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High-Porosity Foam-Based Iontronic Pressure Sensor with superhigh sensitivity of 9280 kPa^(-1)

Nano-Micro Letters 2022年第2期14卷 12-23页

作者： Qingxian Liu Yuan Liu Junli Shi Zhiguang Liu Quan Wang Chuan Fei Guo School of Astronautics Harbin Institute of TechnologyHarbin 150001HeilongjiangPeople’s Republic of China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China Department of Civil and Environmental Engineering Shantou UniversityShantou 515063GuangdongPeople’s Republic of China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Physics and TcSUH University of HoustonHoustonTX 77204USA Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China Present Address:320 Crescent Village Circle Unit 1413 San JoseCA 95134USA

Flexible pressure sensors with high sensitivity are desired in the fields of electronic skins,human-machine interfaces,and health *** ionic soft materials with microstructured architectures 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 ***,the requirement of specific apparatus and the complex fabrication process to build such microstructures lead to high cost and low ***,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 *** 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 *** device also exhibits remarkable mechanical stability over 5,000 compression-release or bending-release *** 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.

关键词： High porosity Elastic modulus Compression deformation Iontronic pressure sensor superhigh sensitivity

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