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All-Gel-Based Triboelectric Noncontact Sensor for human Motion Perception

ACS APPLIED MATERIALS & INTERFACES 2025年第14期17卷 21491-21500页

作者： Wang, Shanping Wan, Haicheng Lv, Yu Wang, Peng Meng, Chuizhou Shandong Huayu Univ Technol Sch Elect Engn Dezhou 253000 Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equipm Hebei Key Lab Smart Sensing & Human Robot Interact Engn Res CtrMinist Educ Intelligent Rehabil Devic Tianjin 300401 Peoples R China Univ Jinan Sch Mech Engn Jinan 250022 Peoples R China

Flexible noncontact sensors are of great significance in contemporary applications. Nevertheless, conventional noncontact sensors that rely on metal electrodes have limited flexibility, and their multilayer architectures are likely to experience interfacial delamination during extended use. To tackle these problems, we introduce an all-gel-based flexible triboelectric noncontact sensor, which consists of two parts, i.e., the gelatin/poly(vinyl alcohol) (PVA)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/graphene (G) electrode hydrogel and PVA/cellulose/carbon nanotubes (CNT) triboelectric aerogel. The hydrogel electrode not only features outstanding biocompatibility but also exhibits high conductivity. The triboelectric aerogel demonstrates excellent mechanical properties, such as good elasticity and durability. This sensor can stably output a noncontact current of 1.18 mu A, a charge of 18.4 nC/cm2, and a voltage of 3.7 V at a stable state. It can accurately and reliably detect a wide range of human motions, such as elbow bending, knee movement, and running, providing a reliable and flexible approach for human motion perception and facilitating the progress of relevant fields.

关键词： gel-based triboelectric noncontact sensor human motion perception hydrogel and aerogel triboelectric gel

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In2O3-ZnO/Laser-Induced Graphene Nanocomposites for a Highly Sensitive, Room-Temperature, Flexible Methane Gas Sensor

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ACS APPLIED NANO MATERIALS 2025年第15期8卷 7510-7519页

作者： Yang, Li Fu, Wenyuan Mao, Longbiao Xu, Luxiang Yao, Chengpeng Zhang, Hui 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 Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300130 Peoples R China Hebei Univ Technol Sch Elect Engn State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Penn State Univ Dept Engn Sci & Mech University Pk PA 16802 USA

Real-time monitoring of methane can alert for explosion or health issues, but it is still difficult to detect methane with high sensitivity and low detection limit at room temperature. This work reports a highly sensitive room-temperature methane gas sensor based on heterojunction nanocomposites between n-type indium-zinc oxide (In2O3-ZnO) and p-type porous laser-induced graphene (LIG) prepared by laser direct writing and facile spray coating. The resulting In2O3-ZnO/LIG-based methane gas sensor exhibits a large response of -27.48% to 500 ppm methane room temperature, a fast response/recovery time of 48/169 s, and an experimentally demonstrated ultralow detection limit of 3 ppm. After confirming the stable response over 9 days and against bending with a radius of curvature down to 10 mm, the In2O3-ZnO/LIG gas sensors are further combined with a wireless powering and transmitting module into an integrated methane gas sensing device to wirelessly detect methane in real time for early warning and safe evacuation in mining and fertilizer plants.

关键词： laser-induced graphene (LIG) nanocomposites In2O3-ZnO heterojunction room-temperaturemethane detection wireless wearable gas sensors mine and industrial methane monitoring

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Deep Learning Model-Based Turn-Over Intention Recognition of Array Air Spring Mattress

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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2025年第10期50卷 7663-7676页

作者： Meng, Fanchao Liu, Teng Meng, Chuizhou Zhang, Jianjun Zhang, Yifan Guo, Shijie Hebei Univ Technol Engn Res Ctr Minist Educ Intelligent Rehabil Equipment & Detect Tianjin 300130 Peoples R China Hebei Univ Technol Hebei Key Lab Smart Sensing & Human Robot Integrat Tianjin 300130 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300130 Peoples R China Civil Aviat Univ China Sch Comp Sci & Technol Tianjin 300300 Peoples R China

Turn-over intention recognition of patient is crucial for the advancement of the intelligent nursing field. In this paper, a novel turn-over intention method is proposed based on array air spring mattress. For this method, the turn-over intention of a lying patient can be recognized by identifying the internal pressure distribution of array air springs. To begin with, the samples of turn-over intention are created experimentally, and then input into a model combining Variational Auto-Encoder and Generative Adversarial Network for the sample augmentation to address issues related to low accuracy and poor generalization caused by sample imbalance. Besides, the augmented dataset is conveyed into the Convolutional Neural Network model, for the detection of three states: left/right turn-over intentions and no intention. The research demonstrates that, the similarity of the left and right turn-over intention samples generated by VAE-GAN model is 90.13% and 91.01%, respectively. This increases the diversity of samples and is helpful for intention recognition. The recognition accuracy of the CNN model with sample augmentation is 98.04%, which is 13.4% higher than without sample augmentation. The proposed method is effective to turn-over intention recognition, by identifying the internal pressure distribution of array air spring mattress. The efficiency of intelligent nursing systems can be substantially improved, thus ensuring better patient care and safety.

关键词： Air spring Deep learning Intelligent nursing Internal pressure Turn-over intention

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Investigation of co-flow step emulsification (CFSE) microfluidic device and its applications in digital polymerase chain reaction (ddPCR)

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JOURNAL OF COLLOID AND INTERFACE SCIENCE 2025年第PartA期678卷 1132-1142页

作者： Wei, Chunyang Lv, Wei Ding, Yanjing Wang, Chen Sun, Chengduo Feng, Xinhang Zhang, Tianqi Li, Junwei Li, Qinghua Li, Shanshan Shandong First Med Univ & Shandong Acad Med Sci Coll Med Informat & Artificial Intelligence Jinan 250117 Peoples R China Shandong Univ Tradit Chinese Med Dept Pharm Jinan 250399 Peoples R China Hebei Univ Technol Inst Biophys Sch Hlth Sci & Biomed Engn Tianjin 300401 Peoples R China Shandong First Med Univ & Shandong Acad Med Sci Coll Radiol Jinan 250117 Peoples R China Hebei Univ Technol Sch Mech Engn Hebei Key Lab Robot Sensing & Human Robot Interact Tianjin 300132 Peoples R China

Hypothesis: The co-flow step emulsification (CFSE) is very sensitive to the two-phase fluid interfaces, we conjecture that the CFSE hydrodynamic model depends on several key factors and the droplet generation process can be precisely controlled, thus to obtain droplet emulsions with the "ultra-high volume fraction of inner-phase" and "flexible droplet size" characteristics. The resulting droplets are expected to be applied to droplet digital PCR (ddPCR) with "high information density" and "wide dynamic range" advances. Experiments: By combining numerical simulation and fluid dynamics experiments, we have investigated the crucial parameters affecting the CFSE two-phase interface and finally achieved the prediction and guidance for CFSE droplet production. Findings: With the help of the CFSE device, multivolume droplet populations were produced on demand. Then, ddPCR tests were performed with DNA concentrations from 10 copies/mu L to 20,000 copies/mu L. The CFSE device owns an ultra-wide dynamic range (up to 5 orders of magnitude), showing excellent quantification ability of nucleic acid targets.

关键词： Co-flow step emulsification (CFSE) Ultra-high droplet volume fraction Adjustable droplet volume Droplet digital PCR (ddPCR)

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Highly sensitive and fast response/recovery ammonia sensor based on PANI/LIG at room temperature

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SENSORS AND ACTUATORS B-CHEMICAL 2025年 437卷

作者： Yang, Li Mao, Longbiao Du, Shuaijie Wang, Zihan Fu, Wenyuan Yao, Chengpeng Xu, Luxiang Zhang, Hui Cheng, Huanyu Hebei Univ Technol Sch Hlth Sci & Biomed Engn State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Tianjin Tianzhong Yimai Technol Dev Co Ltd Tianjin 300130 Peoples R China Hebei Univ Technol Sch Elect Engn State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300130 Peoples R China Hebei Univ Technol Sch Mech Engn 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

Real-time and accurate detection of ammonia in the environment provides timely alarm for excessive exposure or food spoilage. However, metal oxide-based ammonia gas sensors often need to operate at high temperatures (200-400 degrees C) and conductive polymer-based ammonia gas sensors suffer from long response/recovery time, which are challenging for real-time wearable applications. Meanwhile, three-dimensional porous laser-induced graphene (LIG) features simple preparation, high carrier mobility, good conductivity, and large specific surface area, presenting opportunities to further combine with conductive polymers for enhanced performance. This work reports a highly sensitive and selective, room-temperature ammonia sensor with fast response/recovery based on polyaniline (PANI)/laser-induced graphene (LIG) composite fabricated by one-step laser direct writing with spraying. The sensor with optimized composite ratio and operating conditions exhibits a large response of 68 % to 60 ppm ammonia with a rapid response/recovery time of 53/167 s, together with a demonstrated detection limit of 5 ppm. Together with the miniaturized data acquisition module and integrated APP, the integrated wireless ammonia detection system demonstrates the capability to accurately detect the ammonia concentration in real time for meat preservation, health protection, and smart agriculture.

关键词： Polyaniline/laser-induced graphene (PANI/ LIG) composites Laser direct writing Highly sensitive room-temperature ammonia sensors Meat preservation and meat preservation

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Thermoelectric Composites Based on Porous Laser-Induced Graphene and Ion Hydrogel

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ACS APPLIED MATERIALS & INTERFACES 2025年第14期17卷 21773-21784页

作者： Zhang, Hui Yang, Houze Xin, Mingyang Wang, Zihan Zhang, Hongyu Dutta, Ankan Cheng, Huanyu Yang, Li 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 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 Hebei Univ Technol Sch Architecture & Art Tianjin 300130 Peoples R China Penn State Univ Dept Engn Sci & Mech University Pk PA 16802 USA Tianzhong Yimai Technol Dev Co Ltd Tianjin 300392 Peoples R China

Despite the rapid development of single-modal flexible sensors, there is an urgent need to develop self-powered multimodal flexible sensing devices to eliminate power constraints. This work reports stretchable thermoelectric composites based on porous laser-induced graphene foams and an ion hydrogel, aiming to create a self-powered sensor that can detect temperature changes and strain with high accuracy. The self-powered strain sensor based on 3D porous laser-induced graphene (LIG) foam exhibits a high maximum sensitivity of 105.9 for strain up to 30%, a low detection limit of 0.071%, and good stability over 5,000 cycles at 30% strain. With an increased Seebeck coefficient of -189.90 mu V/K, the sensor can also detect temperatures in the range of -10-100 degrees C with a resolution of 0.1 degrees C. The thermoelectric power generation array with integrated units can achieve an output voltage of 104.18 mV for a temperature difference of 20 degrees C. By combining the electronic thermoelectric material LIG and the ionic thermoelectric material NKKC/PFF, the dual-parameter sensors demonstrate high potential in human health monitoring, smart storage, and bathroom systems. The reported thermoelectric composites can be further utilized in temperature-strain decoupled sensing for battery monitoring, smart garments, and medical applications.

关键词： thermoelectric composites dual-parameter sensing ofstrain and temperature self-powered sensing thermoelectricarray wireless monitoring

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Two-Degree-of-Freedom Spatial Robust Preview Repetitive Control for Rotational Systems

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2025年

作者： Zhou, Yujian She, Jinhua Shimizu, Haruki Guo, Shijie Wang, Feng He, Yong Kawata, Seiichi Iwasaki, Makoto China Univ Geosci Sch Automat Wuhan 430074 Peoples R China Hubei Key Lab Adv Control & Intelligent Automat Co Wuhan 430074 Peoples R China Minist Educ Engn Res Ctr Intelligent Technol Geoexplorat Wuhan 430074 Peoples R China Tokyo Univ Technol Grad Sch Engn Hachioji Tokyo 1920982 Japan Hebei Univ Technol Engn Res Ctr Hebei Key Lab Robot Sensing & Human Robot Interact Minist Educ Intelligent Rehabil Equipment & Detect Tianjin 300401 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China Nagoya Inst Technol Dept Elect & Mech Engn Nagoya 4668555 Japan

This article presents a two-degree-of-freedom (2DOF) spatial robust preview repetitive control (2DOF-SRPRC) method for a rotational system that ensures robust tracking and disturbance rejection for spatial periodic signals. After explaining the method of building a model in the spatial domain, we present the configuration of a 2DOF-SRPRC system that contains two loops: A loop focuses on exact feedback linearization and the other loop deals with repetitive control issues in the spatial domain. The spatial repetitive control loop has a 2DOF structure that has a feedback controller and a feedforward controller. A repetitive controller contained in this loop ensures the steady-state high-precision reference tracking and disturbance rejection for spatial periodic signals. The feedback controller is designed by optimizing the sensitivity of the system to ensure system robustness against model uncertainties. The feedforward controller is designed to achieve ripple-free deadbeat tracking control. The experimental results of a mechatronic control system demonstrate the validity of the method.

关键词： Time-domain analysis Tracking loops Stability analysis Sensitivity robot sensing systems Feedforward systems Feedback linearization Cutting tools Adaptive control Steady-state Preview control spatial repetitive control two-degree-of-freedom control variable-speed rotational system

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Multifunctional all-nanofiber cloth integrating personal health monitoring and thermal regulation capabilities

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INFOMAT 2025年第1期7卷

作者： Wang, Peng Sun, Guifen Hua, Shuaichuang Yu, Wei Meng, Chuizhou Han, Qing Kim, Jeonghyun Guo, Shijie Shen, Guozhen Li, Yang 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 Univ Jinan Sch Mech Engn Jinan Peoples R China Kwangwoon Univ Dept Elect Convergence Engn Seoul South Korea Beijing Inst Technol Sch Integrated Circuits & Elect Beijing 100081 Peoples R China Univ Jinan Sch Informat Sci & Engn Shandong Prov Key Lab Network Based Intelligent Co Jinan Peoples R China Shandong Univ Sch Microelect Jinan 250101 Peoples R China Fudan Univ State Key Lab Integrated Chips & Syst Shanghai Peoples R China

Frequent heat waves and cold spells pose threats to human survival. Herein, we develop a multifunctional all-nanofiber cloth with physiological signal monitoring and personal thermal management capabilities through facile fiber electrospinning and ink printing techniques. The double-sided fabric mat of a thick carbon nanotube network with high solar absorption on top of a thermoplastic polyurethane nanofiber substrate with high solar reflectivity and mid-infrared emissivity offers a contrary thermal management effect of heating or cooling by opposite wearing mode. The integrated fabric strain and temperature sensors for health status evaluation through monitoring physiological signals of respiration and body temperature. By wearing a T-shirt tailored by the developed electronic cloth, the wearer's skin temperature can be actively regulated with cooling by 5.4 degrees C and warming by 3.0 degrees C in hot and cold environments compared to normal clothing, respectively. This platform can inspire further studies in wearable multifunctional permeable *** We develope a multifunctional all-nanofiber cloth with physiological signal monitoring and personal thermal management capabilities through facile fiber electrospinning and ink printing ***

关键词： electrospun nanofiber passive radiative cooling personal thermal management solar heating strain sensor temperature sensor

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A thermally responsive phase-change hydrogel for skin-mountable multifunctional sensors

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NANO ENERGY 2025年 136卷

作者： Wang, Peng Lv, Yu Duan, Jingle Sun, Guifen Meng, Chuizhou Li, Yang Guo, Shijie Zhang, Ting Univ Jinan Sch Mech Engn Jinan 250022 Peoples R China Hebei Univ Technol Engn Res CtrMinist Educ Intelligent Rehabil Devic State Key Lab Reliabil & Intelligence Elect Equipm Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300401 Peoples R China Univ Jinan Sch Informat Sci & Engn Jinan 250022 Peoples R China Shandong Univ Sch Integrated Circuits Jinan 250101 Peoples R China Chinese Acad Sci Suzhou Inst Nanotech & Nanobion SINANO Key Lab Multifunct Nanomat & Smart Syst i LabNanox Vacuum Interconnected WorkstatKey Lab 398 Ruoshui Rd Suzhou 215123 Peoples R China Univ Sci & Technol China Sch Nanotech & Nanob Hefei 230026 Anhui Peoples R China

Hydrogels have been entensively explored for their intrinsic biocompatible and adhesive properties. However, limitations such as low viscosity, easy dehydration, and difficulty in peeling off the skin. Herein, we develop a hydrogel with a dual crosslinked network of gelatin and polyvinyl alcohol, which shows a unique thermally responsive reversible phase-change property between the flowing fluid state and the viscoelastic gel state. The enhanced hydrogel-based device can be steadily attached to the skin for reliable monitoring or quickly removed by controlling the temperature. Besides, the developed hydrogel exhibits ultra-thin, anti-drying, and self-healing properties. By introducing PEDOT: PSS and graphene dispersion, the hydrogel can be used as skin-mountable electrodes for high-fidelity electrocardiogram signal capture in the long term. By incorporating cobalt nanoporous carbon, a bilayer structure composed of triboelectric and conductive hydrogels is fabricated for noncontact sensing based on hydrogel-triboelectric nanogenerators. This work provides an idea for preparing viscosity-adjustable gels and a promising strategy for developing skin-mountable multifunctional sensors.

关键词： Thermally responsive phase-change Hydrogels Multifunctional sensors Self-adhesion Self-healing

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The temperature field study on the annular heat source model in large surface grinding by cup wheel

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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2017年第9-12期93卷 3261-3273页

作者： Wang, Ruiqin Dai, Shijie Zhang, Huibo Dong, Yafan Hebei Univ Technol Hebei Key Lab Robot Sensing & Human Robot Interac Tianjin 300132 Peoples R China

Most of the current studies focus on the moving heat source model of straight wheel. However, these cannot be applied to calculate the cup wheel grinding temperature field, especially for the grinding processes performed with an adaptive end-effector. Based on the moving heat method and the principle of heat source superposition, the analytical thermal model of annular moving heat source for large surface workpiece is deduced. According to the parameters of the grinding instance, the numerical model is established by the finite element method for comparison and validating in this paper. The comparison results show that the characteristics of temperature distribution predicted by the analytical model and the numerical model agree very well. Two evident peak temperatures in grinding zone appear at both edges at the back of the grinding wheel in the feed direction, and test results with different grinding parameters show the relative errors do not exceed 19%. The feasibility of the analytical model and the numerical model based on different mathematical foundations is mutually validated. In the view of the non-uniform features of temperature distribution, especially the location of the peak temperature values, there are some reasonable explanations and analyses in this paper.

关键词： Surface grinding Moving heat source model Cup wheel Analytical thermal model Finite element method Temperature field

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