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Science China Chemistry 2023年第11期66卷 3314-3322页

作者： Wen-Ting Fan Yi Zhao Feng Hong Yan-Ling Liu Wei-Hua Huang College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China

Vascular endothelium can perceive fluid shear stress(FSS)and cyclic circumferential stretch(CCS)caused by the pulsatile blood flow,and translate the hemodynamics into biochemical signals to regulate vascular ***,existing methods provide little information about the real-time biochemical responses of endothelium when exposed to dynamic FSS and ***,a vasculature-on-a-chip integrated with stretchable sensing is engineered for recapitulating the hemodynamic milieus and in-situ monitoring biochemical responses of endothelial *** integrated device is developed by sandwiching a robust stretchable electrode between an upper fluidic channel and a lower pneumatic *** fluidic and pneumatic channels enable the simultaneous recapitulation of both FSS and CCS,and the integrated sensor exhibits excellent cell-adhesive capacity and electrochemical sensing stability even after long-term hemodynamic *** allow real-time monitoring of hemodynamic form-and duration-dependent endothelium responses,and further efficacy investigation about a recommended drug for COVID-19,demonstrating the great potential in vascular disease and drug screening.

关键词： vasculature-on-a-chip stretchable sensor hemodynamic forces electrochemical monitoring endothelium responses

3D Printing of stretchable Strain sensor Based on Continuous Fiber Reinforced Auxetic Structure

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第2期2卷 11-18页

作者： Wanquan Yan Xiaoyong Tian Daokang Zhang Yanli Zhou Qingrui Wang State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an710049China

stretchable strain sensors play a key role in motion detection and human-machine interface functionality,and deformation ***,their sensitivity is often limited by the Poisson effect of elastic *** this study,a stretchable strain sensor based on a continuous-fiber-reinforced auxetic structure was proposed and fabricated using a direct ink writing(DIW)3D printing *** application of multi-material DIW greatly simplifies the fabrication process of a sensor with an auxetic structure(auxetic sensor).The auxiliary auxetic struc-ture was innovatively printed using a continuous-fiber-reinforced polydimethylsiloxane composite(Fiber-PDMS)to balance the rigidity and flexibility of the *** increase in stiffness enhances the negative Poisson’s ratio effect of the auxetic structure,which can support the carbon nanotube-polydimethylsiloxane composite(CNT-PDMS)stretchable sensor to produce a significant lateral expansion when *** is shown that the structural Poisson’s ratio of the sensor decreased from 0.42 to−0.33 at 20%tensile strain,and the bidirectional tensile strain increases the sensor sensitivity by 2.52 times(gage factor to 18.23).The Fiber-PDMS composite maintains the excellent flexibility of the matrix *** auxetic sensor exhibited no structural damage af-ter 150 cycles of tension and the signal output exhibited high *** addition,this study demonstrates the significant potential of auxetic sensors in the field of deformation control.

关键词： 3D printing stretchable sensor Auxetic structure Continuous fiber Sensitivity Deformation control

Highly stretchable polymer/silver nanowires composite sensor for human health monitoring

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Nano Research 2020年第4期13卷 919-926页

作者： Yanjing Zhang Pei He Meng Luo Xiaowen Xu Guozhang Dai Junliang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Flexible strain sensors exhibit outstanding advantages in terms of sensitivity and stability by detecting changes in physical *** can be easily attached to human skin and clothed to achieve monitoring of human motion and ***,general sensing material shows low stretchability and cannot respond to signals under large *** this work,a highly stretchable polymer composite was developed by adding small amount(0.17 wt.%)of silver nanowires(AgNWs)in stretchable conductive polymer *** conductivity of polymer/AgNWs composite is 1.3 S/m with the stretchability up to 500%.The stretchable strain sensor based on the polymer/AgNWs composite can respond to strain signals in real time,even for 1%strain response,and shows excellent stability over 1,000 loading/unloading ***,the strain sensor can be attached to human skin and clothed to monitor joints,throat and pulse of the human *** human body electrocardiogram(ECG)signal was detected successfully with the polymer/AgNWs electrode,which is comparable to the signal obtained by the commercial ***,the sensors enable monitoring of human movement and *** advantages make it a potential application in wearable devices and electronic skin.

关键词： stretchable sensor silver nanowires health monitoring electrocardiogram

Ultrasmall barium titanate nanoparticles modulated stretchable dielectric elastomer sensors with large deformability and high sensitivity

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InfoMat 2023年第8期5卷 94-106页

作者： Zun-Peng Feng Ya-Nan Hao Jing Qin Shao-Long Zhong Ke Bi Yu Zhao Li-Juan Yin Jia-Yao Pei Zhi-Min Dang State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijingthe People's Republic of China State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijingthe People's Republic of China Beijing University of Posts and Telecommunications Research Institute Shenzhenthe People's Republic of China School of Electrical Engineering Zheng Zhou UniversityZhengZhouthe People's Republic of China

Large deformability and high sensitivity is difficult to be realized simultaneously in flexible ***,taking advantage of the high permittivity and highly active surfaces of the ultrasmall barium titanate nanoparticles(BT NPs)and the high stretchability of the p(BA-GMA)elastomer matrix,we propose a high-performance soft stretchable *** addition of the ultrasmall BT NPs can not only increase the permittivity and capacitance of polyacrylate-matrix composite dielectric material to obtain a high sensitivity,but also basically maintains the excellent mechanical properties of the polymer *** dielectric constants of the composite films increase from 5.68 to 13.13 at 10 kHz with the increase of BT NPs content from 0 to 15 vol.%,which results in a high capacitance of 236.16 pF for 15 vol.%BT/p(BA-GMA)*** the high permittivity and the large deformability(a maximal deformation of 87.2%),the 15 vol.%BT/p(BA-GMA)sensor has high sensitivity and shows high linearity and stable output even if under dynamic *** dual-mode sensor that utilizes the orthogonality of capacitance-resistance is designed,which shows excellent performance in monitoring human body movements and noncontact *** results present that the BT/p(BA-GMA)-based sensor has high stability and reliability not exceed 65C,which can meet the application requirements in dynamic monitoring.

关键词： barium titanate composite dielectric elastomer nanoparticles stretchable sensor

MWCNTs based flexible and stretchable strain sensors

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Journal of Semiconductors 2017年第5期38卷 18-23页

作者： Saeed Ahmed Khan Min Gao Yuechang Zhu Zhuocheng Yan Yuan Lin State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

Carbon nanotubes have potential applications in flexible and stretchable devices due to their remarkable electromechanical *** and stretchable strain sensors of multi-walled carbon nanotubes（MWCNTs）with aligned or random structures were fabricated on poly-dimethylsiloxane（PDMS） substrate with different *** was observed that the spraycoatedtechniquebased strain sensor fabricated on PDMS substrate showed higher sensitivity higher stretchability,better linearity and excellent longer time stability than the sensor fabricated with other methods presented in this *** scanning electron microscopy images indicated the spray coating technique can produce a better uniform and compact CNT network,which is the important role affecting the performance of CNT-based flexible strain sensors.

关键词： strain sensor stretchable sensor carbon nanotube arrays

Laser-Assisted Reduction of Highly Conductive Circuits Based on Copper Nitrate for Flexible Printed sensors

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Nano-Micro Letters 2017年第4期9卷 49-61页

作者： Shi Bai Shigang Zhang Weiping Zhou Delong Ma Ying Ma Pooran Joshi Anming Hu Institute of Laser Engineering Beijing University of Technology School of Civil and Transportation Engineering Beijing University of Civil Engineering and Architecture Oak Ridge National Laboratory Department of Mechanical Aerospace and Biomedical Engineering University of Tennessee Knoxville

stretchable electronic sensing devices are defining the path toward wearable electronics. High-performance flexible strain sensors attached on clothing or human skin are required for potential applications in the entertainment,health monitoring, and medical care sectors. In this work,conducting copper electrodes were fabricated onpolydimethylsiloxane as sensitive stretchable microsensors by integrating laser direct writing and transfer printing approaches. The copper electrode was reduced from copper salt using laser writing rather than the general approach of printing with pre-synthesized copper or copper oxide nanoparticles. An electrical resistivity of 96 l X cm was achieved on 40-lm-thick Cu electrodes on flexible substrates. The motion sensing functionality successfully demonstrated a high sensitivity and mechanical *** in situ fabrication method leads to a path toward electronic devices on flexible substrates.

关键词： Laser direct writing Copper circuit stretchable sensor Laser reduction

Review of flexible microelectromechanical system sensors and devices

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Nanotechnology and Precision Engineering 2021年第2期4卷 33-53页

作者： Xiaopeng Yang Menglun Zhang State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China

Today,the vast majority of microelectromechanical system(MEMS)sensors are mechanically rigid and therefore suffer from disadvantages when used in intimately wearable or bio-integrated *** applying new engineering strategies,mechanically bendable and stretchable MEMS devices have been successfully *** article reviews recent progress in this area,focusing on high-performance flexible devices based on inorganic thin *** start with the common design and fabrication strategies for flexibility and stretchability,summarize the recent application-oriented flexible devices,and conclude with criteria and opportunities for the future development of flexible MEMS sensors.

关键词： MEMS sensor Flexible electronics stretchable sensor