Nanomaterials
·
2022
·Vol. 12
·期 5
·882
·
IF 5.719
Linna Mao,Taisong Pan,Junxiong Guo,Yizhen Ke,Jia Zhu,Huanyu Cheng,Yuan Lin
Strain modulation based on the heterogeneous design of soft substrates is an effective method to improve the sensitivity of stretchable resistive strain sensors. In this study, a novel design for reconfigurable strain modulation in the soft substrate with two-phase liquid cells is proposed. The modulatory strain distribution induced by the reversible phase transition of the liquid metal provides reconfigurable strain sensing capabilities with multiple combinations of operating range and sensitivity. The effectiveness of our strategy is validated by theoretical simulations and experiments on a hybrid carbonous film-based resistive strain sensor. The strain sensor can be gradually switched between a highly sensitive one and a wide-range one by selectively controlling the phases of liquid metal in the cell array with a external heating source. The relative change of sensitivity and operating range reaches a maximum of 59% and 44%, respectively. This reversible heterogeneous design shows great potential to facilitate the fabrication of strain sensors and might play a promising role in the future applications of stretchable strain sensors.Keywords:strain sensor;strain engineering;heterogeneous design;two-phase liquid metal
研究领域:
材料科学
·
电子工程
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产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Xiashuang Luo,Cehuang Fu,Shuiyun Shen,Xiaohui Yan,Liuxuan Luo,Junliang Zhang
A comprehensive understanding of the intricate surface environments of practical nanocatalysts at the atomic level is essential for advancing our knowledge of catalytic mechanisms. In this study, we investigate PtCu octahedral nanoparticles with varying microstrains engineered by Cu dispersion. A detailed analysis of the atom configuration and corresponding microstrain is conducted. The intimate mixing of Cu and Pt results in increased randomness in atom displacement within the lattice and a more pronounced distribution of alternating microstrain on the surfaces. Specifically, we observe that the PtCu concave octahedral nanoparticles with alternating microstrain demonstrate a substantial oxygen reduction reaction (ORR) activity of 3.95 mA cm–2 in area-specific activity. The significant impact of shear microstrain is further underscored, as evidenced by an 86.9% decrease in the ORR activity upon the removal of the alternating shear microstrain. This study sheds light on the effects of microstrain toward the ORR and provides valuable insights into designing advanced Pt-based electrocatalysts.
研究领域:
材料科学
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电化学
·
催化科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Huihui Liu,Changrong Zhou,Jun Chen,Changlai Yuan,Shuai Cheng,Jiwen Xu,Qingning Li,Guohua Chen,Guanghui Rao
Ferroelectric ceramics with high electrostrain have been widely applied in actuators and sensors for their rapid response and precision. However, the current bottleneck is the inability to obtain superior electrostrain values along with high piezoelectric strain coefficient ( d 33 * ), limiting the practical applications. Herein, we report a remarkable enhancement of electrostrain values and d 33 * simultaneously in (Bi 0.5 Na 0.5 ) 0.93 Ba 0.07 Ti 1- x (Nb 0.5 Ga 0.5 ) x O 3 (BNBT- x NG, 0 ≤ x ≤ 0.06) ceramics with the integration of nonergodic/ergodic relaxor (NER/ER) boundary and defect engineering at room temperature. This strategy by combining NER/ER boundary and defect engineering allow for highly asymmetric strain-electric field (S-E) loops with an ultrahigh and temperature-insensitive electrostrain of 0.73% as well as giant piezoelectric strain coefficient of 913 pm/V simultaneously. The electrostrain value is greater than most of the reported lead-free ceramics and even exceeds those of conventional lead-based materials. This work suggests an effective method for developing new lead-free ceramics to achieve high piezoelectric response.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Electronic Materials Letters
·
2024
·
IF 2.1
Yao Yubo,Dai Hongfei,Ji Mengnan,Han Ying,Jiang Bo,Cheng Chi,Song Xiaolei,Song Ying,Wu Guangfeng
Flexible strain sensors that combine high sensitivity and wide range are important for developing wearable electronics. In this paper, AgNWs/MXene/SEBS flexible strain sensor with high sensitivity and wide strain range was prepared using a thermoplastic elastomer (styrene-ethylene-butene-styrene) SEBS as the polymer matrix and AgNWs and MXene as the composite conductive fillers. The sensitivity of the AgNWs/MXene/SEBS sensor is significantly higher than that of the AgNWs/SEBS and MXene/SEBS sensors based on a single conductive filler. At 100% strain, the AgNWs/MXene/SEBS sensor has a sensitivity of 176.25. The sensor detects small strains of 0.5-5% as well as large strains of 5–50% with high linearity. The sensors remained stable after 200 cycles. The AgNWs/MXene/SEBS tensile sensors were subjected to array testing and finger bending recognition, and the sensors have promising applications in human motion monitoring. Graphical Abstract
研究领域:
材料科学
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传感器技术
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Zhou Xuefan,Zhang Jun,Luo Hang,Zhang Yan,Tang Shiyu,Huang Houbing,Yuan Xi,Song Miao,Qi He,Zhang Dou
The trade-off between electrostrain and strain hysteresis for piezo/ferroelectric materials largely restrains the development of high precision actuators and remains unresolved over the past few decades. Here, a simple composition of (Bi 0.5 Na 0.5 ) 1- x /100 Sr x /100 TiO 3 in the ergodic relaxor state is collaboratively designed through the segregated domain structure with the ferroelectric core, local polarization heterogeneity, and defect engineering. The ferroelectric core can act as a seed to facilitate the field-induced nonpolar-to-polar transition. Together with the internal bias field caused by defect dipoles and adjusted through electric field cycling and heat treatment technology, a giant unipolar strain of 1.03% is achieved in the x = 30 ceramic with a low hysteresis of 27%, while the electric-field-independent large-signal piezoelectric strain coefficient of ~1000 pm/V and ultralow hysteresis of <10% can be obtained in the x = 35 ceramic. Intriguingly, the low-hysteresis high strain also exhibits near-zero remnant strain, excellent temperature and cycling stability.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2019
·Vol. 16
·期 6
·2206-2213
·
IF 1.074
Mi Wang,Dewen Kong,Lingling Wang,Youbin Li,Ting Cai
The quasi-static, dynamic compression experiments and micromechanical model were employed to declare the dynamic compressive response of ZrB 2 –20%SiC composite at high-strain rates. The quasi-static compressive strengths were measured to determine the range of initial microcrack length in ZrB 2 –20%SiC composite. The effects of the strain rate on dynamic compressive strength, critical stain, as well as fracture mechanisms were discussed based on experimental results. Dynamic mechanical properties of ZrB 2 -based composites display obvious strain rate dependence. The dynamic increase factor in the compressive strength shows a rapid increase above a transition strain rate of 1228 s −1 . Moreover, a micromechanical model considering initial microcrack lengths is used to predict dynamic compressive strengths, which agree with the experimental results. Additionally, the critical strain has a linear increase tendency with the increase of strain rate. The dynamic compressive fracture mechanism of ZrB 2 –20%SiC composite is relative to the combination effect between strain rate and microstructure. The size of flaw distribution is critical below the transition strain rate resulting in bigger fragments, whereas the flaw density is primary with more and smaller fragments above the transition strain rate.
研究领域:
材料科学
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力学
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
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2024
·
IF 2.2
Huang Fei,Huang Chen,Meng Fenye,Aw Kean Chin,Yan Xiong,Hu Jiyong
Yarn-based strain sensors are breaking the boundaries between flexible wearable electronics and smart clothing due to their unique functionality and weavability. The sensing strain range of most flexible strain sensors is less than its tensile range, and it is easy to exceed its sensing strain range during use, resulting in unstable performance and failure of the sensor. An effective-strain-range-controllable and wear-resistant yarn strain sensor was developed with a core-sheath braided structure with the sensing yarn as the core and the braided yarn as the shell. This design strain allows for control over the effective strain range by adjusting the core sensing yarn’s pre-stretch ratio and the outer braided layer’s structure. This prevents damage to the conductive network and sensor failure caused by excessive stretching during use. The sensitivity, linear sensing range, and hysteresis of the braided strain sensors are effectively adjusted by changing the braiding yarns’ braiding angle and the sensing yarn’s pre-stretch ratio. Additionally, the sensors’ appearance and texture can be customized by changing the colour and material of the braiding yarns, allowing these sensors to integrate seamlessly with the garment and enhance their aesthetics. Furthermore, when combined with elastic fabric bands, these sensors can be attached to various parts of the human body to monitor physiological information, such as respiration and movement. The braided structure design presents a versatile strategy that could be applied to other types of strain sensors, achieving stability, durability, and aesthetics simultaneously.
研究领域:
材料科学
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柔性电子
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纺织工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 43
·18429-18436
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IF 2.7
Yan Zhuang,Kai Gong,Jianhui Sun,Zishi Jiang,Yiqian Li,Peng Li
Traditional silica-based optical fiber strain sensors suffer from a limited range of strain detection, mismatched mechanical performance, and complicated sensing structures that hinder their practical applications involving complex strain patterns and large strain measurement. To solve these issues, the development of novel flexible optical fiber strain sensors with distributed and multimodal strain sensing performance is critical but challenging. In this work, a flexible hydrogel optical fiber with a step-index core/cladding structure was successfully designed and fabricated using a simple thermal polymerization method involving calcium alginate and polyacrylamide. The resulting flexible fiber exhibited a large stretch deformation capacity and good optical transmission property as well as an effective and reversible strain response. Significantly, a flexible hydrogel functional fiber was further constructed by doping quantum dots with different fluorescent emission wavelengths in different positions. By exploiting a combination of emission wavelength encoding and transmission loss, the assembled flexible hydrogel functional optical fibers could distinguish and recognize the locations, magnitudes, and modes (stretch or bend) of mechanical deformation through a single wavelength of visible light (365 nm) excitation. An ultra-large dynamic range (0–120%) of axial strain and bending deformation (10°–80°) could be effectively detected. This work offers a versatile solution to develop promising stretchable and distributed fiber strain sensors.
研究领域:
材料科学
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光学工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Fan Hao,Liangyu Wang,Binling Chen,Lin Qiu,Jun Nie,Guiping Ma
Smart response hydrogel has a broad application prospect in human health real-time monitoring due to its responses to a variety of stimuli. In this study, we developed a novel smart hydrogel dressing based on conductive MXene nanosheets and a temperature-sensitive PNIPAm polymer. γ-Methacryloxypropyltrimethoxysilane (KH570) was selected to functionalize the surface of MXene further to improve the interface compatibility between MXene and PNIPAm. Our prepared K-M/PNIPAm hydrogel was found to have a strain-sensitive property, as well as a respond to NIR phase change and volume change. When applied as a strain flexible sensor, this K-M/PNIPAm hydrogel exhibited a high strain sensitivity with a gauge factor (GF) of 4.491, a broad working strain range of ≈250%, a fast response of ∼160 ms, and good cycle stability (i.e., 3000 s at 20% strain). Besides, this K-M/PNIPAm hydrogel can be used as an efficient NIR light-controlled drug release carrier to achieve on-demand drug release. This work paved the way for the application of smart response hydrogel in human health real-time monitoring and NIR-controlled drug release functions.
研究领域:
材料科学
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生物医学工程
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纳米技术
·
健康监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Engineering Research Express
·
2023
·Vol. 5
·期 1
·015080
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IF 1.7
Kunpeng Gao,Qianjin Wang,Junqi Tang,Yingkai Liu
Resistive-type strain sensors have been widely studied because of their high precision and convenient measurement. But the high sensitivity and large strain range of this kind of sensor conflict with each other. It is difficult to prepare a sensor with high sensitivity and a large tensile range at the same time. Here, we propose a method to use AgNWs/Ag microparticles (AgMPs) and PDMS to simultaneously manufacture two strain sensors with different principles, a crack-based sensor and a composite-based sensor. On the one hand, the crack-based sensor has a low detection limit of 0.5% strain and high sensitivity of GF ≈ 90 at the strain of 0 ∼ 50%. It is suitable for the detection of small strains and can detect throat vibration when speaking. On the other hand, the composite-based sensor has a large strain range of 0 ∼ 240% and excellent stability. After 1000 cycles of stretching-releasing at 50% strain, the resistance change rate remains unchanged. It is suitable for the detection of large strains. Moreover, the sensitivity and working range of the composite-based sensor can be adjusted by changing the ratio and total amount of AgNWs/AgMPs composites. It can accurately monitor the different bending angles of the elbow joint and a people's walking status and pace. The strain sensor prepared by this method has great practical value in wearable devices and electronic skin.
研究领域:
材料科学
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生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Qi Huang,Yadong Jiang,Zaihua Duan,Yuanming Wu,Zhen Yuan,Mingxiang Zhang,Qiuni Zhao,Yajie Zhang,Bohao Liu,Huiling Tai
The self-powered strain sensors based on piezoelectric and triboelectric principles have been widely reported in flexible electronics, but they cannot achieve static strain detection. Inspired by electrochemical reactions , we propose and construct an electrochemical self-powered strain sensor for static and dynamic strain detections. Specifically, the sensor is composed of Cu/Al electrodes, elastic core-spun yarn coated with LiCl-carbon nanotubes (CNTs), and latex tube encapsulation. Among them, Cu and Al electrodes are used for electrochemical reactions; Elastic core-spun yarn endows the sensor with excellent tensile performance; LiCl provides conductive ions in electrochemical reactions; CNTs with good conductivity not only reduce the resistance between Cu and Al electrodes, but also facilitate good resistance strain effect; Latex tube encapsulation inhibits the evaporation of water molecules in the electrolyte. The strain sensing performance of the sensor is evaluated based on the current response. The results show that the sensor has wide strain detection range (2–100 %) and good repeatability (1000 times). By analyzing the strain voltage and current responses, as well as the morphology characterization of the sensor, the strain response mechanism of the sensor has been clarified, which is controlled by electrochemical reactions and resistance strain effect. The static strain monitoring function of the sensor is verified by monitoring finger bending. Combined with machine learning, the sensor can be used for respiratory behavior recognition. This work fundamentally contributes to developing self-powered strain sensor with static and dynamic strain detections.
研究领域:
材料科学
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电子工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 31
·e202402076
·
IF 1.9
Hengyi Cheng,Xun Zhang,Tao Zhang,Yixiang Chen,Dan Yu,Wei Wang
Graphical The figure shows the preparation process of TPU/PDA/MXene composite fibers. TPU fibers were first prepared by dissolving TPU particles in a certain amount of DMF solution, but since TPU fibers are inherently non-conductive, it was necessary to surface modify the TPU fibers. PDA was polymerized in situ on the fiber surface and then placed in MXene solution for ultrasonication to obtain composite fibers. With the development of the ageing society, wearable strain sensors have great application prospects in the fields of health detection, artificial intelligence, and motion recognition. However, traditional forms of film-like strain sensors suffer from low sensitivity, adhesion, and impermeability during use, which severely limit their practical applications. To overcome these problems, we propose a strategy to fabricate polyurethane/polydopamine/MXene (TPU/PDA/MXene) composite fibers by wet spinning. Furthermore, the outside is wrapped with (PDMS), giving mechanical strength and chemical resistance. Through a simple and low-cost wet spinning process, TPU/PDA/MXene fibers are achieved in the preparation of flexible strain sensors, and they can be woven into various forms with good flexibility and comfort according to practical needs. The results indicated that the prepared flexible strain sensor exhibits a high gauge factor (GF) of 57.15 over a large strain range (300 %), which are superior to those of many fiber-based sensors. Their application properties were also measured by attaching them to fingers, wrists and knees, showing high sensitivity, mechanical durability and chemical stability, and has great potential for wearable strain sensors and flexible strain sensors in complex environments.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）