ZnO nanowires–polyimide nanocomposite piezoresistive strain sensor

Chen, Qian; Sun, Yingying; Wang, Ying; Cheng, Hongbin; Wang, Qing-Ming

doi:10.1016/j.sna.2012.11.006

Cited by 44 publications

(28 citation statements)

References 18 publications

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“…Taking advantage of various functional nanomaterials, exciting progress has been made in strain sensors based on nanocomposites in the last decade or so. 7 , 8 Compared to traditional rigid metallic strain gauges, flexible nanocomposite strain sensors exhibit high strain tolerance, fast response, high sensitivity, low power consumption, and high sensitivity to conformal geometric changes. 8 − 10 …”

Section: Introductionmentioning

confidence: 99%

“…Most flexible/stretchable strain sensors rely on the piezoresistive effect, and strain sensitivity, the so-called gauge factor (G.F.), is defined by the specific conductivity change per unit strain ϵ (G.F = (Δσ/σ 0 )/ϵ). 7 , 11 In the case of nanocomposites, which consist of piezoelectric nanostructures, 9 such as nanoparticles (NP), nanowires (NWs), and nanotubes, 10 and so forth, mixed with polymers, 12 including polyvinylidene fluoride (PVDF), polydimethylsiloxane (PDMS), and polymethyl methacrylate (PMMA), 13 − 16 the sensor conductivity is measured over the entire nanocomposite sample. Various piezoelectric materials studied for strain sensors include zinc oxide (ZnO), lead zirconate titanate, and lead titanate.…”

Section: Introductionmentioning

confidence: 99%

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Flexible Zinc Oxide Nanowire Array/Graphene Nanohybrid for High-Sensitivity Strain Detection

et al. 2020

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A fully flexible strain sensor consisting of vertically aligned ZnO nanowires on graphene transferred on polyethylene terephthalate with prefabricated Au/Ti electrodes (ZnO-VANWs/Gr)/PET) has been obtained. The ZnO-VANWs were grown in solution using a seedless hydrothermal process and are single-crystalline of (0001) orientation that provides optimal piezoelectric gating on graphene when deformed mechanically. The change of the graphene channel conductance under such a piezoelectric gating through transduction of the mechanical deformation on the ZnO-VANWs/Gr was used to detect the strain induced by the deformation. Under applied normal forces of 0.30, 0.50, and 0.70 N in a dynamic manner, the ZnO-VANWs/Gr/PET strain sensors exhibited a high response and response times of ∼0.20 s to both force on and off were achieved. Under mechanical bending curvatures of 0.18, 0.23, 0.37, and 0.45 cm –1 , high sensitivity of the gauge factors up to ∼248 and response times of 0.20 s/0.20 s (rise/fall) were achieved on the ZnO-VANWs/Gr/PET strain sensors. Moreover, the response changes polarity when the directions of bending alters between up and down, corresponding to the polarity change of the space charge on the ZnO-VANWs/Gr interface as a consequence of the compressive and tensile strains along the ZnO-VANWs. This result shows that the low-cost and scalable ZnO-VANWs/Gr/PET strain sensors are promising for applications in stress/strain monitoring, wearable electronics, and touch screens.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexible Zinc Oxide Nanowire Array/Graphene Nanohybrid for High-Sensitivity Strain Detection

et al. 2020

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“…The increase of current at the tipping point may be due to the capacitance of the sample between conductive electrodes. Chen et al [7] cleared that the contact resistance of the electrodes Re is negligible and then the sample may be considered as a parallel connection of a variable resistance and a variable capacitor (see Diagram 2).Therefore, it was essential to confirm this deduction by measuring the effect of capacitive feature of the sample on the measured sample current under different loads. Figure 10 shows the capacitance of the produced QTC with ratio of 1 : 1 at different applied loads.…”

Section: Case Studymentioning

confidence: 99%

Automatic Technique for Measuring The Electro-Mechanical Characteristics Of Quantum Tunneling Composites (QTC)

El‐Tonsy¹,

Shaaban²,

O.M.Al-Aqbi³

et al. 2015

IJSEA

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Abstract:Electrically conductive composites consisted of conducting fillers and the insulating polymer matrix. These composites could serve in preparation of piezoresistive composites (i.e. quantum tunnelling composites (QTC) due to their flexibility, light weight, easy processing, low cost, greater resistance changes, and ease of spreading over arbitrary curved surfaces.QTC have attracted tremendous attention due to their potential applications in advanced stress and strain sensors. Recently, various types of conducting materials and many soft polymers have been utilized in the manufacture of QTCs. Characterization of such composites involves several physical parameters. Therefore, a low cost technique was designed and manufactures in order to measure most of electro-mechanical properties of the produced composites with good accuracy and repeatability. QTCs were prepared by mixing poly-dimethyl siloxane (PDMS) and with different concentrations of graphite flakes (1:0.75, 1:1, 1:1.5, 1:1.75 and 1:2). This study declared the efficiency of the suggested technique as well as some fundamental features of the prepared composite. For example, conductivity of the composites containing higher concentration of graphite was found to be independent on rate of pressing during the test. It was also found that the capacitive behavior of the sample interrupted the flow of current at the instant of removing the applied pressure. The suggested setup has several advantages such as simplicity, high accuracy and providing lots of technical data that required for development and confirmation of models for the quantum tunnelling process.

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“…ZnO NRs/NWs are extensively applied in various sensing applications fields, e.g. biosensors [44][45][46][47][48][49][50][51], biomarker [52][53], drug delivery [54][55] , chemical sensors [56][57][58], gas sensors [59][60], pH sensors [61], humidity sensor [62][63][64], UV sensors [65][66][67][68][69], temperature sensors [70][71], and pressure/force/mass/load sensors [72][73][74][75]. Also, the high performances of several types of sensors have been enhanced by utilizing different metals doped ZnO nanorods, e.g.…”

Section: Sensing Applications Based On Zno and Tm-doped Zno Nanostrucmentioning

confidence: 99%

Synthesis of ZnO and transition metals doped ZnO nanostructures, their characterization and sensing applications

Chey

2015

Linköping Studies in Science and Technology. Dissertations

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ZnO nanowires–polyimide nanocomposite piezoresistive strain sensor

Cited by 44 publications

References 18 publications

Flexible Zinc Oxide Nanowire Array/Graphene Nanohybrid for High-Sensitivity Strain Detection

Flexible Zinc Oxide Nanowire Array/Graphene Nanohybrid for High-Sensitivity Strain Detection

Automatic Technique for Measuring The Electro-Mechanical Characteristics Of Quantum Tunneling Composites (QTC)

Synthesis of ZnO and transition metals doped ZnO nanostructures, their characterization and sensing applications

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