Review
Materials Science, Multidisciplinary
Yongling Wu, Yulin Ma, Hongyu Zheng, Seeram Ramakrishna
Summary: This article reviews the applications of flexible piezoelectric materials in self-powered devices and micro-sensors, discussing their potential value in medical healthcare and robotics technology, as well as the properties and applications of piezoelectric materials.
MATERIALS & DESIGN
(2021)
Article
Engineering, Multidisciplinary
Fuzheng Zhang, Xiangyue Xu, Qijing Lin, Dan Xian, Kun Yao, Na Zhao, Libo Zhao, Zhuangde Jiang
Summary: With the development of flexible electronic technology, a non-invasive and flexible gait recognition system is proposed in this study. A flexible and distributed pressure sensor is designed and fabricated to collect complex pressure information, and a distributed pressure acquisition circuit and an online gait recognition software are developed to accurately identify different gaits. The system shows great potential and value in fields such as medical diagnosis, health monitoring, gait correction, and artificial intelligence.
Article
Engineering, Electrical & Electronic
Ya-Han Liu, Li-Xiang Chen, Chih-Ying Li, Fu-Sung Lin, Hsin-Yi Su, Chi-Ting Tsai, Li-Wen Wang, Yeong-Her Wang, Chih-Hsien Huang
Summary: A wearable transparent ultrasonic transducer was developed and applied in a PAI system with excellent performance, demonstrating potential for large-field PAI application in wearable health devices. The acoustic sensor, with a sandwich structure, exhibited a 6.7 MHz center frequency, an 86.3% -3 dB fractional bandwidth, and a 20 x 20 x 36 mm(3) volumetric imaging field.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Physical
Nadeem Tariq Beigh, Faizan Tariq Beigh, Dhiman Mallick
Summary: This paper presents the development of a flexible hybrid sensor for gait monitoring and grip strength assessment, achieving high accuracy in feature extraction through machine learning algorithms. The sensor exhibits high sensitivity, low cross talk, and a large pressure range, with the advantages of fast and cost-effective design flow and ease of operation.
Article
Engineering, Electrical & Electronic
Sepide Taleb, Miguel Badillo, Francisco J. Flores-Ruiz, Monica Acuautla
Summary: This work presents a simple process for fabricating piezoelectric BaTiO3/P(VDFTrFE) composites and their application as wearable piezoelectric sensors. Addition of synthesized tetragonal BaTiO3 particles (diameter of 200 nm) improved the mechanical and piezoelectric properties of the P(VDF-TrFE) matrix. The final piezoelectric sensor showed improved performance due to stress distribution modification, viscosity reduction, and mechanical reinforcement of the composite films by BaTiO3. The composite also exhibited higher polarization and dielectric constant values compared to pure P(VDF-TrFE), with enhanced ferroelectric and switching behavior at lower electric fields. The composite sensor demonstrated higher voltage coefficient and improved output voltage, power, and sensitivity for finger joint movement detection, without the need for amplification or post-processing.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Jing Li, Guoyun Zhou, Yan Hong, Wei He, Shouxu Wang, Yuanming Chen, Chong Wang, Yao Tang, Yukai Sun, Yongkang Zhu
Summary: In this study, a highly sensitive piezoelectric sensor was designed, which can stably record human joint movement and breathing, showing great potential for online movement monitoring of personal health.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Robotics
Jiajie Guo, Chuxuan Guo, Jialei Zhou, Kui Duan, Qining Wang
Summary: This article presents a method to capture mechanical deformations of muscle contraction using wearable flexible sensors. The method is validated through model calibration and experimental testing, and it demonstrates high accuracy and stability in measuring muscle strain. The sensing model is calibrated using ultrasound medical imaging, and the effectiveness and accuracy of the method are confirmed through gait pattern identification experiments. This non-invasive measurement method has great potential for muscle deformation monitoring and motion pattern recognition.
Review
Materials Science, Ceramics
Mao Aiqin, Lu Wenyu, Jia Yanggang, Wang Ranran, Sun Jing
Summary: Wearable instruments are functional devices that can be worn on the human body to sense, transmit, and process body or environmental information in real time, showing great potential in medical health, artificial intelligence, sports, and entertainment. Flexible mechanical sensors based on the piezoelectric effect have gained attention due to their wide sensing frequency, fast response, good linearity, and self-power supply. However, the use of brittle ceramics and crystalline materials as traditional piezoelectric materials limits their application in flexible devices.
JOURNAL OF INORGANIC MATERIALS
(2023)
Article
Computer Science, Information Systems
Soobin Lee, Seungjae Lee, Eunkyoung Park, Jongshill Lee, In Young Kim
Summary: With the rapid development of networking and computing technology, the security of personal information stored on smart devices has become increasingly important. This study proposes a sensor compensation algorithm and new 2D cyclogram features to improve user authentication performance in gait recognition. Experimental results show the proposed algorithm can transform unstable sensor signals into stable anatomical coordinates and effectively discriminate individual gait patterns using 2D cyclogram features, achieving high accuracy rates for gait authentication.
Article
Chemistry, Physical
Ziying Wang, Miaomiao Bu, Kunhao Xiu, Jingyao Sun, Ning Hu, Libin Zhao, Lingxiao Gao, Fanzhong Kong, Hao Zhu, Jungil Song, Denvid Lau
Summary: Intelligent gait recognition system is of great significance in identity recognition, physical training, and medical diagnostics. A self-powered strain sensor and a wearable in-shoe monitoring system are reported to accurately monitor and recognize human gait, showing great potential for various medical applications.
Article
Chemistry, Analytical
Zhiqiang Song, Bozhi Wang, Zhuo Zhang, Yirong Yu, Dabin Lin
Summary: The elderly are prone to osteoporosis and require regular bone status checks. This study presents a high-performance flexible ultrasonic bone testing system, which utilizes axial transmission technology and a rare-earth-element-doped PMN-PZT piezoelectric ceramic to achieve high piezoelectric coefficient and electromechanical coupling factors. The flexible hardware circuit enables wireless transmission and real-time display of bone condition.
Article
Chemistry, Physical
Ziwu Song, Jihong Yin, Zihan Wang, Chengyue Lu, Ze Yang, Zihao Zhao, Zenan Lin, Jiyu Wang, Changsheng Wu, Jia Cheng, Yuan Dai, Yunlong Zi, Shao-Lun Huang, Xinlei Chen, Jian Song, Gang Li, Wenbo Ding
Summary: MTSensing system is a wireless system integrating tactile sensing technology, which can simultaneously recognize materials and textures through a single flexible triboelectric sensor, achieving high accuracy prediction through deep learning models.
Article
Chemistry, Physical
Yipu Du, Ruoxing Wang, Minxiang Zeng, Shujia Xu, Mortaza Saeidi-Javash, Wenzhuo Wu, Yanliang Zhang
Summary: This study presents a novel wearable piezoelectric device fabricated using a unique material and process, featuring excellent performance and stretchability without the need for sintering and poling processing. The device can be used for gesture recognition and heartbeat monitoring, offering great potential for integration with a wide range of printed electronics and wearable devices.
Article
Nanoscience & Nanotechnology
Wentuo Yang, Mengying Xie, Xiaoshuang Zhang, Xueyou Sun, Cheng Zhou, Ye Chang, Hainan Zhang, Xuexin Duan
Summary: A multifunctional soft robotic finger with an embedded nanoscale sensor was developed in this study to aid in material recognition through tactile perception, achieving high accuracy through the combination of tactile information and artificial neural networks. The research demonstrates the potential application of this multifunctional soft robotic finger in material recognition.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Z. Zhao, Y. Dai, S. X. Dou, J. Liang
Summary: Flexible piezoelectric nanogenerators have shown great potential as sensors for human health monitoring and harvesters for biomechanical energy. This progress report presents the latest developments in this technology, including the internal mechanism of piezoelectricity and enhancement in output performance. The application of this technology in health monitoring and biomechanical energy harvesting is discussed.
MATERIALS TODAY ENERGY
(2021)
