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Rare Metals 2021年第6期40卷 1597-1603页

作者： Zhen Yuan Hui-Ling Tai Yuan-Jie Su Guang-Zhong Xie Xiao-Song Du Ya-Dong Jiang State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

As humidity is one of the most widely demanded environmental parameters,the precision of its detection is *** advanced humidity sensor will improve the validity of the humidity monitoring *** this study,a facile chemical layer-by-layer self-assembly(CLS)method was developed for fabricating graphene oxide(GO)/polyethyleneimine(PEI)multilayer *** to the chemical bonding between the PEI and GO,and the intrinsic stickiness of the PEI,layered films with different numbers of layers were successfully prepared using the CLS method and confirmed through ultraviolet-visible(UV-Vis)spectroscopy and the mass loading of quartz crystal microbalance(QCM).Morphological measurements revealed that the roughness and thickness of the films increased exponentially with the number of *** GO/PEI films were deposited on QCM electrodes using the CLS method to produce the humidity *** humidity measurement results showed a high sensitivity(37.84 Hz/%RH)and rapid response/recovery(sensors.

关键词： humidity sensors Quartz crystal microbalance Graphene oxide Polyethyleneimine Self-assembly

Recent progress of diversiform humidity sensors based on versatile nanomaterials and their prospective applications

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Nano Research 2023年第10期16卷 11938-11958页

作者： Dongzhi Zhang Mengyu Wang Mingcong Tang Xiaoshuang Song Xixi Zhang Zhanjia Kang Xiaohua Liu Jianhua Zhang Qingzhong Xue State Key Laboratory of Heavy Oil Processing College of Control Science and EngineeringChina University of Petroleum(East China)Qingdao 266580China State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of Petroleum(East China)Qingdao 266580China

humidity sensors are of significance in various fields,such as environmental and food quality monitoring,industrial processing,wearable and flexible electronics,and human health ***-performance humidity sensors with high sensitivity,rapid response time,and good stability are of paramount importance in humidity *** this paper,diversiform humidity sensors with different sensing mechanisms are summarized,including resistive,impedance,capacitive,quartz crystal microbalance(QCM),surface acoustic wave(SAW),field-effect transistor(FET),and optical fiber humidity *** nanomaterials such as graphene,transition-metal chalcogenide,MXenes,black phosphorus(BP),boron nitride(BN),polymers,and nanofibers were promising building-blocks for constructing humidity *** latest progress in the wearable and flexible humidity sensors,and self-powered humidity sensors was *** diversiform applications of the humidity sensors with great prospects were demonstrated in various fields in terms of human respiratory monitoring,skin dryness diagnosing,fingertip approaching,and non-contact ***,the challenges and prospects of nanomaterials-based humidity sensors were discussed.

关键词： humidity sensors nanomaterials wearable humidity sensors self-powered humidity sensors human respiratory monitoring

Highly sensitive humidity sensors based on hexagonal boron nitride nanosheets for contactless sensing

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Nano Research 2023年第7期16卷 10279-10286页

作者： Hang Liu Jinxu Qin Xigui Yang Chaofan Lv Wentao Huang Fukui Li Chuang Zhang Yanran Wu Lin Dong Chongxin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of EducationSchool of Physics&MicroelectronicsZhengzhou UniversityZhengzhou 450052China Institute of Quantum materials and Physics Henan Academy of SciencesZhengzhou 450046China

humidity sensors with high sensitivity,rapid response,and facile fabrication process for contactless sensing applications have received considerable attention in recent ***,humidity sensors based on hexagonal boron nitride(h-BN)nanosheets that are synthesized by a facile ultrasonic process have been fabricated,which display an ultrahigh sensitivity of 28,384%at 85%relative humidity(RH),rapid response/recovery time(3.0/5.5 s),and long-term stability in a wide humidity detection range(11%-85%RH),superior to most of the reported humidity *** high sensitivity can be ascribed to the massive hydrophilic functional groups absorbed on the h-BN nanosheet *** from the high humidity sensing performances,contactless Morse code messaging and human writing and speech recognition have been *** work demonstrates the great potential of the high-performance h-BN nanosheet-based humidity sensors for future contactless sensing devices.

关键词： boron nitride humidity sensors contactless detection speech recognition

Laser direct writing of Ga_(2)O_(3)/liquid metal-based flexible humidity sensors

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Opto-Electronic Advances 2023年第7期6卷 30-39页

作者： Songya Cui Yuyao Lu Depeng Kong Huayu Luo Liang Peng Geng Yang Huayong Yang Kaichen Xu State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310030China School of Information and Electrical Engineering Hangzhou City UniversityHangzhou 310015China

Flexible and wearable humidity sensors play a vital role in daily point-of-care diagnosis and noncontact human-machine ***,achieving a facile and high-speed fabrication approach to realizing flexible humidity sensors remains a *** this work,a wearable capacitive-type Ga_(2)O_(3)/liquid metal-based humidity sensor is demonstrated by a one-step laser direct writing *** to the photothermal effect of laser,the Ga_(2)O_(3)-wrapped liquid metal particles can be selectively sintered and converted from insulative to conductive traces with a resistivity of 0.19Ω·cm,while the untreated regions serve as active sensing layers in response to moisture *** 95%relative humidity,the humidity sensor displays a highly stable performance along with rapid response and recover *** these superior properties,the Ga_(2)O_(3)/liquid metal-based humidity sensor is able to monitor human respiration rate,as well as skin moisture of the palm under different physiological states for healthcare monitoring.

关键词： laser direct writing liquid metal humidity sensors flexible electronics wearable sensors

A chitosan/amido-graphene oxide-based self-powered humidity sensor enabled by triboelectric effect

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Rare Metals 2021年第8期40卷 1995-2003页

作者： Bo-Hao Liu Guang-Zhong Xie Cheng-Zhen Li Si Wang Zhen Yuan Zai-Hua Duan Ya-Dong Jiang Hui-Ling Tai State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu610054China

In this work,amido-graphene oxide(GO-NH_(2))loaded chitosan(CTS)composite material(CTS/GO-NH_(2))that acts as both the triboelectric and sensing film was prepared on rotary fan-shaped triboelectric nanogenerator for humidity *** with the pristine CTSbased triboelectric humidity sensor(CTS-THS)and GONH_(2)-THS,the CTS/GO-NH_(2)-based humidity sensor exhibited higher humidity response and better linearity in the relative humidity(RH)range of 18.7%RH-91.5%*** above results can be explained by the massive exposed and less concealed hydrophilic functional groups of CTS with the help of the wrinkle structure of GO-NH_(2).Meanwhile,the CTS/GO-NH_(2)-THS possessed good repeatability and acceptable hysteresis(~6.2%RH).Finally,a humidity sensing mechanism coupling triboelectric contact charging effect with electrons transfer principle under moisture environment was established to interpret the enhanced humidity sensing performance of the composite film-based *** work demonstrates that CTS/GONH_(2) composite film can be utilized to fabricate humidity sensors based on the triboelectric effect.

关键词： Chitosan Amido-graphene oxide Triboelectric nanogenerator humidity sensors Hydrogen bonding interaction

Outstanding humidity Chemiresistors Based on Imine-Linked Covalent Organic Framework Films for Human Respiration Monitoring

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Nano-Micro Letters 2023年第9期15卷 368-383页

作者： Xiyu Chen Lingwei Kong Jaafar Abdul-Aziz Mehrez Chao Fan Wenjing Quan Yongwei Zhang Min Zeng Jianhua Yang Nantao Hu Yanjie Su Hao Wei Zhi Yang Key Laboratory of Thin Film and Microfabrication(Ministry of Education) Department of Micro/Nano ElectronicsSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Human metabolite moisture detection is important in health monitoring and non-invasive ***,ultra-sensitive quantitative extraction of respiration information in real-time remains a great ***,chemiresistors based on imine-linked covalent organic framework(COF)films with dual-active sites are fabricated to address this issue,which demonstrates an amplified humidity-sensing signal *** regulation of monomers and functional groups,these COF films can be pre-engineered to achieve high response,wide detection range,fast response,and recovery *** the condition of relative humidity ranging from 13 to 98%,the COFTAPB-DHTA film-based humidity sensor exhibits outstanding humidity sensing perfor-mance with an expanded response value of 390 ***,the response values of the COF film-based sensor are highly linear to the relative humidity in the range below 60%,reflecting a quantitative sensing mechanism at the molecular *** on the dual-site adsorption of the(-C=N-)and(C-N)stretching vibrations,the revers-ible tautomerism induced by hydrogen bonding with water molecules is demonstrated to be the main intrinsic mechanism for this effective humidity *** addition,the synthesized COF films can be further exploited to effectively detect human nasal and oral breathing as well as fabric permeability,which will inspire novel designs for effective humidity-detection devices.

关键词： Covalent organic frameworks humidity sensors Reversible tautomerism Non-invasive diagnosis Health monitoring

Optical humidity-sensitive mechanism based on refractive index variation

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Chinese Optics Letters 2009年第9期7卷 756-759页

作者：王珍媛顾铮■ College of Optoelectric and Electric Information Engineering University of Shanghai for Science and Technology Laboratory of Photo-Electric Functional Films College of ScienceUniversity of Shanghai for Science and Technology

A novel composite model is put forward for humidity-sensitive material based on Maxwell-Garnett and effective medium theory. The analytical expression of the relation between effective refractive index and relative humidity is shown with different absorption factors and porosities. The larger the absorption factor is, the higher the refractive index is. The refractive index of humidity-sensitive SiO2 film decreases with the increase of ceramic material porosity. The sensitivity of optical humidity sensor can reach the magnitude of 10-3. In comparison with the experimental humidity-sensing curve by the method of p-polarized reflectance and the analysis of mechanism, theoretical simulation is in agreement with experimental results. Therefore, this composite model is proved to be reasonable which lays new theoretical foundation in further research on optical humidity sensor.

关键词： Absorption Ceramic materials Garnets humidity sensors Light refraction Moisture Refractive index Refractometers Silicon compounds

Recent Progress in Cellulose-Based Flexible sensors

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Journal of Renewable Materials 2022年第9期10卷 2319-2334页

作者： Ningli An Jingxuan Qin Xing Zhou Quandai Wang Changqing Fang Jiapeng Guo Bin Nan Faculty of Printing Packaging Engineering and Digital Media TechnologyXi’an University of TechnologyXi’an710048China School of Mechanical and Precision Instrument Engineering Xi’an University of TechnologyXi’an710048China

Flexible sensors are attractive due to potential applications in body exercise and ambient gas monitoring *** and its derivatives have combined superiorities such as intrinsic and structural flexibility,ease of chemical functionalization,moisture sensitivity,and mechanical stability,enabling them to be promising candidates as flexible supporting substrates and flexible sensitive *** progress consequently has been achieved to improve mechanical,electrical,and chemical *** latest advance in materials synthesis,structure design,fabrication control,and working mechanism of novel cellulose-based flexible sensors are reviewed and discussed,including strain sensors,humidity sensors,and harmful gas *** strategies were summarized to enhance sensor performance by surface group modifications,inorganic and organic conducting fillers optimization,multilayer structure *** emerged processing techniques of self-assembly,vacuum filtration,and 3D printing were introduced as well to construct multiscale *** integration of multiple sensors toward smart and healthy exercise monitoring system is briefly *** facing challenges and future opportunities of cellulose-based flexible sensors were discussed and proposed at the *** review provides inspiration and guidelines on how to design and fabricate cellulose-based flexible sensors.

关键词： Cellulose flexible sensors gas sensors humidity sensors strain sensors

Design of ispPAC-based humidity Sensor Signal Processing Circuits

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稀有金属材料与工程 2006年第A03期35卷 363-365页

作者： Duren Liu Jin Liu Zhichun Ren Xidian University Xi＇an 710071 China

The widely used sensitive elements of humidity sensors can be divided into 3 types,i.e.,resistor,capacitor,and *** sensors consisting of these sensitive elements have corresponding signal processing circuit unique to each type of sensitive *** paper presents an ispPAC (in-system programmable Programmable Analog Circuit) -based humidity sensor signal processing circuit designed with software method and implemented with in-system programmable *** operation shows that humidity sensor signal processing circuits of this kind,exhibit stable and reliable performance.

关键词： programmable analog circuit humidity sensors signal processing circuit

Physical sensors for skin-inspired electronics

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InfoMat 2020年第1期2卷 184-211页

作者： Shuo Li Yong Zhang Yiliang Wang Kailun Xia Zhe Yin Huimin Wang Mingchao Zhang Xiaoping Liang Haojie Lu Mengjia Zhu Haomin Wang Xinyi Shen Yingying Zhang Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijingChina

Skin,the largest organ in the human body,is sensitive to external *** recent years,an increasing number of skin-inspired electronics,including wearable electronics,implantable electronics,and electronic skin,have been developed because of their broad applications in healthcare and *** sensors are one of the key building blocks of skin-inspired *** physical sensors include mechanical sensors,temperature sensors,humidity sensors,electrophysiological sensors,and so *** this review,we systematically review the latest advances of skin-inspired mechanical sensors,temperature sensors,and humidity *** working mechanisms,key materials,device structures,and performance of various physical sensors are summarized and discussed in *** applications in health monitoring,human disease diagnosis and treatment,and intelligent robots are *** addition,several novel properties of skin-inspired physical sensors such as versatility,self-healability,and implantability are ***,the existing challenges and future perspectives of physical sensors for practical applications are discussed and proposed.

关键词： electronics skin flexible electronics humidity sensors mechanical sensors temperature sensors wearable sensors