Iontronic Pressure Sensor with High Sensitivity and Linear Response over a Wide Pressure Range Based on Soft Micropillared Electrodes.
Science Bulletin(2021)
Southern Univ Sci & Technol
Abstract
Electronic skins and flexible pressure sensors are important devices for advanced healthcare and intelli-gent robotics.Sensitivity is a key parameter of flexible pressure sensors.Whereas introducing surface microstructures in a capacitive-type sensor can significantly improve its sensitivity,the signal becomes nonlinear and the pressure response range gets much narrower,significantly limiting the applications of flexible pressure sensors.Here,we designed a pressure sensor that utilizes a nanoscale iontronic inter-face of an ionic gel layer and a micropillared electrode,for highly linear capacitance-to-pressure response and high sensitivity over a wide pressure range.The micropillars undergo three stages of deformation upon loading:initial contact (0-6 kPa) and structure buckling (6-12 kPa) that exhibit a low and nonlinear response,as well as a post-buckling stage that has a high signal linearity with high sensitivity(33.16 kPa-1) over a broad pressure range of 12-176 kPa.The high linearity lies in the subtle balance between the structure compression and mechanical matching of the two materials at the gel-electrode interface.Our sensor has been applied in pulse detection,plantar pressure mapping,and grasp task of an artificial limb.This work provides a physical insight in achieving linear response through the design of appropriate microstructures and selection of materials with suitable modulus in flexible pressure sen-sors,which are potentially useful in intelligent robots and health monitoring.
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Key words
Iontronic interface,Linearity,Flexible pressure sensor,Mechanical matching
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