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Tailorable Capacitive Tactile Sensor Based on Stretchable and Dissolvable Porous Silver Nanowire/Polyvinyl Alcohol Nanocomposite Hydrogel for Wearable human Motion Detection

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ADVANCED MATERIALS INTERFACES 2021年第20期8卷

作者： Wang, Peng Li, Guoxian Liu, Jun Hou, Zhanrui Meng, Chuizhou Guo, Shijie Liu, Changhong Fan, Shoushan Hebei Univ Technol Sch Mech Engn Hebei Key Lab Smart Sensing & Human Robot Interac State Key Lab Reliabil & Intelligence Elect Equip Tianjin 300401 Peoples R China Tsinghua Univ Dept Phys Tsinghua Foxconn Nanotechnol Res Ctr Beijing 100084 Peoples R China

Recently, advanced flexible tactile sensors have been widely studied for human motion detection, which is an essential part of human healthcare monitoring. New types of materials with novel composition and structures play a significant role in sensing performance improvement. Herein, a stretchable and dissolvable porous silver nanowire (Ag NW)/polyvinyl alcohol (PVA) nanocomposite hydrogel is fabricated through a facile foaming and freezing-thawing combined approach. The PVA gel is foamed with lots of tailorable micropores to achieve much enhanced stretchability and compressibility. Ag NWs are uniformly embedded inside PVA matrix to increase the permittivity upon introduction of numerous microcapacitors. Incorporated with carbon nanotube network electrodes, a capacitive tactile sensor is developed with high sensitivity (1.9 kPa(-1)), wide detection range (250 kPa), quick response time (25 ms), and remarkable stability over 10 000 loading/unloading cycles. Wearable sensing demonstration of detecting various human motions is performed. The hydrogel-based sensor can be dissolved in hot water within minutes with recycling use of electrode material, which is environmentally friendly. A large-area integrated sensor sheet can be made upon one fabrication process followed by cut into small sensor devices with desired shapes, indicating potential customized mass production. The proposed microporous nanocomposite hydrogel-based sensor is promising in wearable sensing applications.

关键词： hydrogel-based sensors nanocomposite dielectrics polyvinyl alcohol hydrogels silver nanowires stretchable sensors tactile sensors

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Self-Healing, Reconfigurable, Thermal-Switching, Transformative Electronics for Health Monitoring

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ADVANCED MATERIALS 2023年第15期35卷 2207742-2207742页

作者： Yang, Li Wang, Zihan Wang, Hao Jin, Biqiang Meng, Chuizhou Chen, Xue Li, Runze Wang, He Xin, Mingyang Zhao, Zeshang Guo, Shijie Wu, Jinrong Cheng, Huanyu Hebei Univ Technol Sch Hlth Sci & Biomed Engn State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Hebei Univ Technol Sch Mech Engn State Key Lab Reliabil & Intelligence Elect Equipm Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300401 Peoples R China Sichuan Univ Coll Polymer Sci & Engn State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China Hebei Univ Technol Sch Elect Engn State Key Lab Reliabil & Intelligence Elect Equipm Key Lab Bioelectromagnet & Neuroengn Hebei Prov Tianjin 300130 Peoples R China Penn State Univ Dept Engn Sci & Mech University Pk PA 16802 USA

Soft, deformable electronic devices provide the means to monitor physiological information and health conditions for disease diagnostics. However, their practical utility is limited due to the lack of intrinsical thermal switching for mechanically transformative adaptability and self-healing capability against mechanical damages. Here, the design concepts, materials and physics, manufacturing approaches, and application opportunities of self-healing, reconfigurable, thermal-switching device platforms based on hyperbranched polymers and biphasic liquid metal are reported. The former provides excellent self-healing performance and unique tunable stiffness and adhesion regulated by temperature for the on-skin switch, whereas the latter results in liquid metal circuits with extreme stretchability (>900%) and high conductivity (3.40 x 10(4) S cm(-1)), as well as simple recycling capability. Triggered by the increased temperature from the skin surface, a multifunctional device platform can conveniently conform and strongly adhere to the hierarchically textured skin surface for non-invasive, continuous, comfortable health monitoring. Additionally, the self-healing and adhesive characteristics allow multiple multifunctional circuit components to assemble and completely wrap on 3D curvilinear surfaces. Together, the design, manufacturing, and proof-of-concept demonstration of the self-healing, transformative, and self-assembled electronics open up new opportunities for robust soft deformable devices, smart robotics, prosthetics, and Internet-of-Things, and human-machine interfaces on irregular surfaces.

关键词： liquid metal printed circuits multifunctional electronic devices self-healing films thermal-switching three-dimensional conformal self-assembly transformative characteristics

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A droplet-based multivolume microfluidic device for digital polymerase chain reaction

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SENSORS AND ACTUATORS B-CHEMICAL 2022年第0期371卷

作者： Wei, Chunyang Yu, Chengzhuang Li, Shanshan Meng, Jiyu Li, Tiejun Cheng, Jingmeng Li, Junwei Hebei Univ Technol Sch Mech Engn Hebei Key Lab Robot Sensing & Human robot Interact Tianjin 300132 Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Hebei Univ Sci & Technol Sch Mech Engn Shijiazhuang 050091 Peoples R China Hebei Univ Technol Inst Biophys Sch Hlth Sci & Biomed Engn Tianjin 300401 Peoples R China Hebei Univ Technol Dept Comp Sci & Elect Engn Langfang 065000 Peoples R China

Digital PCR plays an essential role in detecting and quantifying nucleic acid targets. At the same time, there are still challenges in its applications, including reduction of cost, simplification of operations, and system miniaturization. This work proposes a droplet-based multivolume microfluidic device for easy-to-operate and integrated droplet digital PCR (ddPCR). With an "asymmetrical droplet-splitting" microstructure, we have successfully prepared both small and big droplets within the same main channel of the microfluidic chip. With the size of (59.1 +/- 2.2) mu m and (106.3 +/- 3.9) mu m in diameter, about 30,000 droplets are produced for multi-volume ddPCR, and thus to perform a dynamic range of over 10(4) for DNA molecule quantification. The chip integrates droplet generation, droplet array self-assembly, droplet dPCR, and fluorescence detection on a single device. The quantitative capability of the ddPCR chip was evaluated by measuring template DNA at concentrations from 20 to 12,500 *** L-1. Benefiting from the characteristics of the wide dynamic range (10 similar to 10(4) *** L-1), easy operation, and miniaturization, the proposed ddPCR device is expected to be used in applications involving DNA molecule quantification, including diagnosis of genetic disease, single-cell gene expression, and other biomedical fields.

关键词： Digital PCR Microfluidics Multivolume droplets Flexibility Miniaturization High dynamic range

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Pressure-driven dynamical microfluidic pumping system for droplet production

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JOURNAL OF INSTRUMENTATION 2022年第10期17卷 P10038页

作者： Yu, Chengzhuang Wei, Chunyang Li, Shanshan Meng, Jiyu Dai, Shijie Li, Junwei Hebei Univ Technol Sch Mech Engn Hebei Key Lab Robot Sensing & Human Robot Interact Tianjin 300132 Peoples R China Natl Key Lab Reliabil & Elect Equipment Tianjin 300130 Peoples R China Jiangnan Univ Jiangsu Key Lab Adv Food Mfg Equipment & Technol Wuxi 214122 Peoples R China Hebei Univ Technol Inst Biophys Sch Hlth Sci & Biomed Engn Tianjin 300130 Peoples R China Hebei Univ Technol Dept Elect & Informat Engn Langfang 065000 Peoples R China

Compact and affordable microfluidic pumping is critical for point-of-care applications. Here we proposed a data driven dynamical system to build up a pressure-driven microfluidic pump with a small budget. Firstly, a precision flow sensor is required to obtain the dynamic flow rates as the responses to the driven pressures. Then the flow rate dataset under varying operation pressures is used for data training and model-based system identification. With a first-order or second-order transfer function model, the specifications of pressure-driven microfluidic pumping system are analyzed by the model-based system identification algorithm. Also, all the specifications including the gain, time constant, natural frequency, and damping ratio are updated online as new test data are introduced from more experimental trials. To perform a non-bulky design purpose, the data training system identification is taken on a commercial smartphone. Once the training performance is satisfied, the pressure-driven system could be operated without any flow sensors. The system is used for two-phase flow controls as a demonstration, showing a rapid response of pumping. Dynamic characteristics and the effects of flow resistance on the pumping performance are analyzed to verify its suitability for a wide range of microfluidic applications.

关键词： Control and monitor systems online Counting gases and liquids Point-of-care devices

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Nucleic Acid Detection with Ion Concentration Polarization Microfluidic Chip for Reduced Cycle Numbers of Polymerase Chain Reaction

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MICROMACHINES 2022年第9期13卷 1394-1394页

作者： Yu, Chengzhuang Dai, Shijie Li, Shanshan Li, Junwei Hu, Hezhi Meng, Jiyu Wei, Chunyang Wu, Jie Jayne Hebei Univ Technol Sch Mech Engn Hebei Key Lab Smart Sensing & Human Robot Interac Tianjin 300130 Peoples R China Hebei Univ Technol Sch Elect Engn State Key Lab Reliabil & Intelligence Elect Equip Tianjin 300130 Peoples R China Hebei Univ Technol Sch Hlth Sci & Biomed Engn Inst Biophys Tianjin 300130 Peoples R China Hebei Univ Technol Dept Elect & Informat Engn Langfang 065099 Peoples R China Univ Tennessee Dept Elect Engn & Comp Sci Knoxville TN 37996 USA

Nucleic acid detection is widely used in disease diagnosis, food safety, environmental monitoring and many other research fields. The continuous development of rapid and sensitive new methods to detective nucleic acid is very important for practical application. In this study, we developed a rapid nucleic-acid detection method using polymerase chain reaction (PCR) combined with electrokinetic preconcentration based on ion concentration polarization (ICP). Using a Nafion film, the proposed ICP microfluidic chip is utilized to enrich the nucleic acid molecules amplified by PCR thermal cycles. To demonstrate the capability of the microfluidic device and the hybrid nucleic-acid detection method, we present an animal-derived component detection experiment for meat product identification applications. With the reduced cycle numbers of 24 cycles, the detection can be completed in about 35 min. The experimental results show that this work can provide a microfluidic device and straightforward method for rapid detection of nucleic acids with reduced cycle numbers.

关键词： microfluidic nucleic acid detection polymerase chain reaction electrokinetic preconcentration ion concentration polarization

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Superhydrophobic, stretchable kirigami pencil-on-paper multifunctional device platform

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CHEMICAL ENGINEERING JOURNAL 2023年第1期465卷 142774页

作者： Xue, Ye Wang, Zihan Dutta, Ankan Chen, Xue Gao, Peng Li, Runze Yan, Jiayi Niu, Guangyu Wang, Ya Du, Shuaijie Cheng, Huanyu Yang, Li Hebei Univ Technol Sch Hlth Sci & Biomed Engn State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Hebei Univ Technol Sch Mech Engn State Key Lab Reliabil & Intelligence Elect Equipm Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300401 Peoples R China Penn State Univ Dept Engn Sci & Mech University Pk PA 16802 USA Hebei Univ Technol Sch Elect Engn State Key Lab Reliabil & Intelligence Elect Equipm Key Lab Bioelectromagnet & Neuroengn Hebei Prov Tianjin 300130 Peoples R China Hebei Univ Technol Dept Elect Informat Tianjin 300130 Peoples R China Hebei Univ Technol Dept Architecture & Art Tianjin 300130 Peoples R China

Wearable electronics with applications in healthcare, human-machine interfaces, and robotics often explore complex manufacturing procedures and are not disposable. Although the use of conductive pencil patterns on cellulose paper provides inexpensive, disposable sensors, they have limited stretchability and are easily affected by variations in the ambient environment. This work presents the combination of pencil-on-paper with the hydrophobic fumed SiO2 (Hf-SiO2) coating and stretchable kirigami structures from laser cutting to prepare a superhydrophobic, stretchable pencil-on-paper multifunctional sensing platform. The resulting sensor exhibits a large response to NO2 gas at elevated temperature from self-heating, which is minimally affected by the variations in the ambient temperature and relative humidity, as well as mechanical deformations such as bending and stretching states. The integrated temperature sensor and electrodes with the sensing platform can accurately detect temperature and electrophysiological signals to alert for adverse thermal effects and cardiopulmonary diseases. The thermal therapy and electrical stimulation provided by the platform can also deliver effective means to battle against inflammation/infection and treat chronic wounds. The superhydrophobic pencil-onpaper multifunctional device platform provides a low-cost, disposable solution to disease diagnostic confirmation and early treatment for personal and population health.

关键词： Superhydrophobic Pencil-on-paper Multiparameter sensing Thermal therapy and electrical stimulation Personal and population health monitoring

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Vanadium Oxide-Doped Laser-Induced Graphene Multi-Parameter Sensor to Decouple Soil Nitrogen Loss and Temperature

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ADVANCED MATERIALS 2023年第14期35卷 2210322-2210322页

作者： Yang, Li Yan, Jiayi Meng, Chuizhou Dutta, Ankan Chen, Xue Xue, Ye Niu, Guangyu Wang, Ya Du, Shuaijie Zhou, Peng Zhang, Cheng Guo, Shijie Cheng, Huanyu Hebei Univ Technol Sch Hlth Sci & Biomed Engn State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Hebei Univ Technol Sch Mech Engn State Key Lab Reliabil & Intelligence Elect Equipm Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300130 Peoples R China Penn State Univ Dept Engn Sci & Mech University Pk PA 16802 USA Hebei Univ Technol Sch Elect Engn State Key Lab Reliabil & Intelligence Elect Equipm Key Lab Bioelectromagnet & Neuroengn Hebei Prov Tianjin 300130 Peoples R China Hebei Univ Technol Sch Architecture & Art Tianjin 300130 Peoples R China Tianjin Tianzhong Yimai Technol Dev Co Ltd Tianjin 300384 Peoples R China Minjiang Univ Coll Mat & Chem Engn Fujian Key Lab Funct Marine Sensing Mat Fuzhou 350108 Peoples R China

Monitoring nitrogen utilization efficiency and soil temperature in agricultural systems for timely intervention is essential for crop health with reduced environmental pollution. Herein, this work presents a high-performance multi-parameter sensor based on vanadium oxide (VOX)-doped laser-induced graphene (LIG) foam to completely decouple nitrogen oxides (NOX) and temperature. The highly porous 3D VOX-doped LIG foam composite is readily obtained by laser scribing vanadium sulfide (V5S8)-doped block copolymer and phenolic resin self-assembled films. The heterojunction formed at the LIG/VOX interface provides the sensor with enhanced response to NOX and an ultralow limit of detection of 3 ppb (theoretical estimate of 451 ppt) at room temperature. The sensor also exhibits a wide detection range, fast response/recovery, good selectivity, and stability over 16 days. Meanwhile, the sensor can accurately detect temperature over a wide linear range of 10-110 degrees C. The encapsulation of the sensor with a soft membrane further allows for temperature sensing without being affected by NOX. The unencapsulated sensor operated at elevated temperature removes the influences of relative humidity and temperature variations for accurate NOX measurements. The capability to decouple nitrogen loss and soil temperature paves the way for the development of future multimodal decoupled electronics for precision agriculture and health monitoring.

关键词： multi-parameter sensors nitrogen loss and soil temperature monitoring precision agriculture vanadium oxide-doped laser-induced graphene foam

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Rapid Microfluidic Mixing Method Based on Droplet Rotation Due to PDMS Deformation

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MICROMACHINES 2021年第8期12卷 901-901页

作者： Wei, Chunyang Yu, Chengzhuang Li, Shanshan Pan, Feng Li, Tiejun Wang, Zichao Li, Junwei Hebei Univ Technol Sch Mech Engn Hebei Key Lab Robot Sensing & Human Robot Interac Tianjin 300132 Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equip Tianjin 300130 Peoples R China Jiangsu Key Lab Adv Food Mfg Equipment & Technol Wuxi 214122 Jiangsu Peoples R China Hebei Univ Technol Sch Sci Inst Biophys Tianjin 300401 Peoples R China Hebei Univ Technol Dept Comp Sci & Elect Engn Langfang 065000 Peoples R China

Droplet-based micromixers have shown great prospects in chemical synthesis, pharmacology, biologics, and diagnostics. When compared with the active method, passive micromixer is widely used because it relies on the droplet movement in the microchannel without extra energy, which is more concise and easier to operate. Here we present a droplet rotation-based microfluidic mixer that allows rapid mixing within individual droplets efficiently. PDMS deformation is used to construct subsidence on the roof of the microchannel, which can deviate the trajectory of droplets. Thus, the droplet shows a rotation behavior due to the non-uniform distribution of the flow field, which can introduce turbulence and induce cross-flow enhancing 3D mixing inside the droplet, achieving rapid and homogenous fluid mixing. In order to evaluate the performance of the droplet rotation-based microfluidic mixer, droplets with highly viscous fluid (60% w/w PEGDA solution) were generated, half of which was seeded with fluorescent dye for imaging. Mixing efficiency was quantified using the mixing index (MI), which shows as high as 92% mixing index was achieved within 12 mm traveling. Here in this work, it has been demonstrated that the microfluidic mixing method based on the droplet rotation has shown the advantages of low-cost, easy to operate, and high mixing efficiency. It is expected to find wide applications in the field of pharmaceutics, chemical synthesis, and biologics.

关键词： microfluidics mixing droplet rotation PDMS deformation

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Graph attention mechanism with global contextual information for multi-label image recognition

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JOURNAL OF ELECTRONIC IMAGING 2021年第6期30卷 063031-063031页

作者： Ban, Xiaoxiao Li, Peihua Wang, Qilong Zhou, Shoujun Guo, Shijie Wang, Yuanquan Hebei Univ Technol Sch Artificial Intelligence Tianjin Peoples R China Dalian Univ Technol Sch Informat & Commun Engn Dalian Liaoning Peoples R China Chinese Acad Sci Shenzhen Inst Adv Technol Shenzhen Peoples R China Hebei Univ Technol Hebei Key Lab Robot Percept & Human Robot Interac Tianjin Peoples R China

Recent works have shown that multi-label image recognition is still a challenging task in computer vision due to the complicatedness and diversity of multi-label images. However, the existing works ignore the co-occurrence correlation and global contextual information between image space and objects. We present a model to solve these problems. On the one hand, we devise the graph attention mechanism to compute the hidden representations of different categories in multi-label images. It can specify different weights to different neighbor objects and well model the label dependency. On the other hand, we iterate the global contextual information by the second-order covariance pooling to enhance nonlinear modeling capability and use basic residual network to extract features. The proposed model is thoroughly evaluated on PASCAL VOC 2007 and MS-COCO datasets. Compared with classical ML-GCN, the model can better combine the image features and label embedding. Meanwhile, experiments show that it outperforms the state-of-the-art methods such as residual multi-layer perception, EfficientNet, and vision transformer. (C) 2021 SPIE and IS&T

关键词： deep learning multi-label modeling attention mechanism high-order statistic

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A direct written strain-insensitive temperature sensor based on a multi-polygonal structure for human temperature monitoring

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NANO ENERGY 2024年第PartA期131卷

作者： Wang, Peng Li, Yurui Cao, Jinjing Sun, Guifen Shao, Haiyan Fu, Xiuli Meng, Ying Meng, Chuizhou Li, Yang Univ Jinan Sch Mech Engn Jinan 250022 Peoples R China Hebei Univ Technol Minist Educ Intelligent Rehabil Device & Detect Te Hebei Key Lab Smart Sensing & Human Robot Interact Engn Res CtrState Key Lab Reliabil & Intelligence Tianjin 300401 Peoples R China Shandong Agr & Engn Univ Sch Informat Sci & Engn Jinan 250100 Peoples R China Univ Jinan Sch Informat Sci & Engn Shandong Prov Key Lab Network Based Intelligent Co Jinan 250022 Peoples R China Shandong Univ Sch Integrated Circuits Jinan 250101 Peoples R China Fudan Univ State Key Lab Integrated Chips & Syst Shanghai 200433 Peoples R China

Flexible temperature sensors show great potential in human health monitoring. However, sensitive materials and substrates of the reported temperature sensors have weak stretchability, mechanical compliance and breathability, which weakened the sensing stability and wearing comfort. Herein, a stretchable printed straininsensitive temperature sensor based on a multi-polygonal structure was developed. The highly printable temperature-sensitive ink preparation adopted a coagulation-assisted strategy by using polyvinyl alcohol (PVA) polymer as binder, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) and graphene (G) as temperature-sensitive materials. By designing the multi-polygonal structure, the temperature sensor shows excellent anti-strain ability (even at 40 % strain) and good compliance with elastic human skin. Owing to the PEDOT:PSS with high temperature-sensitivity, G with 2D structure and excellent thermal conductivity, thermoplastic polyurethane (TPU) nanofiber with microporous structure, the fabricated sensor has high sensitivity and fast response speed. Benefiting from the microchannel and hydrophobic properties of the nanofiber substrate, the sensor has outstanding breathability and sweat resistance, laying the foundation for long-term wear comfort. Meanwhile, an electromechanical system and 4x4 temperature array have been built and applied to monitor human temperature and recognize the temperature distribution of objects successfully. This study provides a practical and optimized method for real-time and stable monitoring of human health.

关键词： Wearable temperature sensor Multi-polygonal structure Strain-insensitive 3D printed Skin temperature monitoring

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