Enhanced electromechanical properties of piezoelectric thin flexible films

Babu, Indu; With, G. de

doi:10.1016/j.compscitech.2014.08.022

Cited by 31 publications

(7 citation statements)

References 35 publications

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“…CB (N220, with an average particle diameter of 80 nm, supplied by CABOT Corporation) was chosen as the nanofiller, while PVDF (Kynar k721, with a density of 1.74 g/cm 3 and a melting point of ~158 ºC, supplied by ARKEMA) as the matrix, to fabricate a nanocomposite hybrid. The rudimental consideration of using CB as the nanofiller and PVDF as matrix lies in a twofold fact: (i) CB has a nano-scalar size and high specific surface area with PVDF, and it, compared with other nanofiller candidates such as CNTs, features much reduced amount of entanglement of nanoparticles [39][40][41], beneficial to the formation of an even, stable and uniform conductive network; (ii) PVDF, a thermoplastic material with higher elastic modulus, can present faster response to dynamic change than traditional rubber-based piezoresistive materials (rubber-based often exhibiting complex time-and frequencydependent viscoelastic properties, restricting them from being responsive to fast-change signals). Such a property of PVDF makes the hybrid highly responsive to dynamic elastic disturbance without marked hysteresis (to be demonstrated in sequent experiment).…”

Section: Materials Preparationmentioning

confidence: 99%

A coatable, light-weight, fast-response nanocomposite sensor for thein situacquisition of dynamic elastic disturbance: from structural vibration to ultrasonic waves

Zeng

Liu

et al. 2016

Smart Mater. Struct.

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Inspired by an innovative sensing philosophy, a lightweight nanocomposite sensor made of a hybrid of carbon black (CB)/polyvinylidene fluoride (PVDF) was developed. The nanoscalar architecture and percolation characteristics of the hybrid were optimized, in order to fulfil in-situ acquisition of dynamic elastic disturbance from low-frequency vibration to high-frequency ultrasonic waves. Dynamic particulate motion induced by elastic disturbance modulates the infrastructure of CB conductive network in the sensor, with introduction of the tunneling effect, leading to dynamic alteration in piezoresistivity measured by the sensor.Electrical analysis, morphological characterization, and static/dynamic electro-mechanical response interrogation were implemented, to advance insight into the sensing mechanism of the sensor, and meanwhile to facilitate ascertainment of an optimal percolation threshold. At the optimal threshold (~ 6.5 wt%), the sensor exhibits high-fidelity, fast-response, and highsensitivity to ultrafast elastic disturbance (in an ultrasonic regime up to 400 kHz) yet with an ultralow magnitude (of the order of micrometer). Performance of the sensor was evaluated, against conventional piezoelectric transducer and strain gauge, showing excellent coincidence, yet a much greater gauge factor and frequency-independent piezoresistive behaviours. Coatable to a structure and deployable in a large quantity to form a dense sensor network, this nanocomposite sensor has blazed a trail for implementing in-situ sensing for vibration-or ultrasonic wave-based structural health monitoring, by striking a compromise between "sensing cost" and "sensing effectiveness".

show abstract

Section: Materials Preparationmentioning

confidence: 99%

A coatable, light-weight, fast-response nanocomposite sensor for thein situacquisition of dynamic elastic disturbance: from structural vibration to ultrasonic waves

Zeng

Liu

et al. 2016

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Most studies still focus on lead zirconate titanate (PZT) ceramic as a filler for composite piezoelectric materials [27][28][29][30][31][32][33][34], but more and more interest is being shown for lead-free ceramics, such as barium titanate (BTO) [17,22,23,[35][36][37][38][39] and potassium-sodium niobate (KNN) [35,[40][41][42][43][44][45], since the evaporation of lead oxide during PZT sintering might be harmful [46].…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Ceramic/Photopolymer Composites Curable with UV Light: Viscosity, Curing Depth, and Dielectric Properties

Mitkus

Sinapius

2022

J. Compos. Sci.

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Four piezoelectric ceramic materials with varying particle sizes and geometries are added up to 30 vol.% to a photopolymer resin to form UV-curable piezoelectric composites. Such composites solidify in a few minutes, can be used in UV-curing-based 3D printing processes, and can achieve improved sensor performance. The particle dispersion with ultrasonication shows the most homogeneous particle dispersion with ethanol, while two other solvents produced similar results. The viscosities of the prepared suspensions show some dependency on the particle size. The curing depth results show a strong dependency on the ceramic particle size, the difference in refractive index, and the particle size distribution, whereby composites filled with PZT produced the worst results and composites filled with KNN produced the highest curing depths. The SEM images show a homogeneous dispersion of ceramic particles. The highest dielectric properties are also shown by KNN-filled composites, while BTO and PZT produced mixed results of dielectric constants and dielectric losses. KNN-filled composites seem to be very promising for further 3D-printable, lead-free piezoelectric composite development.

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“…The improvement of piezoelectric properties in such composites is achieved by increasing the dielectric properties of the polymer matrix by adding conductive nanomaterials to the matrix. Increased dielectric properties allow one to achieve a higher degree of polarization of piezoelectric particles inside the matrix, and thus higher piezoelectric output [2,3,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Characterization 0.1 wt.% Nanomaterial/Photopolymer Composites with Poor Nanomaterial Dispersion: Viscosity, Cure Depth and Dielectric Properties

2021

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Notably, 3D printing techniques such as digital light processing (DLP) have the potential for the cost-effective and flexible production of polymer-based piezoelectric composites. To improve their properties, conductive nanomaterials can be added to the photopolymer to increase their dielectric properties. In this study, the microstructure, viscosity, cure depth, and dielectric properties of ultraviolet (UV) light curable 0.1 wt.% nanomaterial/photopolymer composites are investigated. The composites with multi-walled carbon nanotubes (MWCNTs), graphene nanoplatelets (GNPs), and carbon black (CB) are pre-dispersed in different solvents (acetone, isopropyl alcohol, and ethanol) before adding photopolymer and continuing dispersion. For all prepared suspensions, a reduction in viscosity is observed, which is favorable for 3D printing. In contrast, the addition of 0.1 wt.% nanomaterials, even with poor dispersion, leads to curing depth reduction up to 90% compared to pristine photopolymer, where the nanomaterial dispersion is identified as a contributing factor. The formulation of MWCNTs dispersed in ethanol is found to be the most promising for increasing the dielectric properties. The post-curing of all composites leads to charge immobility, resulting in decreased relative permittivity.

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Enhanced electromechanical properties of piezoelectric thin flexible films

Cited by 31 publications

References 35 publications

A coatable, light-weight, fast-response nanocomposite sensor for thein situacquisition of dynamic elastic disturbance: from structural vibration to ultrasonic waves

A coatable, light-weight, fast-response nanocomposite sensor for thein situacquisition of dynamic elastic disturbance: from structural vibration to ultrasonic waves

Piezoelectric Ceramic/Photopolymer Composites Curable with UV Light: Viscosity, Curing Depth, and Dielectric Properties

Characterization 0.1 wt.% Nanomaterial/Photopolymer Composites with Poor Nanomaterial Dispersion: Viscosity, Cure Depth and Dielectric Properties

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