Construction of laser-induced graphene/silver nanowire composite structures for low-strain,high-sensitivity flexible wearable strain sensors  

作　　者：YANG PingAn ZHAO JingYuan LI Rui ZHOU ZhiHao GUI YinGang SUN RuiXue WU DeCheng WANG XiaoJie 

机构地区：[1]School of Automation,Chongqing University of Posts and Telecommunications,Chongqing 400065,China [2]College of Engineering and Technology,Southwest University,Chongqing 400715,China [3]Bio-inspired Robotics and Intelligent Material Laboratory,Institute of Advanced Manufacturing Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Changzhou 213164,China

出　　处：《Science China(Technological Sciences)》2024年第11期3524-3534,共11页中国科学（技术科学英文版）

基　　金：supported by the Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJZDK202300606);Chongqing Municipal Natural Science Foundation(Grant No.CSTB2022NSCQ-MSX0380);National High-end Foreign Experts Introduction Plan(Grant No.G2022035005L);Chongqing Talent Plan of Overall Rationing System Project(Grant No.CQYC202203091156)。

摘　　要：Sandwich-structured flexible sensors based on graphene have high sensitivity and stability.When graphene is combined with a flexible substrate in a sandwich structure,the weak bonding between them compromises the sensor's stability and sensitivity at low strains.This presents challenges in monitoring subtle physiological activities,such as hand bending and pulse rate.For this purpose,laser-induced graphene(LIG)is proposed to be used to prepare flexible sensors in order to improve the sensitivity and stability of the sensors at low strains.Polydimethylsiloxane(PDMS)with low modulus and polyimide(PI)with rich carbon content are selected as precursor materials for LIG,and graphene is formed through laser induction.Subsequently,silver nanowires(Ag NWs)solution is added to LIG to give the sensor low strain and high sensitivity performance.When the PI/PDMS ratio is 1:3,the Ag NWs/LIG flexible strain sensor exhibits excellent sensitivity(GF=778.468)over a small strain range(8.76%-11.25%).Meanwhile,the sensor still shows excellent stability after 2000 cycle experiments.The Ag NWs/LIG flexible strain sensor shows good performance when placed on the back of the hand,around the eyes,etc.It is demonstrated that Ag NWs/LIG flexible strain sensors have good application potential in human physiological activity monitoring,health management and medical fields,and provide a low-strain,high-sensitivity sensor design strategy for flexible wearable devices.

关 键 词：flexible strain sensors high sensitivity strain range Ag NWs laser-induced graphene 

分 类 号：TB33[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置]