Flexible and highly-sensitive pressure sensor based on controllably oxidized MXene  

作　　者：Yanan Ma Yongfa Cheng Jian Wang Si Fu Mengjun Zhou Yue Yang Baowen Li Xin Zhang Ce-Wen Nan 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Center of Smart Materials and Devices&International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan,China [2]School of Mathematics,Physics and Optoelectronic Engineering,Hubei University of Automotive Technology,Shiyan,China [3]Center for Nanoscale Characterization&Devices(CNCD),Wuhan National Laboratory for Optoelectronics(WNLO),Huazhong University of Science and Technology(HUST),Wuhan,China [4]Information Materials and Intelligent Sensing Laboratory of Anhui Province,Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education,Institutes of Physical Science and Information Technology,Anhui University,Hefei,China [5]State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing,China

出　　处：《InfoMat》2022年第9期60-71,共12页信息材料（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:11904091,52072280,52102141;NSF of Hubei Province,Grant/Award Number:2021CFB051;Basic Science Center Program of NSFC,Grant/Award Number:51788104。

摘　　要：Conductive Ti_(3)C_(2)T_(x)MXenes have been widely investigated for the construction of flexible and highly-sensitive pressure sensors.Although the inevitable oxidation of solution-processed MXene has been recognized,the effect of the irreversible oxidation of MXene on its electrical conductivity and sensing properties is yet to be understood.Herein,we construct a highly-sensitive and degradable piezoresistive pressure sensor by coating Ti_(3)C_(2)T_(x)MXene flakes with different degrees of in situ oxidation onto paper substrates using the dipping-drying method.In situ oxidation can tune the intrinsic resistance and expand the interlayer distance of MXene nanosheets.The partially oxidized MXene-based piezoresistive pressure sensor exhibits a high sensitivity of 28.43 kPa^(-1),which is greater than those of pristine MXene,over-oxidized MXene,and state-of-the-art paper-based pressure sensors.Additionally,these sensors exhibit a short response time of 98.3 ms,good durability over 5000 measurement cycles,and a low force detection limit of 0.8 Pa.Moreover,MXene-based sensing elements are easily degraded and environmentally friendly.The MXene-based pressure sensor shows promise for practical applications in tracking body movements,sports coaching,remote health monitoring,and human–computer interactions.

关 键 词：adjustable sensitivity in situ oxidation interlayer distance MXene pressure sensor 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]