JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 17
·14118-14127
·
IF 2.22
Liu Ping,Chen Minggan,Xiong Canguang,Cao Xiuhua,Wang Hui
High sensitivity is the major desired requirements of strain sensors for wearable electronics applications, especially in health and medical monitoring. A bending sensor attach tightly to skin remains a hot topic considering wide response range and high sensitivity. Herein, a highly sensitive strain sensor based on graphene/carboxymethyl cellulose (GE/CMC) composite film is fabricated through vacuum filtration and chemical reduction. CE/CMC films present an ordered multi-layer structure, which is helpful for signal sensitivity. Owing to the super flexibility of carboxymethyl and the excellent electrical and mechanical properties of GE, the free-standing GE/CMC film reveals high conductivity at 1321.9 S m −1 , good response performance at low voltage driving of 1 mV. The bending signal of GE/CMC film was stable, when applying 0–90° forward bending strain. Its sensitivity reaches at 0.83 rad −1 , and response time of 90° forward bending strain is less than 190 ms, with a regularly stable bending signal response in 100 cycles bending testing. With such outstanding performances, the GE/CMC film can be expected to be applied in motion signal detection.
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2015
·
IF 3.071
Zhigang Xue,Yongjun Tang,Xiaoling Duan,Yunsheng Ye,Xiaolin Xie,Xingping Zhou
The cost-effective and high-performance ionic polymer–metal composites (IPMC) were designed and prepared from ion-exchange membranes based on sulfonated poly(ether ether sulfone) (SPEES) with different degrees of sulfonation (DS). The precursor of SPEES, namely PEES, is commercially available and industrial grade. Moreover, the PEES can be transformed easily into ion-conductive SPEES through a simple sulfonation reaction. The ion exchange capacity (IEC) and water uptake (WU) of SPEES membranes increase with increasing their DS, and the proton conductivities of these hydrated SPEES membranes are subsequently enhanced. Compared with the commercial Nafion ion-exchange membrane, the SPEES membranes have higher IEC and WU. The IPMC actuators made of the SPEES membranes show the large bending strain and fast response under electric stimulation. The SPEES membrane with the highest DS (SPEES4) shows the best performance of IPMC actuators. The electromechanical behaviors of these IPMC actuators indicate that the SPEES is a candidate to substitute Nafion.
研究领域:
材料科学
·
高分子化学
·
仿生工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 17
·5621-5627
·
IF 7.393
Huihong Jiang,Boyu Peng,Shuang Liu,Jie Ren,Weitao Yang,Chengce Lin,Ruihan Wu,Hongzheng Chen,Hanying Li
Organic single crystals, with regular molecular packing and fewer structural defects, have presented record-high carrier mobility of various organic semiconductor materials, making them ideal charge-transport media for flexible devices. However, compared with organic amorphous/polycrystalline films, organic single crystals are more fragile. To utilize high-quality organic single crystals in flexible devices, the diverse response (cracks, delamination) of single crystals to bending strain should be meticulously explored, as well as the associated effects on transistor performance. Here, flexible organic field-effect transistors (OFETs) fabricated from aligned, ribbon-like single crystals of bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) are studied in different bending scenarios. With increasing tensile or compressive bending strain, the single crystal will crack or delaminate. The cracks are prone to appear faceted with a direction along the crystal ribbons, parallel to the crystallographic planes of the dense molecular packing. While interestingly, devices exhibit negligible decline in mobility even if the crystal surface has obvious cracks, which is ascribed to the intact charge transport channel. Moreover, devices show superior stability after 1000 consecutive bending cycles or keeping bent for 20 days. As such, this work confirms the potential of organic single crystals being applied to flexible transistor devices with good stability as well as high performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2014
·Vol. 5
·期 20
·6097-6107
·
IF 5.368
Yongjun Tang,Chao Chen,Yun Sheng Ye,Zhigang Xue,Xingping Zhou,Xiaolin Xie
The sulfonated polyphenylsulfone (SPPSU) membranes with different degrees of sulfonation (DS) were prepared for fabricating low-cost and high-performance ionic polymer–metal composite (IPMC) actuators. The properties of SPPSU ion exchange membranes and the electromechanical performance of resulting SPPSU actuators can be manipulated by controlling their DS. As the DS of SPPSU membranes increases, their ion exchange capacity (IEC), water uptake and ion conductivity increase accordingly, whereas the hydrated mechanical properties (strength and modulus) decrease. The SPPSU membrane with the highest DS (SPPSU4) shows much higher IEC and water uptake, and slightly lower ion conductivity than those of the traditional Nafion membrane. Among the prepared IPMC actuators, the SPPSU4 actuator performs the best in the bending deformation under the electric stimulus. The maximum bending strain (MBS) of the SPPSU4 actuator is comparable to that of the Nafion actuator coupled with several times faster bending response at 3 V DC voltage. Compared with the Nafion system, the SPPSU4 actuator increases approximately twice at MBS under a sinusoidal voltage of 3 V at 1 Hz. This greatly enhanced actuation performance indicates that the SPPSU is a candidate to substitute Nafion in the field of IPMC actuators.
研究领域:
材料科学
·
仿生工程
✓ 已验证
DOI
高影响因子
Smart Materials and Structures
·
2015
·Vol. 24
·期 6
·065026
·
IF 2.502
Qingsong He,Min Yu,Xu Yang,Kwang Jin Kim,Zhendong Dai
A newly developed ionic electro-active actuator composed of an ionic electrolyte layer sandwiched between two graphene film layers was investigated. Scanning electronic microscopy observation and x-ray diffraction analysis showed that the graphene sheets in the film stacked in a nearly face-to-face fashion but did not restack back to graphite, and the resulting graphene film with low sheet resistance (10 Ω sq−1) adheres well to the electrolyte membrane. Contact angle measurement showed the surface energy (37.98 mJ m−2) of the ionic electrolyte polymer is 2.67 times higher than that (14.2 mJ m−2) of the Nafion membrane, contributing to the good adhesion between the graphene film electrode and the electrolyte membrane. An electric double-layer is formed at the interface between the graphene film electrode and the ionic electrolyte membrane under the input potential, resulting in a higher capacitance of 27.6 mF cm−2. We report that this ionic actuator exhibits adequate bending strain, ranging from 0.032 to 0.1% (305 to 945 μm) as functions of voltage.
研究领域:
材料科学
·
电化学
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2024
·
IF 4.2
Duanhao Lu,Ying Yu,Yuxin Zuo,Yong Lv,Tianyu Zhang,You Li,Zhangfeng Zhao
Ionic electroactive polymer gels are widely employed as actuators in soft robotics due to their ability to undergo rapid mechanical deformation under low-voltage. How to improve the performance of the ionic electroactive polymer actuators is always the focus of research in this field. Optimizing the migration of ions within the actuator is crucial for enhancing the actuation performance. In this regard, this study innovatively introduces slot-die-printing technology to fabricate gel actuation layers characterized by high smoothness and uniform particle distribution, achieving seamless integration between the electrodes and gel actuation layers, while mitigating issues associated with ion accumulation due to polymer clustering. Furthermore, this study attempts to add lactic acid to the traditional CS-PVA-IL gel, effectively strengthening the connection between CS and PVA, and promoting smooth ion transport within the gel. The results demonstrate that the actuators prepared in this study achieved a high-bending-strain of 0.35%, with a retention rate of 91% for actuation displacement after 10 000 cycles, showcasing superior actuation performance compared to existing research. The fabrication method proposed in this study is simple and highly reproducible, making it suitable for widespread industrial application, and providing a new approach for future industrial production of soft robotics.
研究领域:
材料科学
·
机器人技术
·
聚合物科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Bozheng Wang,Peng Huang,Bingjue Li,Ze Wu,Youqiang Xing,Lei Liu
Ionic soft actuators are extensively utilized in soft robotics and intelligent flexible devices due to their low-voltage actuation capability. MXene(Ti 3 C 2 T x ) has potential value as an electrode material for ionic soft actuators owing to its high conductivity and large specific surface area. However, the actuation performance of its ionic soft actuator is limited by poor extensibility and low capacitance caused by the stacking effect. Here, a high-performance ionic soft actuator with MXene\polypyrrole-coated cellulose nanofibers (CNF@PPy) is reported. While gaining high flexibility of the electrode due to the great mechanical property of CNF, the fast conductive transport channel is constructed by doping CNF@PPy between MXene layers, which not only effectively reduces the loss of conductive properties and drastically improves the ion migration rate, but also prevents MXene from stacking and has additional chemical active sites, significantly increasing its ion storage capacity. Consequently, the actuator exhibits excellent actuation performance at the 0.5 V ultralow voltage: 0.79 % bending strain, 6 s rapid response, and 91.03 % high durability after 5 hours. Additionally, the potential for the actuating core of advanced flexible electronic devices is demonstrated by the application of flexible forceps and the flexible electronic eye.
研究领域:
材料科学
·
纳米技术
·
软体机器人
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Yongjun Tang,Zhigang Xue,Xingping Zhou,Xiaolin Xie,Chak-Yin Tang
A series of sulfonated polysulfone (SPSU) membranes with different degrees of sulfonation were prepared for fabricating cost-effective and high-performance ionic polymer–metal composite (IPMC) actuators. The experimental results show that the ion exchange capacity and water uptake of SPSU membranes increase with increasing their degree of sulfonation, and the proton conductivities of these hydrated membranes are subsequently enhanced. Compared with the commercial Nafion 117 ion exchange membrane, these SPSU membranes have higher ion exchange capacity and water uptake ability. Furthermore, the higher molecular rigidity of the SPSU membranes leads to higher tensile moduli in both dry and wet states than the Nafion membrane. The IPMC actuators made of the SPSU membranes demonstrate the large bending strain, fast response and excellent fatigue resistance under electric stimulation. Their electromechanical behaviors can be controlled by adjusting the sulfonation level of the SPSU ion exchange membranes.
研究领域:
材料科学
·
电化学
·
高分子科学
·
致动器技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）