compensation model. The research on the time-space distribution of plantar pressure information and the experiment of the manipulator soft-grasping were implemented with the introduced device, and the experimental results indicate that the capacitive flexible textile tactile sensor has good stability and tactile perception capacity. This study provides a good candidate for wearable artificial skin.

Toward Fully Manufacturable, Fiber Assembly–Based Concurrent Multimodal and Multifunctional Sensors for e‐Textiles

“…While similarly strain‐reversible piezoresistive behavior has been previously reported for carbonaceous composites, our sensory texels can also be used for tactile sensing. Texel deformation due to compression should determine its tactile response; therefore, its cyclic stress–strain behavior under compression was determined (see Figure d).…”

Flexible and transparent capacitive pressure sensor with patterned microstructured composite rubber dielectric for wearable touch keyboard application

“…The change of dielectric constant of the AgNWs/PDMS composites under pressure can be interpreted by the Kirkpatrick and Zallen statistical percolation model [18,[29][30][31][32], which is used to predict the electrical properties of a percolation system with non-interacting randomly dispersed fillers. Here, the capacitance value C is as follows: .…”

“…However, the inherent characteristics of a single dielectric limit the further development of capacitive pressure sensors. Therefore, to increase the sensing performance, some effective methods have been investigated, including doping fillers in insulating elastic dielectrics [16][17][18][19][20], introducing the ordered microstructures to the dielectric [14,[20][21][22][23][24], changing the internal microstructure of the dielectric [15,25], and so on. For example, Schwartz et al [26] reported a flexible capacitive pressure sensor embedded capacitive sensing element with a microstructured elastomer layer which revealed a fast response within a millisecond range and a great mechanical flexibility.…”

Electric Conductivity and Piezoresistivity of Carbon Nanotube Artificial Skin Based on the Design of Mesh Structure

“…e thickness of arti cial skin is 1.7 mm, and the length of the side is 2.4 cm. We used four kinds of carbon nanotube lines to embed in the silica gel [14] arti cial skin, and the length of each line is 2.4 cm (same as the length of the side of arti cial skin). So we got 4 groups of di erent samples.…”