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Ultra-broadband microwave absorber and high-performance pressure sensor based on aramid nanofiber,polypyrrole and nickel porous aerogel

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1912-1921页

作者： Leyi Zhang Hongyu Jin Hanxin Liao Rao Zhang Bochong Wang Jianyong Xiang Congpu Mu Kun Zhai Tianyu Xue Fusheng Wen State Key Laboratory of Metastable Materials Science&Technology Yanshan UniversityQinhuangdao 066004China Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China

Electronic devices have become ubiquitous in our daily lives,leading to a surge in the use of microwave absorbers and wearable sensor devices across various sectors.A prime example of this trend is the aramid nanofibers/polypyrrole/nickel(APN)aerogels,which serve dual roles as both microwave absorbers and pressure *** this work,we focused on the preparation of aramid nanofibers/polypyrrole(AP15)aerogels,where the mass ratio of aramid nanofibers to pyrrole was 1:*** employed the oxidative polymerization method for the preparation *** this,nickel was thermally evaporated onto the surface of the AP15 aerogels,resulting in the creation of an ultralight(9.35 mg·cm^(-3)).This aerogel exhibited a porous *** introduction of nickel into the aerogel aimed to enhance magnetic loss and adjust impedance matching,thereby improving electromagnetic wave absorption *** minimum reflection loss value achieved was-48.7 dB,and the maximum effective absorption bandwidth spanned 8.42 GHz with a thickness of 2.9 *** impressive metrics can be attributed to the three-dimensional network porous structure of the aerogel and perfect impedance ***,the use of aramid nanofibers and a three-dimensional hole structure endowed the APN aerogels with good insulation,flame-retardant properties,and compression *** under a compression strain of 50%,the aerogel maintained its resilience over 500 *** incorporation of polypyrrole and nickel particles further enhanced the conductivity of the ***,the final APN aerogel sensor demonstrated high sensitivity(10.78 kPa-1)and thermal *** conclusion,the APN aerogels hold significant promise as ultra-broadband microwave absorbers and pressure sensors.

关键词： porous aerogel aramid nanofibers microwave absorbers pressure sensor porous structure

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Self-powered pressure sensor for ultra-wide range pressure detection

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Nano Research 2017年第10期10卷 3557-3570页

作者： Kaushik Parida Venkateswarlu Bhavanasi Vipin Kumar Ramaraju Bendi Pooi See Lee School of Materials Science and Engineering Nanyang Technological University Nanyang Avenue 639798 Singapore

The next generation of sensors should be self-powered, maintenance-free, precise, and have wide-ranging sensing abilities. Despite extensive research and development in the field of pressure sensors, the sensitivity of most pressure sensors declines significantly at higher pressures, such that they are not able to detect a wide range of pressures with a uniformly high sensitivity. In this work, we demonstrate a single-electrode triboelectric pressure sensor, which can detect a wide range of pressures from 0.05 to 600 kPa with a high degree of sensitivity across the entire range by utilizing the synergistic effects of the piezoelectric polarization and triboelectric surface charges of self-polarized polyvinyldifluoride-trifluoroethylene （P（VDF-TrFE）） sponge. Taking into account both this wide pressure range and the sensitivity, this device exhibits the best performance relative to that of previously reported self-powered pressure sensors. This achievement facilitates wide-range pressure detection for a broad spectrum of applications, ranging from simple human touch, sensor networks, smart robotics, and sports applications, thus paving the way forward for the realization of next-generation sensing devices. Moreover, this work addresses the critical issue of saturation pressure in triboelectric nanogenerators and provides insights into the role of the surface charge on a piezoelectric polymer when used in a triboelectric nanogenerator.

关键词： self-powered triboelectric piezoelectric nanogenerator pressure sensor

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Highly Sensitive Pseudocapacitive Iontronic pressure sensor with Broad Sensing Range

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Nano-Micro Letters 2021年第9期13卷 209-222页

作者： Libo Gao Meng Wang Weidong Wang Hongcheng Xu Yuejiao Wang Haitao Zhao Ke Cao Dandan Xu Lei Li School of Mechano-Electronic Engineering Xidian UniversityXian 710071ShaanxiP.R.China CityU-Xidian Joint Laboratory of Micro/Nano-Manufacturing Shenzhen 518057P.R.China Department of Mechanical Engineering City University of Hong KongKowloon 999077Hong Kong SARP.R.China Materials Interfaces Center Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongP.R.China State Key Laboratory for Mechanical Behavior of Materials Xian Jiaotong UniversityNo.28Xianning West RoadXian 710049ShaanxiP.R.China

Flexible pressure sensors are unprecedentedly studied on monitoring human physical activities and ***,improving the response sensitivity and sensing range of flexible pressure sensors is a great challenge,which hinders the devices’practical *** this obstacle,we developed a Ti_(3)C_(2)T_(x)-derived iontronic pressure sensor(TIPS)by taking the advantages of the high intercalation pseudocapacitance under high pressure and rationally designed structural *** achieved an ultrahigh sen-sitivity(S_(min)>200 kPa^(−1),S_(max)>45,000 kPa^(−1))in a broad sensing range of over 1.4 MPa and low limit of detection of 20 Pa as well as stable long-term working durability for 10,000 *** practical application of TIPS in physical activity monitoring and flexible robot manifested its versatile *** study provides a demonstration for exploring pseudocapacitive materials for building flexible iontronic sensors with ultrahigh sensitivity and sensing range to advance the development of high-performance wearable electronics.

关键词： Iontronic sensor Flexible electronics pressure sensor Pseudocapacitance Ti_(3)C_(2)T_(x)MXene

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THICKNESS-SHEAR VIBRATION OF CIRCULAR CRYSTAL PLATE IN CYLINDRICAL SHELL AS pressure sensor

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Applied Mathematics and Mechanics(English Edition) 2006年第6期27卷 749-755页

作者：胡元太崔之健蒋树农杨嘉实 Institute of Mechanics and Sensing Technology Central South University Changsha 410083P. R.China Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074P. R. China Department of Mechanics Huazhong University of Science and Technology Wuhan 430074P. R. China School of Petrolum Engineering Xi'an Shiyou UniversityXi'an 710065P. R. China Institute of Mechanics and Sensing Technology Central South University Changsha 410083P. R. China Department of Engineering Mechanics University of Nebraska LincolnNE 68588-0526USA

Based on the theory for small fields superposed on relatively larger fields in an electroelastic body, a theoretical analysis is performed on a circular plate thicknessshear crystal resonator sealed in a circular cylindrical shell for pressure measurement. A simple expression is obtained for pressure induced frequency shifts in the resonator, which is examined for design optimization. Numerical results show that the frequency shifts depend linearly on the pressure, and that or a smaller thickness ratio of the crystal plate a pressure sensor with a softer outer shell to the outer shell has higher sensitivity.

关键词： pressure sensor resonator biasing fields incremental fields frequency shift

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An Optical pressure sensor Based on MEMS

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稀有金属材料与工程 2006年第A3期35卷 476-478页

作者： Tong Zhang Sheng Qiang Frank Lewis Yalin Wu Xiaozhu Chi Harbin Institute of Technology Harbin 150001 China Automobile Electronic Engineering Technology Research and Development Center Harbin 150001 China The University of Texas at Arlington Arlington TX 76019 USA

An optical fiber pressure sensor has been developed for the measurement in human *** sensing element is possessed of a membrane structure,which is fabricated by *** fabrication process includes anisotropic wet etching on the silicon *** the transmitting source and signal light,a multimode optical fiber 50/125 μm (core/clad)in diameter was *** intensity of the light reflected back into the fiber varies with the membrane deflection,which is s function of *** deflection of the membrane by applied pressure can be mathematically described.

关键词： optical fiber pressure sensor MEMS

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A facile and cost-effective approach to fabrication of high performance pressure sensor based on graphene-textile network structure

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Progress in Natural Science:Materials International 2020年第3期30卷 437-442页

作者： Yanyan Fan Hongbin Zhao Feng Wei Yi Yang Tianling Ren Hailing Tu State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous Metals GRIMAT Engineering Institute Co. Ltd General Research Institute for Nonferrous Metals Institute of Microelectronics Tsinghua University Beijing National Research Center for Information Science and Technology (BNRist) Tsinghua University

High performance flexible pressure sensors have received tremendous attention due to the potential applications in wearable electronics and humanoid ***,a low-cost,time-saving fabrication strategy is reported to efficiently construct highly sensitive and scalable pressure sensors based on *** flexible pressure sensor was prepared through a dip coating approach where the graphene ink was used as the active material and textile with ordered network structure,serves as the flexible support *** increasing the number of layers of the textile,the pressure sensor could achieve a high linear sensitivity value of 0.23 kPa;,a broad pressure range from 0 to 140 kPa,and a durability over 800 *** was found that the network structure of the graphene-textile contributed to the enhancement of the sensing performance due to the piezoresistive effect resulting from the deformation of conductive ***,by virtue of its exceptional properties,it is demonstrate that the high performance flexible pressure sensor could be further used to detect human physiological signals,such as wrist pulse,finger press detection and walking state monitoring,indicating its promising potential to flexible and wearable electronics.

关键词： Graphene ink pressure sensor Flexible device Network structure textile Piezoresistive effect

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Highly sensitive flexible capacitive pressure sensor with a broad linear response range and finite element analysis of micro-array electrode

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Journal of Materiomics 2020年第2期6卷 321-329页

作者： Longquan Ma Xuecheng Yu Yuanyuan Yang Yougen Hu Xinyu Zhang Huayuan Li Xing Ouyang Pengli Zhu Rong Sun Ching-ping Wong Shenzhen Institute of Advanced Electronic Materials Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518005China School of Materials Science Shenzhen UniversityShenzhen518071China Shenzhen College of Advanced Technology University of Chinese Academy of SciencesShenzhen518055PR China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaUSA

With the continuous development of wearable electronics,health care and smart terminals,highly performance flexible pressure sensors present a huge application *** this study,by introducing the micro-array structured electrodes and dielectric layers with high dielectric constant,capacitive pressure sensor fabricated with a brand new preparation strategy and highly sensitive is *** prepared micro-array structure is the basis for sensors with high ***,the contact area between the two electrodes changes from linear to planar with the increased loading,which result in a wider linear responding *** addition,by introducing ceramic dielectric material-barium titanate(BT)fillers into the dielectric layer to increase it’s the dielectric constant,the sensitivity of the sensor shows two-fold ***,the sensitivity gradients can be tuned by changing the loading contents of BT ***,compared with parallel board capacitive sensors with ordinary dielectric layer,these sensors exhibit excellent performance as follow,high sensitivity(up to 4.9 kPa^(-1))under low pressure range(0-2500 Pa),low detection limit(pressure sensor can detect the pressure of the water droplets and monitor human movement *** the facile design and excellent comprehensive properties,the flexible pressure sensor provides a new approach to improve the sensitivity and shows a broad application prospects in the wearable electronics,health care and smart terminals.

关键词： pressure sensor Barium titanate Dielectric layer Micro-array structure Tunable sensitivity

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

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InfoMat 2022年第9期4卷 60-71页

作者： Yanan Ma Yongfa Cheng Jian Wang Si Fu Mengjun Zhou Yue Yang Baowen Li Xin Zhang Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices&International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina School of Mathematics Physics and Optoelectronic EngineeringHubei University of Automotive TechnologyShiyanChina Center for Nanoscale Characterization&Devices(CNCD) Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)WuhanChina Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefeiChina State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijingChina

Conductive Ti_(3)C_(2)T_(x)MXenes have been widely investigated for the construction of flexible and highly-sensitive pressure *** 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 ***,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 *** situ oxidation can tune the intrinsic resistance and expand the interlayer distance of MXene *** 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 ***,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 ***,MXene-based sensing elements are easily degraded and environmentally *** 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

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Design and Simulation of a Novel Wireless Passive SAW Soil pressure sensor

Design and Simulation of a Novel Wireless Passive SAW Soil P...

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第26届中国控制与决策会议

作者： WANG Xiaobo XIE Liqiang LI Juelong XING Jianchun KANG shuai College of Defense Engineering PLA University of Science& Technology

ISBN: (纸本)9781479937066

A novel wireless passive SAW（Surface Acoustic Wave） soil pressure sensor based on delay line theory is designed in this paper. The principle of the sensor is described, and also the mechanical properties analysis and Finite Element Simulation analysis about the piezoelectric substrate is done to verify the effectiveness of the sensor. With hollow cylindrical bottom sealing piezoelectric substrate, and not involving electron mobility inside the crystal, the sensor is immune to electromagnetic interference factors;moreover the piezoelectric substrate adopts ST-X cut quartz crystal materials that is little affected by temperature, so it is also not affected by temperature factor. sensors based on the principle of SAW, can form a complete sense of passive wireless sensor system. Therefore, compared to traditional pressure sensor, the sensor designed in this paper has a high accuracy and application flexibility.

关键词： pressure sensor SAW the delay line Finite Element Simulation

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An Optical pressure sensor Based on MEMS

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稀有金属材料与工程 2006年第S3期 476-478页

作者： Frank Lewis TX 76019 The University of Texas at Arlington Arlington USA

关键词： optical fiber pressure sensor MEMS

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