Piezoresistive characteristics of CNT fiber-incorporated GFRP composites prepared with diversified fabrication schemes

Khalid, Hammad R.; Nam, I.W.; Choudhry, Iqra; Zheng, Lianxi; Lee, Haeng‐Ki

doi:10.1016/j.compstruct.2018.08.003

Cited by 12 publications

(3 citation statements)

References 38 publications

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“…Minor defects generation above 0.015 strain affected the linearity of the electrical resistance change for both samples, showing a slight increase in slope and decline towards failure. This trend was also observed in [26], where piezoelectric properties of GFRP composites embedded with CNTs using different techniques were explored. Addition of Terfenol-D nanoparticles to the sample enabled the characterization of the Villari effect.…”

Section: Resultssupporting

confidence: 60%

Smart Self-Sensing Composite: Piezoelectric and Magnetostrictive FEA Modeling and Experimental Characterization Using Wireless Detection Systems

Qhobosheane

Elenchezhian

Das

et al. 2020

Sensors

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This research work focuses on the development of a piezoelectric magnetostrictive smart composite with advanced sensing capability. The composite piezoelectric property is achieved from the dispersion of single-walled carbon nanotubes (SWCNTs) and the magnetostrictive property from Terfenol-D nanoparticles. Finite element analysis (FEA) is used to examine the feasibility of modelling the piezoelectric (change in electric field) and magnetostrictive (change in magnetic field) self-sensing responses in the presence of applied stress. The numerical work was coupled with a series of mechanical tests to characterize the piezoelectric response, magnetostriction response and mechanical strength. Tensile tests of the composite samples manufactured as is (virgin), samples with SWCNTs, samples with Terfenol-D nanoparticles and samples with both SWCNTs and Terfenol-D nanoparticles were conducted. It was observed that an increase in volume fraction of Terfenol-d nanoparticles increases the change in magnetization, therefore increasing voltage response up to the point of saturation. The optimum change in amplitude was observed with 0.35% volume fraction of Terfenol-D nanoparticles. A constant ratio of SWCNTs was maintained, and maximum change in electrical resistance was at 7.4%. Fracture toughness for the samples with all nanoparticles was explored, and the results showed improved resistance to crack propagation.

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Section: Resultssupporting

confidence: 60%

Smart Self-Sensing Composite: Piezoelectric and Magnetostrictive FEA Modeling and Experimental Characterization Using Wireless Detection Systems

Qhobosheane

Elenchezhian

Das

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…Some examples of these materials are graphene, carbon nanotubes, and silicon nanowires. [1][2][3] However, it is important to bear in mind the complex in situ growth techniques and fragile transfer of these materials for sensor integration. As such, the current challenges for MEMS force sensors are to enhance production of promising materials with high piezoresistive performance using facile technology.…”

mentioning

confidence: 99%

Piezoresistive behavior of amorphous carbon films for high performance MEMS force sensors

Guo

Tong

et al. 2019

Applied Physics Letters

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In this study, microelectromechanical systems (MEMS) force sensors based on H-free amorphous carbon (a-C) films with controlled piezoresistive behavior were fabricated by a facile magnetron sputtering technique. By adjusting the substrate bias voltage from 0 V (floating state) to-350 V, the gauge factor (GF) of the a-C film was modulated in the range of 1.4-12.1. Interestingly, the GF showed a strong dependence on the sp 2 content and the sp 2 cluster size of the film, which was consistent with the theory of thick film resistors. In addition, the sensitivity of a-C based MEMS force sensors reached 80.7 lV/V/N in the force range of 0-1.16 N, with a nonlinearity of approximately 1.3% full scale and good repeatability in over 5000 test cycles.

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“…Although these modified metals have superior conductivity, they still present few constraints such as cost-ineffectiveness, brittleness, poor mechanical strength, and plastic yielding. To address these limitations, graphitic carbons have been employed as conducting electrodes because of their extraordinary electrical, mechanical, and thermal properties. , Zhu et al embedded carbon nanotube (CNT) ribbons in PDMS and reported a slight resistance change (4.1%) in the wavy electrodes upon 100% stretching. This achieved stability of electrodes suggests that graphitic carbon-based nanocomposites can be attractive alternatives to costly metal electrodes.…”

Section: Introductionmentioning

confidence: 99%

Flexible Piezoelectric Transducers for Energy Harvesting and Sensing from Human Kinematics

Choudhry

Khalid

Lee

2020

ACS Appl. Electron. Mater.

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This study reports flexible nanocomposite-based piezoelectric nanogenerators (PENGs) fabricated by dispersing various piezoelectric nanoparticles (BaTiO3, ZnO, and PZT) and graphene nanopowder in a silicone matrix. The results indicated that the PZT-based composites showed superior performance in comparison to other ceramics. Subsequently, practical application of PENGs was demonstrated by developing a fully functioning shoe-insole nanogenerator (SING). The SING generated high open-circuit voltage (∼27 V), short-circuit current (429.23 μA), and power density (402 mW/m2) under real-time human walking. Moreover, a facile and inexpensive fabrication method for efficient, skin-friendly, and highly stretchable biomechanical piezoelectric sensors is also proposed. In this regard, multiwall carbon nanotubes/silicone composite stretchable electrodes were prepared to be compatible with the sensors. The electrodes displayed stability even under high uniaxial elongation (100%), and the fabricated sensors responded effectively to almost every joint movement. The results suggested that the fabricated PENGs can be potentially used as self-powered biomechanical energy harvesters/sensors in wearable electronics, haptic sensing, or internet of human-related applications.

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Piezoresistive characteristics of CNT fiber-incorporated GFRP composites prepared with diversified fabrication schemes

Cited by 12 publications

References 38 publications

Smart Self-Sensing Composite: Piezoelectric and Magnetostrictive FEA Modeling and Experimental Characterization Using Wireless Detection Systems

Smart Self-Sensing Composite: Piezoelectric and Magnetostrictive FEA Modeling and Experimental Characterization Using Wireless Detection Systems

Piezoresistive behavior of amorphous carbon films for high performance MEMS force sensors

Flexible Piezoelectric Transducers for Energy Harvesting and Sensing from Human Kinematics

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