Review
Chemistry, Multidisciplinary
Min Su, Pei Li, Xueqin Liu, Dapeng Wei, Jun Yang
Summary: This paper provides a comprehensive review of recent developments in textile-based flexible capacitive pressure sensors, including sandwich structures, yarn structures, and in-plane structures. It discusses the influences of different device structures on performance and summarizes the applications of textile-based sensors in human wearable devices, robotic sensing, and human-machine interaction. The paper also highlights evolutionary trends, future directions, and challenges.
Article
Polymer Science
Yi Zhou, Rebecca Stewart
Summary: Flexible strain sensors using textiles as substrates have garnered attention for their application in wearable monitoring. This study proposes a graphene-based TPU/textile composite sensor, which is produced using small-scale manufacturing techniques. The mechanical, electrical, and sensing properties of the sensor were explored, and tests were conducted to evaluate its sensitivity, reliability, and durability. The composite sensor exhibited high sensitivity, wide sensing range, reliability, and stability, making it suitable for various wearable devices.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Marc Martinez-Estrada, Heura Ventura, Ignacio Gil, Raul Fernandez-Garcia
Summary: In this paper, a fully integrated textile capacitive woven sensor for moisture measurement and presence detection is presented. The sensor demonstrates excellent response to moisture and presence, with improved repeatability compared to previous embroidered sensors. The adaptation of the weaving process opens the door to commercial production of this sensor.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Jagan Singh Meena, Su Bin Choi, Tran Duc Khanh, Hyun Sik Shin, Jun Sang Choi, Jinho Joo, Jong-Woong Kim
Summary: Mechanically stretchable capacitive sensors have great potential for continuous health-monitoring. A textile-based capacitive sensor was developed using titanium carbide-based MXene (Ti3C2Tx) to fabricate conductive textiles and a composite film of polystyrene (PS) fibers and ecoflex silicone as a dielectric layer. The sensor showed excellent performance in terms of sensitivity, response time, and stability, and was able to detect human motion accurately.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Yan Zhong, Fucheng Gu, Longgang Wu, Jiaqi Wang, Shengping Dai, Hao Zhu, Guanggui Cheng, Jianning Ding
Summary: This study developed flexible capacitive pressure sensors based on high concentration carbon nanotube-doped porous electrode and ultrathin porous polyvinylidene difluoride dielectric layer. The sensors exhibit high sensitivity over a wide range, offering potential applications in wearable electronics. The research also explored the effects of various parameters on the capacitance performance and achieved a fundamental understanding of the sensing mechanism through analytical models and finite-element analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Sadia Yazdani, Mansoor Khan, Arooba Shahzad, Luqman Ali Shah, Daixin Ye
Summary: In this study, stretchable and conductive hydrogels were fabricated by interlinking lauryl methacrylate with acrylamide and sodium alginate, resulting in enhanced mechanical properties. The hydrogel strain sensor exhibited a wide range of strain measurement, excellent stability, and quick response time. Therefore, these hydrogel-based strain sensors could have potential applications in future wearable electronic devices and human movement monitoring.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Composites
Sirui Tan, Junsheng Wang, Wanhui Jin, Qian Zhang, Zhong Zhao, Daiqi Li, Deshan Cheng, Shuguang Bi, Jianhua Ran, Guangming Cai, Xin Wang
Summary: This article presents a scalable and simple method for fabricating liquid metal (LM)/carbon nanotubes (CNTs) @Ecoflex (LCEF) coaxial conductive filaments. The electro-mechanical response of the filaments was investigated, showing their capability for monitoring both large and subtle human motions. Additionally, the LCEF fabrics demonstrated efficient electrothermal response, functioning as large-area flexible heaters. This work contributes to the scalable fabrication of flexible strain sensors and electrothermal devices, paving the way for the development of multifunctional wearable electronic devices.
COMPOSITES COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Huihui Zheng, Hongwei Zhou, Zhao Wang, Shuman Zhang, Hongli Zhang
Summary: In this work, self-healing polyampholyte hydrogels are developed and explored in constructing wearable mechanosensors, including resistive strain sensors and capacitive pressure sensors. The resulting hydrogels exhibit outstanding self-healing ability, transparency, ionic conductivity, and stretchability. The resistive strain sensors show a gauge factor of 2.9 over a strain range of 0-350% and a low response time of 250 ms, while the capacitive pressure sensors achieve a gauge factor of 2.17 kPa(-1) and a sensing range of 0-7.35 kPa, with high cycling stability.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Instruments & Instrumentation
Rongliang Zheng, Youyuan Wang, Zhanxi Zhang, Yanfang Zhang, Jinzhan Liu
Summary: Researchers developed a flexible capacitive pressure sensor based on reduced graphene oxide cotton fiber using a simple and low-cost preparation process. The environmentally friendly sensor showed excellent performance and a wide range of applications.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Physical
Mengnan Qu, Qinghua Liu, Fan Shi, Yanqing Lv, Hui Liu, Leihuan Mu, Xiaofeng Liu, Jinmei He
Summary: In this study, a PDMS/Ag-CNTs-PVDF/PU sponge sensor with a 3D conductive network and superhydrophobic structure was successfully fabricated. The sensor exhibited a wide strain detection range, superior conductive sensitivity, fast and stable response time, and excellent resistance to wear and corrosion.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Multidisciplinary Sciences
Ziqi Qu, Zhechen Zhu, Yulong Liu, Mengxia Yu, Terry Tao Ye
Summary: Conductive yarns have shown potential as a replacement for metallic wires in e-Textile devices. However, the parasitic capacitance induced by their micro-structure is not fully understood. This study proposes a model to analyze and quantify the parasitic elements of conductive yarns in air-core helical inductors. The results show that the parasitic capacitance of commercial conductive yarns ranges from 1 fF/cm to 3 fF/cm depending on the yarn's microstructure, providing valuable insights for the design and use of conductive yarns in e-textile devices.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Multidisciplinary
Na Ni
Summary: This study proposed flexible and highly sensitive ionic skins for monitoring finger joint motion, based on a multilayer dielectric structure. Increasing the number of dielectric layers was found to improve sensitivity but suppress linearity. The proposed ionic skins provided higher sensitivity and linearity compared to other flexible sensors.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Xinlong Sun, Jun-Heng Fu, Chao Teng, MingKuan Zhang, TianYing Liu, MingHui Guo, Peng Qin, Fei Zhan, Yan Ren, Hongbin Zhao, Lei Wang, Jing Liu
Summary: Electronic textiles have great potential in health monitoring, energy harvesting, temperature regulation, and human-computer interactions. However, current electronic textiles still struggle to achieve both superior conductivity and water repellency. This study proposes a simple and efficient approach to integrate a hierarchical elastic e-textile by electroless silver plating. The resulting textile exhibits exceptional superhydrophobic performance, high conductivity, and good waterproofing, making it suitable for electromagnetic interference shielding and wearable strain sensing.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Chunqing Yang, Weiwei Wang, Dongzhi Zhang, Chen Du, Hao Zhang, Hui Xia
Summary: A highly sensitive melamine sponge pressure sensor based on MXene/PANI was developed, which exhibited fast response time, low detection limit, good repeatability, and stability. It can be applied for wearable sensing and pressure distribution detection of objects.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wanhayoi Geng, Tyler J. Cuthbert, Carlo Menon
Summary: Wearable devices with soft strain sensors can provide valuable information for users in rehabilitation or improving athletic performance, correlating strain with complex metrics like joint angle motion tracking. The capacitive filament produced through dip-coating achieved high performance with simple materials and fabrication processes. This design of the sensor resulted in high baseline capacitance, low noise, good mechanical response, and highly stable signals without requiring expensive components.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Chemistry, Analytical
Jianfeng Wu, Yu Wang, Jianqing Li, Aiguo Song
Review
Engineering, Electrical & Electronic
Jian-Feng Wu
IEEE SENSORS JOURNAL
(2017)
Article
Engineering, Electrical & Electronic
Jian-Feng Wu, Bin-Bin Liu, Feng Wang, Chao Qiu, Xin-Gang Zhao, Qi Wang, Shang-Shang He
IEEE SENSORS JOURNAL
(2019)
Article
Engineering, Electrical & Electronic
Jian-Feng Wu, Rui-Heng Wang, Xiang-Yu Ye, Cong Hu, Feng Wang
Summary: Researchers have developed a novel linear readout circuit to address the non-linear relationship between output voltage and resistance in the sensor array. Experimental results showed that the circuit can read two elements simultaneously with linear output and its performance can be quickly evaluated using mathematical expressions of equivalent resistance.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Jian-Feng Wu, Ping Yang, Heng-Yu Hu, Cong Hu, Bin-Bin Liu
Summary: In this study, a sensitive unit with replaceable bilayer structure (SU-RBS) was proposed for 2-D resistive sensor arrays. This method allows for fast replacement of damaged sensitive units while maintaining good performance of the sensor array.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Analytical
Huanqian Zhang, Jee Chin Teoh, Jianfeng Wu, Longteng Yu, Chwee Teck Lim
Summary: One advantage of a resistive sensor array (RSA) with shared rows and shared columns is the reduced number of wires, which can lessen the complexity and burden on wearable electronic systems. However, the drawback is the crosstalk current effect between adjacent elements, which leads to high measurement error. This study introduces a new circuit design called the dynamic zero current method (DZCM) to decrease the measurement error further.