Flexible pressure sensors with high sensitivity are desired in the fields of electronic skins,human-machine interfaces,and health monitoring.Employing ionic soft materials with microstructured archi-tectures in the functional layer is an effective way that can enhance the amplitude of capacitance signal due to generated electron double layer and thus improve the sensitivity of capacitive-type pressure sensors.However,the requirement of specific apparatus and the complex fabrication pro-cess to build such microstructures lead to high cost and low productivity.Here,we report a simple strategy that uses open-cell polyurethane foams with high porosity as a continuous three-dimensional network skeleton to load with ionic liquid in a one-step soak process,serving as the ionic layer in iontronic pressure sensors.The high porosity (95.4％) of PU-IL composite foam shows a pretty low Young's modulus of 3.4 kPa and good compressibility.A superhigh maximum sensitivity of 9,280 kPa-1 in the pressure regime and a high pressure resolution of 0.125％ are observed in this foam-based pressure sensor.The device also exhibits remarkable mechanical stability over 5,000 compression-release or bending-release cycles.Such high porosity of composite structure provides a simple,cost-effective and scalable way to fabricate super sensitive pressure sensor,which has prominent capability in applications of water wave detection,underwater vibration sensing,and mechanical fault monitoring.

Qingxian Liu;Yuan Liu;Junli Shi;Zhiguang Liu;Quan Wang;Chuan Fei Guo

School of Astronautics,Harbin Institute of Technology,Harbin 150001,Heilongjiang,People's Republic of China;Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,People's Republic of China;Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen 518055,Guangdong,People's Republic of China;Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen 518055,Guangdong,People's Republic of China;Department of Physics and TcSUH,University of Houston,Houston,TX 77204,USA;8320 Crescent Village Circle Unit 1413,San Jose,CA 95134,USA;Department of Mechanical Engineering,Massachusetts Institute of Technology,Cambridge,MA 02139,USA;Department of Civil and Environmental Engineering,Shantou University,Shantou 515063,Guangdong,People's Republic of China

纳微快报（英文）

[1]Qingxian Liu;Yuan Liu;Junli Shi;Zhiguang Liu;Quan Wang;Chuan Fei Guo-.High-Porosity Foam-Based Iontronic Pressure Sensor with Superhigh Sensitivity of 9280 kPa-1)[J].纳微快报（英文）,2022(02):12-23

Iontronic,Superhigh,soak,iontronic

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