Highly Selective Biomimetic Flexible Tactile Sensor for Neuroprosthetics  

作　　者：Yue Li Zhiguang Cao Tie Li Fuqin Sun Yuanyuan Bai Qifeng Lu Shuqi Wang Xianqing Yang Manzhao Hao Ning Lan Ting Zhang 

机构地区：[1]i-Lab,Key Laboratory of Multifunctional Nanomaterials and Smart Systems,Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO),Chinese Academy of Sciences(CAS),398 Ruoshui Road,Suzhou 215123,China [2]School of Nano-Tech and Nano-Bionics,University of Science and Technology of China,96 Jinzhai Road,Hefei,Anhui 230026,China [3]Laboratory of Neurorehabilitation Engineering,School of Biomedical Engineering and Institute of Medical Robotics,Shanghai Jiao Tong University,1954 Huashan Road,Shanghai 20030,China [4]Center for Excellence in Brain Science and Intelligence Technology,Chinese Academy of Sciences,Shanghai 200031,China

出　　处：《Research》2020年第1期1648-1658,共11页研究（英文）

基　　金：The authors acknowledge the funding support from the National Key R&D Program of China(2017YFA0701101,2018YFB1304700);the National Natural Science Foundation of China(51702354,61801473);the Youth Promotion Association of Chinese Academy of Sciences(2020320);the Foundation Research Project of Jiangsu Province(SBK2020021442)。

摘　　要：Biomimetic flexible tactile sensors endow prosthetics with the ability to manipulate objects,similar to human hands.However,it is still a great challenge to selectively respond to static and sliding friction forces,which is crucial tactile information relevant to the perception of weight and slippage during grasps.Here,inspired by the structure of fingerprints and the selective response of Ruffini endings to friction forces,we developed a biomimetic flexible capacitive sensor to selectively detect static and sliding friction forces.The sensor is designed as a novel plane-parallel capacitor,in which silver nanowire-3D polydimethylsiloxane(PDMS)electrodes are placed in a spiral configuration and set perpendicular to the substrate.Silver nanowires are uniformly distributed on the surfaces of 3D polydimethylsiloxane microcolumns,and silicon rubber(Ecoflex^(■))acts as the dielectric material.The capacitance of the sensor remains nearly constant under different applied normal forces but increases with the static friction force and decreases when sliding occurs.Furthermore,aiming at the slippage perception of neuroprosthetics,a custom-designed signal encoding circuit was designed to transform the capacitance signal into a bionic pulsed signal modulated by the applied sliding friction force.Test results demonstrate the great potential of the novel biomimetic flexible sensors with directional and dynamic sensitivity of haptic force for smart neuroprosthetics.

关 键 词：FRICTION CAPACITANCE HIGHLY 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]