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Ultra-thin CoAl layered double hydroxide nanosheets for the construction of highly sensitive and selective QCM humidity sensor

查看全文 作　　者：Yongheng [1]Zhu;Xuhua [1]Dong;Jinsheng [5]Cheng;Lumin [3]Wang;Cheng [1]Zhao;Yonghui [4]Deng;Siqi [1]Xie;Yingjie [1]Pan;Yong [1]Zhao;Gengzhi [3]Sun;Tianjun [2]Ni 高影响力作者 机构地区：[1]College of Food Science and Technology,Laboratory of Quality&Safety Risk Assessment for Aquatic Products on Storage and Preservation(Shanghai),Ministry of Agriculture and Shanghai Engineering Research Center of Aquatic-Product Processing&Preservation Shanghai Ocean University,Shanghai 201306,China;[2]School of Basic Medicine,Xinxiang Medical University,Xinxiang 453003,China;[3]Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing Tech University(NanjingTech),Nanjing 211816,China;[4]Department of Chemistry,FudanUniversity,Shanghai 200433,China;[5]Henry-Fork School of Food Sciences,Shaoguan University,Shaoguan 512005,China高影响力机构 出　　处：《Chinese Chemical Letters》索引2023年第34卷第8期,共6页高影响力期刊 基　　金：supported by the Shanghai Natural Science Foundation(No.21ZR1427500);the Agricultural Project of Shanghai Science and Technology Innovation Action Plan(No.19391901600). 摘　　要：To achieve real-time monitoring of humidity in various applications,we prepared facile and ultra-thin CoAl layered double hydroxide(CoAl LDH)nanosheets to engineer quartz crystal microbalances(QCM).The characteristics of CoAl LDH were investigated by transmission electron microscopy(TEM),X-ray diffraction(XRD),X-ray photoelectric spectroscopy(XPS),Brunauer–Emmett–Telle(BET),atomic force microscopy(AFM)and zeta potential.Due to their large specific surface area and abundant hydroxyl groups,CoAl LDH nanosheets exhibit good humidity sensing performance.In a range of 11.3%and 97.6%relative humidity(RH),the sensor behaved an ultrahigh sensitivity(127.8 Hz/%RH),fast response(9.1 s)and recovery time(3.1 s),low hysteresis(3.1%RH),good linearity(R^(2)=0.9993),stability and selectivity.Besides,the sensor can recover the initial response frequency after being wetted by deionized water,revealing superior self-recovery ability under high humidity.Based on in-situ Fourier transform infrared spectroscopy(FT-IR),the adsorption mechanism of CoAl LDH toward water molecules was explored.The QCM sensor can distinguish different respiratory states of people and wetting degree of fingers,as well as monitor the humidity in vegetable packaging,suggesting excellent properties and a promising application in humidity sensing. 关 键 词：Layered double hydroxide nanosheets Quartz crystal microbalance Humidity sensor Respiratory monitoring Sensing mechanism
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