Article
Chemistry, Physical
Xiaowen Xu, Yucheng Chen, Pei He, Song Wang, Kai Ling, Longhui Liu, Pengfei Lei, Xianjun Huang, Hu Zhao, Jianyun Cao, Junliang Yang
Summary: The study introduces an ultra-stable and washable strain sensor by embedding a composite film of carbon nanotube (CNT) and Ti3C2Tx MXene into a polydimethylsiloxane (PDMS) matrix, providing skin conformal properties and resistance sensitivity to strain. The sensor demonstrates reliable responses at different frequencies and long-term cycling durability, with superior anti-interference to temperature change and water washing. This composite sensor is successfully applied in monitoring human joint motions and electrocardiogram (ECG) signals, showing great potential for real-time human healthcare monitoring.
Article
Nanoscience & Nanotechnology
Hwajoong Kim, Ammar Shaqeel, Solbi Han, Junseo Kang, Jieun Yun, Mugeun Lee, Seonggyu Lee, Jinho Kim, Seungbeom Noh, Minyoung Choi, Jaehong Lee
Summary: Researchers have developed a stretchable and sensitive fiber strain sensor using harmless materials, which features low electrical resistance, wide strain sensing range, and high stability. By applying the sensor to textiles, various gestures can be monitored in real-time to help users maintain accurate posture.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Ronald E. Booth, Chetna Khanna, Harry M. Schrickx, Salma Siddika, Abdullah Al Shafe, Brendan T. O'Connor
Summary: This study demonstrates a semitransparent shape memory polymer (SMP):silver nanowire (AgNW) composite that can be used for low-temperature actuation in wearable electronics applications. The composite has tunable electrical and optical transparency and can actuate through Joule heating. These results show that SMP:AgNW composites are a promising design approach for wearable electronics.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Composites
Yunpeng Yang, Haijun Wang, Yunyou Hou, Siqi Nan, Yongyue Di, Yu Dai, Fei Li, Jie Zhang
Summary: This paper presents a study on flexible strain sensors based on conductive composites, which are fabricated using screen printing to form different patterns for various strain measurement needs. The sensors demonstrate high sensitivity, good linearity, and excellent stability, repeatability, and dynamic response. The printed strain sensors have potential applications in motion detection, sport and rehab training, and structure health monitoring.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ya-Ru Ding, Chao-Hua Xue, Xiao-Jing Guo, Xue Wang, Shun-Tian Jia, Qiu-Feng An
Summary: A nanocomposite film of TPE and CNTs was fabricated to repel liquids, suitable for wearable electronic devices. The film exhibits good electrical conductivity and superhydrophobicity, showing high sensitivity and stability as a sensor, and can be used in wet conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Sishi Li, Rong Xu, Jiashu Wang, Yanpeng Yang, Qiang Fu, Chunxu Pan
Summary: In this study, a novel high-performance wearable strain sensor is developed using an ultra-stretchable, super-hydrophobic, and high-conductive composite. The sensor exhibits excellent mechanical properties, high sensitivity, stable performance, and easy mass production, showing promising applications in the field of wearable electronic products.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Manufacturing
Mengsi Liu, Yaping Sheng, Chenggang Huang, Yanfen Zhou, Liang Jiang, Mingwei Tian, Shaojuan Chen, Stephen Jerrams, Fenglei Zhou, Jianyong Yu
Summary: In this study, elastomeric fiber based strain sensors incorporating graphene and carbon nanotubes were fabricated via coaxial wet spinning. The solution etched fiber based strain sensors achieved a significant improvement in obtaining a high maximum gauge factor and capability of working over a wide strain range. The strain sensor showed excellent durability and was used to monitor physiological movements with fast and accurate responses.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Review
Chemistry, Multidisciplinary
Ying Yi, Bo Wang, Xingyue Liu, Changping Li
Summary: This article introduces recent advancements in the development of flexible piezoresistive strain sensors based on carbon nanotubes-polymer composites, focusing on their electromechanical properties. Various fabrication approaches and material preparation methods are discussed, as well as the working principle of the sensors. The article highlights the great potential of CNTs-polymer composites for flexible, skin-mountable, and wearable electronics applications, while also addressing possible challenges for future developments.
Article
Physics, Applied
Wenfeng Qin, Junheng Geng, Chuanxi Lin, Yunsheng Xue, Mian Zhong, Yao Zou, Guochun Liu, Ting Zhang
Summary: A wearable flexible strain sensor with a three-dimensional conductive network has been developed for healthcare monitoring and thermal management. It has a low strain detection capacity (0.05% strain) and high sensitivity (gauge factor up to 9472), making it suitable for precise health monitoring of human physiological movements. Additionally, the sensor provides exceptional electric heating and optothermal effect to protect human health in extremely cold environments.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Analytical
Jeeeun Kim, Changsoon Choi
Summary: Motion sensing, particularly in the field of detecting and monitoring mechanical deformation, has attracted significant attention. Fiber-structured mechanical strain sensors with carbon-based materials have emerged as promising alternatives for wearable applications. This study successfully developed multi-modal strain sensors that can monitor multiple deformations.
Article
Chemistry, Multidisciplinary
Shan Wang, Yuanlai Fang, Hao He, Lei Zhang, Chang'an Li, Jianyong Ouyang
Summary: Wearable stretchable dry and self-adhesive strain sensors consist of two layers, with an adhesive layer conforming to skin and a sensing layer sensitive to strain. These sensors accurately monitor various body movements and generate high-quality signals even during skin deformation.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Shu Zhu, Suping Peng, Zhe Qiang, Changhuai Ye, Meifang Zhu
Summary: Researchers have successfully developed carbon nanotube-embedded carbonized melamine foams with excellent performance, including high elasticity, ultrahigh sensitivity, broad pressure detection range, and exceptional cryogenic temperature resistance. The material also exhibits outstanding EMI shielding effectiveness, making it promising for practical applications.
Article
Nanoscience & Nanotechnology
Juan Zhu, Xiaodong Wu, Jasmine Jan, Shixuan Du, James Evans, Ana C. Arias
Summary: Stretchable strain sensors with controlled sensitivity and stretchability are achieved through a novel programable cracking technology based on single-metal material and one-pot evaporation fabrication method, allowing for fine tunability of cracked film morphology. These sensors have a sensitivity gauge factor of over 10,000 and stretchability up to 100%, with frequency response up to 5.2 Hz and stability higher than 1000 cycles, enabling tracking of subtle and drastic mechanical deformations in various applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Ceramics
Zhenlong Li, JiaJia Yin, Yang Yu, Yuan Ji, Yundan Liu, Xiang Qi
Summary: In this study, an economical and eco-friendly strain and sweat sensor was developed using carbon black and natural flour polymer. The sensor, made of green and biodegradable composites, can measure electrical resistance and strain simultaneously and continuously. The sensor's electric response was also investigated under simulated sweat conditions. The CB-dough sensor showed potential for durable surveillance of human activity and real-time feedback of sweat secretion, offering a simple and cost-effective solution for flexible strain sensors in wearable electronics and bio-sensors.
CERAMICS INTERNATIONAL
(2023)
Article
Energy & Fuels
Daedong Park, Young-Kwon Park, Samayanan Selvam, Jin-Heong Yim
Summary: This study demonstrates a supercapacitor-integrated strain sensor system using three types of iron(III)-alkylbenzenesulfonate-based oxidizing agents. The SEBS-rGO-PPy composite films were surface-treated with these oxidizing agents. The A2 iron(III)-(4-ethylbenzenesulfonic acid surface-treated SEBS-rGO-PPy films showed better performance in terms of strain sensor integrate energy storage concerts compared to the other two oxidants. The systems also exhibited good capacity retention of around 95% over 5000 charge-discharge cycles. The biocompatibility studies showed positive results for the three composites. The flexible supercapacitor combined with the sensor system has potential for use in energy storage systems for smart electronic wearable skin-based devices.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Polymer Science
Ruhan Benlikaya, Petr Slobodian, Pavel Riha, Harinarayanan Puliyalil, Uros Cvelbar, Robert Olejnik
Summary: Epoxy composites filled with multiwalled carbon nanotubes treated by inductively coupled ammonia plasma were prepared to enhance the intrinsic properties of the composites. The strengthening effect of the carbon nanotube filler in the epoxy matrix was attributed to the generation of chemical reaction pathways between the treated filler and the epoxy matrix, as shown by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The application of carbon nanotube-filled epoxy composites, such as in microstrip resonant vapor sensors, demonstrates their potential in detecting volatile organic compounds and monitoring environmental temperatures.
EXPRESS POLYMER LETTERS
(2022)
Article
Chemistry, Analytical
Martin Adamek, Jiri Matyas, Anna Adamkova, Jiri Mlcek, Martin Buran, Martina Cernekova, Veronika Sevcikova, Magdalena Zvonkova, Petr Slobodian, Robert Olejnik
Summary: This study focuses on the use of thermodynamic sensors in home baking, brewing, and yogurt production. The results show that thermodynamic sensors can accurately distinguish different phases of the fermentation process and provide important information during the preparation of wort and yogurt with non-traditional additives. The study also introduces the idea of using trivial regulation at home to determine the course of the fermentation process.
Proceedings Paper
Polymer Science
Petr Slobodian, Pavel Riha, Robert Olejnik, Jiri Matyas
Summary: This study evaluates the effect of an embedded electro-conductive multi-walled carbon nanotube (MWCNT) nanopaper in an epoxy matrix on the release of the frozen actuation force and the actuation torque in the carbon nanotube nanopaper/epoxy composite after heating. The presence of the nanopaper improves the recovery of the actuation stress by two times compared to the pure epoxy strip. The enhanced strength of the composite is attributed to the interlocking of the carbon nanotubes with the epoxy. Additionally, the internally heated electro-conductive carbon nanotube nanopaper/epoxy composite not only reduces curing time but also allows the release of adhesive bonds by repeated application of DC current.
MACROMOLECULAR SYMPOSIA
(2022)
Article
Biochemistry & Molecular Biology
Petr Slobodian, Robert Olejnik, Jiri Matyas, Berenika Hausnerova, Pavel Riha, Romana Danova, Dusan Kimmer
Summary: In this study, electroactive PVDF membranes were prepared and their responses to mechanical and electro-mechanical signals were detected. The results showed unique properties and potential applications of PVDF membranes, particularly in terms of their response to electro-mechanical loads.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Polymer Science
Thaiskang Jamatia, Jiri Matyas, Robert Olejnik, Romana Danova, Jaroslav Maloch, David Skoda, Petr Slobodian, Ivo Kuritka
Summary: A wearable and stretchable strain sensor with a gauge factor above 23 was fabricated using a simple and effective technique. The sensor was made from a conductive nanocomposite prepared from SEBS and CB, and showed good flexibility and conductivity. The sensor demonstrated a large piezoresistive effect that was linearly dependent on the applied strain.
Article
Chemistry, Physical
Petr Slobodian, Robert Olejnik, Jiri Matyas, Pavel Riha, Berenika Hausnerova
Summary: This study reports on the unique dual electrification properties of biaxially oriented silica-filled polyethylene terephthalate (BOPET) films, which are widely used as food packaging materials and can effectively convert mechanical energy into electricity. By assembling and testing a hybrid piezoelectric triboelectric nanogenerator energy harvester using this film as an electron source, the performance of the nanogenerator has been significantly improved.
