SYNTHETIC METALS
·
2025
·
IF 4.6
Yu Lin,Gen Li,Juan Teng,Haibo Wang,Ximei Liu
As a crucial component of flexible electronic devices, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)-based hydrogels for strain sensors have garnered extensive attention for their potential in the field of wearable sensors due to their inherent conductivity and flexibility. However, challenges such as poor mechanical strength, limited sensitivity, and poor durability have hindered the widespread application of PEDOT:PSS hydrogels in high-performance strain sensors. In this study, we develop a novel PEDOT:PSS-P(HEMA-co-AA) hydrogel that addresses common limitations in hydrogel applications, demonstrating remarkable stretchability, low hysteresis, and reliable conductivity. The hydrogel is synthesized using a semi-interpenetrating polymer network (SIPN) strategy, combining the linear conducting polymer PEDOT:PSS with a chemically cross-linked network based on 2-hydroxyethyl methacrylate (HEMA) and acrylic acid (AA). This hybrid structure notably contributes to the hydrogel's mechanical properties, achieving a stretchability of 195 %, while maintaining a rapid response time of 0.20 seconds and exceptional cyclic stability over 1000 cycles under 100 % strain. Moreover, the hydrogel demonstrates promising strain-sensing capabilities, positioning it as a strong candidate for future applications in wearable electronics and flexible sensors. The adoption of the SIPN strategy, along with the synergistic combination of PEDOT:PSS and P(HEMA-co-AA), paves a new pathway for enhancing the mechanical performance and sensing properties of hydrogels in strain-sensing technologies.
研究领域:
材料科学
·
柔性电子
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2021
·Vol. 12
·期 3
·252
·
IF 2.891
Feiyu Fang,Han Wang,Huaquan Wang,Xiaofei Gu,Jun Zeng,Zixu Wang,Xindu Chen,Xin Chen,Meiyun Chen
In this work, a novel flexible electrically resistive-type MXene/Thermoplastic polyurethanes(TPU) based strain sensors was developed by a composite process of electrospinning (ES) and electrostatic spray deposition (ESD). Compared with other deposition processes, the sensing layer prepared by ESD has better adhesion to the ES TPU nanofiber membrane and is not easy to crack during the stretching process, thereby greatly improving the working range of the strain sensor. Furthermore, we obtained the sandwich structure easily by ES on the surface of the sensing layer again. This will help make the stress distribution more uniform during the stretching process and further increase the strain sensing range. The ESD-ES strain sensors were attached on skin to monitor various human motions. The results demonstrate that our ESD-ES strain sensors have wide application prospects in smart wearable device.Keywords:strain sensor;electrospinning;electrostatic spray deposition;MXene
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Yifan Zhang,Wenlong Pan,Yuliao Dong,Jianning Ding,Lin Xu
Conductive hydrogels have emerged as significant materials within the domain of soft electronics, attributed to their remarkable stretchability, high sensitivity, and rapid response characteristics. In this study, we successfully developed a novel conductive hydrogel, named NAM, which integrates MXene nanosheets into a P(NIPAm-AAc) network to create a dynamic crosslinked structure. This NAM hydrogel exhibits exceptional mechanical properties, including a tensile strength exceeding 1400% and the ability to adhere to objects of different materials. It also demonstrates satisfactory electrical conductivity (0.233 S/m) and high sensitivity (GF=3.384), with rapid response and recovery time of 60 ms. The NAM hydrogel sensors are capable of detecting a wide range of strains (0-800%) and maintaining excellent repeatability in cyclic loading-unloading. They can effectively monitor subtle facial micro-expressions, laryngeal vocalizations, and human motion data, and can be integrated into soft robotic systems for enhanced functionality. The findings suggest significant potential applications for the NAM hydrogel in soft robotics, flexible electronic skin, smart health monitoring, and biomedicine, highlighting its multifunctional capabilities in the realm of soft electronics.
研究领域:
材料科学
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生物医学工程
·
软体机器人
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 17
·175502
·
IF 3.404
Hui Pan,Zhixin Chen,Shenmin Zhu,Chun Jiang,Di Zhang
Nanoparticles, having the ability to self-assemble into an ordered structure in their suspensions, analogous to liquid crystals, have attracted extensive attention. Herein, we report a new type of colloidal gel with an ordered crystal structure assembled from 1D and 2D nanoparticles. The material has high elasticity and, more interestingly, it shows significant photoelasticity. Its refractive index can be tuned under external stress and exhibits an ultra-wide dynamic range (Δn) of the order of 10−2. Due to the large Δn, the material shows an extremely high strain sensibility of 720 nm/ε, an order of magnitude higher than the reported ones.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Lisong Hu,Yitong Xie,Shishuai Gao,Xiaoyu Shi,Chenhuan Lai,Daihui Zhang,Chuanwei Lu,Yi Liu,Lei Du,Xuezhi Fang,Feng Xu,Chunpeng Wang,Fuxiang Chu
Stretchable and tough polysaccharide-based functional hydrogels have gained popularity for various applications. However, it still remains a great challenge to simultaneously own satisfactory stretchability and toughness, particularly when incorporating renewable xylan to offer sustainability. Herein, we describe a novel stretchable and tough xylan-based conductive hydrogel utilizing the natural feature of rosin derivative. The effect of different compositions on the mechanical properties and the physicochemical properties of corresponding xylan-based hydrogels were systematically investigated. Owing to the multiple non-covalent interactions among different components to dissipate energies and the strain-induced orientation of rosin derivative during the stretching, the highest tensile strength , strain, and toughness of xylan-based hydrogels could reach 0.34 MPa, 2098.4 %, and 3.79 ± 0.95 MJ/m 3 , respectively. Furthermore, by incorporating MXene as the conductive fillers, the strength and toughness of hydrogels were further enhanced to 0.51 MPa and 5.95 ± 1.19 MJ/m 3 . Finally, the synthesized xylan-based hydrogels were able to serve as a reliable and sensitive strain sensor to monitor the movements of human beings. This study provides new insights to develop stretchable and tough conductive xylan-based hydrogel, especially utilizing the natural feature of bio-based resources.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xiaoyu Shi,Kai Wang,Shishuai Gao,Daihui Zhang,Chenhuan Lai,Can Jin,Mi Li,Chunpeng Wang,Qiang Yong,Fuxiang Chu
As lignin is one of the most abundant renewable resources, utilization to fabricate functional hydrogels has gained increasing attention. However, the heterogeneous structure and the few available functional groups of lignin limited its applications. Herein, we presented a simple strategy to synthesize gallic acid (GA)-modified lignin as a key component to prepare conductive hydrogels. The addition of GA during the organic solvent pretreatment of poplar changed the structure of lignin and increased the total content of phenolic hydroxyl groups from 3.20 to 3.89 mmol/g (EOL-G30). Moreover, the enzymatic hydrolysis of pretreated poplar was enhanced from 49.1 to 55.2% (OP-G30) at a low enzyme loading of 5 FPU/g. When using GA-modified lignin to prepare hydrogels, the resulting hydrogel exhibited excellent self-adhesion to various substrates and demonstrated effective free radical scavenging capabilities. When incorporating sodium chloride (NaCl) as conductive ions, the hydrogels exhibit reliable strain-sensing capability. Moreover, they also displayed robust functionality in a low-temperature environment (−20 °C). This study has presented valuable insights to realize in situ modification of lignin and fabricate lignin-based functional materials, offering new perspectives for the biorefinery industry.
研究领域:
材料科学
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生物化学
·
可再生资源工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 12
·4235-4242
·
IF 6.4
Linping Wang,Ben-Lin Hu,Fengyuan Zhang,Yinxia Zhang,Junming Li,Tianhua Xu,Run-Wei Li
Electrodes are essential components in electronic devices. One challenge in developing wearable electronics involves obtaining elastic electrodes with high mechanical and electrical stability. Poor mechanical and electrical stability in stretchable polymer electrodes often stems from instability of the nodes in the polymer network based on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), which has typically been used in elastic electrodes. In this study, soft and long chains were covalently crosslinked to the PSS chains directly via esterification between sulfonic acid and epoxy groups, and is used as the first effective example of the direct covalent-crosslinking of PEDOT:PSS to enhance the mechanical and electrical stability of elastic electrodes. By varying the crosslinking temperature and long chain ratio, the optimal PEDOT:PSS films showed a conductivity of 13 100 S m−1 and a stretchability of up to 50%. The R/R0 values of these films up to 50% strain were lower than 1.5. Elastic capacitive strain sensors using these crosslinked PEDOT:PSS films as electrodes showed a high linearity of up to 50% strain and excellent stability during cyclic testing. Our study provides a valid solution for enhancing the mechanical and electrical stability of elastic electrodes, indicating the potential of stable elastic PEDOT:PSS electrodes in thin film devices for electronic skin applications.
研究领域:
材料科学
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电子工程
·
可穿戴技术
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·Vol. 225
·期 22
·2400224
·
IF 2.5
Gen Li,Rongtai Wan,Shuhan Liu,Lina Wang,Mangmang Yu,Jiang Zhong,Hanjun Yang,Ximei Liu,Baoyang Lu
Strain sensors from conducting polymer hydrogel have been widely employed in various wearable devices, electronic skins, and biomedical applications. These sensors provide outstanding flexibility and high sensitivity by integrating conducting polymer with hydrogels, making them particularly suitable for monitoring human motion and physiological signals like heart rate or muscle activity. Despite their extensive application potential, conducting polymer hydrogel face several technical challenges in practical use, including poor mechanical properties, lack of long-term stability, and difficulty in customizable design. This work introduces a method for fabricating a multipedal strain sensor using poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)/polyvinyl alcohol (PVA) dimethyl sulfoxide (DMSO)hydrogels through screen printing and demonstrates its application in human motion monitoring. The multipedal strain sensor demonstrates a low Young's modulus (200 kPa), high stretchability (400%), and excellent mechanical cyclic stability (3000 cycles). Furthermore, this strain sensor is further applied to detect human movements such as chewing, smiling, fist clenching, arm bending, and carotid pulse monitoring. Comparative analysis between the multipedal-designed sensor and the non-designed sensor highlights the enhanced sensing capabilities of the multipedal sensor. The design of this multipedal sensor holds the potential to broaden the design concepts for strain sensors and offers new insights for wearable devices and electronic skins.
研究领域:
生物医学工程
·
材料科学
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Huhu Zhao,Shuang Yan,Xianghu Jin,Pengying Niu,Gongzheng Zhang,Yukai Wu,Huanjun Li
Flexible conductive elastomers with excellent mechanical properties and body-temperature self-healing are highly desirable for wearable electronics. However, it is still a challenge to develop such elastomers because mechanical strength and healing efficiency are contradictory and are difficult to realize the concurrent optimization. Herein, we design stretchable conductive composites by combining tough self-healable elastomeric matrix and in-situ formed polypyrrole network. The elastomeric matrix, fabricated by copolymerization of N-isopropylacrylamide and 2-methoxyethylacrylate, displays superior mechanical strength (8.2 MPa) and high body-temperature healing efficiency (94%), enabled by combination of the dynamic hydrogen bonding and microphase separation structures from freezing-thawing treatment. The resultant conductive elastomers exhibit excellent strength of 7.4 MPa, high stretchability of 410%, good electrical conductivity of 12.5 S/m and over 70% body-temperature healing efficiency. Moreover, it is revealed that the conductive elastomers could be used as strain sensors due to high sensitivity of stretchability. The tough self-healing conductive elastomers may find potential applications in stretchable electronics and soft robotics
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Yi Wang,Guanghui Gao,Xiuyan Ren
Hydrogels flexible wearable sensors have gained widespread attention. However, there was a great challenge to prepare the flexible hydrogel sensor with rapid response, wide strain monitoring ranges, great sensitivity and self-adhesion. Therefore, the greatly sensitive and rapidly responsive strain sensor with wide monitoring range and self-adhesion was prepared by introducing sodium caseinate (SC) and reduced graphene oxide (rGO) into the polyacrylamide hydrogel due to ions and electrons provide two different ways of conducting electricity. Casein not only imparted excellent adhesion to the hydrogel, but also provided a good ionic conductive pathway. In addition, the introduction of rGO could offer an electronic pathway. Therefore, the obtained hydrogel exhibited excellent rapid response (190 ms), high sensitivity (Gauge factor, GF = 13.14) and wide strain monitoring range (0.1–1100%). As a result, SC/rGO/PAAm hydrogels could detect sensitive locomotor signals (for example speaking) and large-scale mankind movements for example knee bending). It was believed that the ion and electron conduction would provide a new mechanism to preparing greatly sensitive hydrogel strain sensor.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Haofei Qie,Zengqiang Wang,Jiayuan Ren,Shaoyu Lü,Mingzhu Liu
Developing shape memory hydrogel strain sensors with both high mechanical property and stable electrical performance is a challenge. Here, a hydrogel based on gelatin was reported as a strain sensor. The hydrogel was developed by gelatin grafted polypyrrole , polyacrylamide and tannic acid . The gelatin moieties were exploited to form a water-soluble conductive polymer, endowing the hydrogel with shape memory behavior and addressing the challenge of low conductivity induced by structural inhomogeneity and aggregation of conductive nanomaterials . Tannic acid was introduced to provide hydrogen-bonding and π−π stacking interactions to promote hydrogel mechanical properties . The hydrogel achieved a maximum tensile strength of 1.44 ± 0.11 MPa, maximum toughness of 2581 ± 453 kJ/m 3 and maximum conductivity of 0.58 ± 0.10 S/m. Results demonstrated that the hydrogel showed shape memory property and can respond to and discern different motions. This achievement offers an opportunity to facilitate significant shape memory conductive hydrogel strain sensor with both high mechanical property and stable electrical performance.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Yitong Xie,Shishuai Gao,Junyu Jian,Xiaoyu Shi,Chenhuan Lai,Chunpeng Wang,Feng Xu,Fuxiang Chu,Daihui Zhang
Conductive hydrogels have attracted increasing attention for applications in wearable and flexible strain sensors. However, owing to their relatively weak strength, poor elasticity, and lack of anti-freezing ability, their applications have been limited. Herein, we present a skin-mimicking strategy to fabricate cellulose-enhanced, strong, elastic, highly conductive, and anti-freezing hydrogels. Self-assembly of cellulose to fabricate a cellulose skeleton is essential for realizing a skin-mimicking design. Furthermore, two methods, in situ polymerization and solvent replacement, were compared and investigated to incorporate conductive and anti-freezing components into hydrogels. Consequently, when the same ratio of glycerol and lithium chloride was used, the anti-freezing hydrogels prepared by in situ polymerization showed relatively higher strength (1.0 MPa), while the solvent-replaced hydrogels exhibited higher elastic recovery properties (94.6 %) and conductivity (4.5 S/m). In addition, their potential as strain sensors for monitoring human behavior was analyzed. Both hydrogels produced reliable signals and exhibited high sensitivity. This study provides a new horizon for the fabrication of strain sensors that can be applied in various environments.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）