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

作　　者：Qingxian Liu Yuan Liu Junli Shi Zhiguang Liu Quan Wang Chuan Fei Guo 

机构地区：[1]School of Astronautics,Harbin Institute of Technology,Harbin 150001,Heilongjiang,People’s Republic of China [2]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,People’s Republic of China [3]Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen 518055,Guangdong,People’s Republic of China [4]Department of Civil and Environmental Engineering,Shantou University,Shantou 515063,Guangdong,People’s Republic of China [5]Department of Mechanical Engineering,Massachusetts Institute of Technology,Cambridge,MA 02139,USA [6]Department of Physics and TcSUH,University of Houston,Houston,TX 77204,USA [7]Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen 518055,Guangdong,People’s Republic of China [8]Present Address:320 Crescent Village Circle Unit 1413,San Jose,CA 95134,USA

出　　处：《Nano-Micro Letters》2022年第2期12-23,共12页纳微快报（英文版）

基　　金：This work was financially supported by the funds of the National Natural Science Foundation of China(No.51903118 and U1613204);the Science Technology the Shenzhen Sci-Tech Fund(No.KYTDPT20181011104007);M.G.also thanks the support of“College Student’s Innovation and Entrepreneurship Program”(No.2018X33).Guangdong Provincial Key Laboratory Program(2021B1212040001)from the Department of Science and Technology of Guangdong Province;the“Guangdong Innovative and Entrepreneurial Research Team Program”under contract no.2016ZT06G587;the“Science Technology and Innovation Committee of Shenzhen Municipality”(Grant No.JCYJ20170817111714314).

摘　　要：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 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 sensors.However,the requirement of specific apparatus and the complex fabrication process 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.

关 键 词：High porosity Elastic modulus Compression deformation Iontronic pressure sensor Superhigh sensitivity 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]