IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
·
2021
·
IF 4.016
Xingyi Wu,Yijie Dai,Chen Fu,Xiaobo Zhu,Wenhua Gu,Daying Sun,Wen Wu,Xiaodong Huang,Zhongxiang Shen
Sheet resistance is one of the essential properties of thin films, and the change of it under different conditions is the basis of various sensor designs. However, the contact resistances between the thin-film materials and the metal electrodes can seriously affect the sensing accuracy. Due to various material properties, the contact resistances are usually difficult to be managed or reduced, and even nonlinear Schottky barriers can form in some cases. A modified four-terminal method is proposed to eliminate the impact of contact resistances through simple resistance measurements and algebraic calculations, which can be easily integrated into sensors and accurately measure the sheet resistances/resistivities of thin films of different materials under different conditions. The carbon black/polydimethylsiloxane (CB/PDMS) thin film is taken as an example for demonstration of the method. The applications for pressure-sensitive and temperature-sensitive resistance measurement are also demonstrated.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS
·
2022
·Vol. 22
·期 24
·9817
·
IF 3.847
Yifeng Huang,Yugen Chen,Fangming Deng,Xiaoming Wang
This paper proposes a flexible sensor for detecting cracks on bridges. Strain and deflection sensing modules are integrated on the film that is made of composite conductive materials. By optimizing the preparation ratio and internal structure, the strain detection accuracy and sensitivity of the sensor have been improved. The bridge crack detection accuracy reached 91%, which is higher than current sensors. Experimental results show that the composite material containing 2.23 wt% carbon black (CB) mixed hybrid filler has good linearity, higher accuracy than sensors in use, excellent stretchability (>155%), high gauge factor (GF ~ 43.3), and excellent durability over 2000 stretching-releasing cycles under 10 N. The designed flexible sensor demonstrates the practicality and effectiveness of bridge crack detection and provides a feasible solution for accurate bridge health monitoring in the future.
研究领域:
土木工程
·
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2022
·
IF 7.685
Hang Ding,Wenpeng Zang,Junjie Li,Yingjie Jiang,Hua Zou,Nanying Ning,Ming Tian,Liqun Zhang
Dielectric elastomer generator (DEG), consisting of highly deformable dielectric elastomer (DE) film sandwiched between compliant electrodes, can convert mechanical energy into electrical energy. The widely used carbon grease (CG) electrode has short service life. The conductive rubber electrode is the most promising electrode, but its properties still need to be improved to obtain DEG with high energy density and long life. In this study, thin electrode film of superconducting carbon black (CB)/Polydimethylsiloxane (PDMS) composite with smooth surface, uniform thickness and good dispersion of CB in PDMS matrix was prepared by using solution blending combined with ultrasonication followed by freeze drying and mask scraping technique. The strong interfacial bonding between the electrode and DE substrate was obtained by optimizing CB content and mask scraping technique and by using PDMS in both electrode and DE substrate. High elongation at break, good compliance, high electrical conductivity (EC) and high stability of EC were successfully obtained. Compared with DEG using CG electrode, the energy loss at the same conditions of DEG using the electrodes with 6 wt% CB is reduced by 40.3%, and the harvested energy density (up to 20.5 mJ/cm 3 ) increases by 32%. More importantly, CB/PDMS electrode can withstand 60,000 cycles of stretching under 200% strain, much higher than that reported in previous studies.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2024
·Vol. 35
·期 4
·045109
·
IF 2.7
Xiaoming Wang,Zhilong Guo,Yifeng Huang,Longbo Xiong,Daojin Yao,Wentao Dong
Strong winds can make a bridge's cable-stayed cables produce violent vibrations, leading to fatigue of the cable-stayed cables and damaging the cable-stayed bridge's structure. Accurately and effectively obtaining data on the wind loads applied to the cable-stayed cables is important for assessing the cable-stayed cables' health. The existing sensing elements for detection include diffusion silicon piezoresistive sensor, strain gauge, and other rigid sensors. However, most of them present such disadvantages as rigidity, difficult to fit the curved surface, high cost and low sensitivity. And it cannot be directly installed on the surface of the cable. In this paper, a conductive hydrogel flexible pressure sensor based on TA/CB@PDMS was developed, using carbon black (CB) as the main conductive medium, with good electrical conductivity, high sensitivity (0.65 kPa−1) and excellent tensile properties (210% tensile breakage). Meanwhile, a salt permeation method (Soak the sensor in LiBr solution) was used to effectively inhibit the sensor's water from being evaporated and frozen. Its substrate incorporates tannic acid to increase the sensor's adhesion so that it adheres well to the diagonal cable's surface. In this paper, the wind speed variation around the diagonal cable and the force distribution on the surface with considering the fluid-structure coupling effect are analyzed by ANSYS WORKBECH finite element simulation. Wind tunnel experiments simulate the sensor's force response when the inclined cable is subjected to different wind speeds, and the detection accuracy reaches 96.17%. The results show the sensor developed in this paper can realize accurate wind pressure detection of the inclined cable. This study provides a new method for wind pressure detection and health inspection of diagonal cables.
研究领域:
土木工程
·
材料科学
·
传感技术
·
结构健康监测
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）