The effect of reduced graphene oxide on the dielectric and ferroelectric properties of PVDF–BaTiO<sub>3</sub> nanocomposites

Yaqoob, Usman; Uddin, A.S.M. Iftekhar; Chung, Gwiy‐Sang

doi:10.1039/c6ra03155b

Cited by 72 publications

(56 citation statements)

References 36 publications

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“…Adding piezoelectric nanoparticles to the polymer matrix can negatively affect the piezoelectric performance of the composite because of the positive and negative piezoelectric co‐efficient of BT nanoparticle and PVDF polymer and canceling their effect 30,60,66…”

Section: Resultsmentioning

confidence: 99%

“…Among the variety of materials exhibiting piezoelectricity, polymers are of interest due to several enhanced properties desirable in flexible piezoelectric generators. Recently, much attention has been paid to poly(vinylidene fluoride)29,30 (PVDF). This nontoxic material is a semicrystalline polymer that exists in four different crystalline forms (α, β, γ, and δ)31 depending on the preparation conditions 32.…”

Section: Introductionmentioning

confidence: 99%

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Wearable Electronic Textiles from Nanostructured Piezoelectric Fibers

Mokhtari

Spinks

Fay

et al. 2020

Adv Materials Technologies

129

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to produce a new generation of smart garments.Such affordable smart garments could fulfil diverse applications, ranging from work wear in specific industries to the almost infinite scenarios of personal use including energy harvesting/storage, force/pressure measurement, porosity or color variation, and sensors (movement, temperature, chemicals). [1][2][3][4][5][6][7] However, performance, scalability, and cost problems have restricted the deployment of currently available smart textiles. To build smart textiles on an industrial scale, method of manufacturing and material selection are two important requirements. The approach of new energy materials and novel fabrication methods are essential to develop wearable technologies. Wearable energy generating devices that can be seamlessly integrated into garments are a critical component of the wearable electronics genre. Currently flexible fiber energy harvesters have attracted significant attention due to their ability to be integrated into fabrics, or stitched into existing textiles. Large-scale production of energy harvester fibers using conventional manufacturing processes, however, is still a challenge.Energy harvesting from environmental mechanical sources such as body movements including finger imparting, [8] pushing, [9] stretching, [10] bending, [11] twisting, [12] air flow, [13] transportation movement, [14] and sound waves [15] has attracted widespread attention to promote flexible self-powered devices. [16] The best common mechanical energy harvesting methods are based on piezoelectric materials. [17] Piezoelectric materials can be classified in three categories: piezoelectric ceramics, piezoelectric polymers, and piezoelectric composites. [18] Unlike the energy harvesters utilizing solar or thermal energy, performance of piezoelectric generators is generally not limited by environmental factors. [19] Piezoelectric generators have received massive interest in energy harvesting technology due to their unique ability to capture the ambient vibrations to generate electric signals. [20] The unique energy transduction of piezoelectric materials enables their applications in fields of energy harvesting, actuators, [21] sensors, [22] structural health monitoring, and use in biomedical devices. [23] Numerous approaches have been used to fabricate piezoelectric generators, such as coating, [24] spinning, [25] depositing, [26] and printing. [27] Wearable energy harvesting is of practical interest for many years and for diverse applications, including development of self-powered wireless sensors within garments for human health monitoring. Herein, a novel approach is reported to create wearable energy generators and sensors using nanostructured hybrid piezoelectric fibers and exploiting the enormous variety of textile architectures. It is found that high performance hybrid piezofiber is obtained using a barium titanate (BT) nanoparticle and poly(vinylidene fluoride) (PVDF) with a mass ratio of 1:10. These fibers are knitted to form a wearable energy generator that pr...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wearable Electronic Textiles from Nanostructured Piezoelectric Fibers

Mokhtari

Spinks

Fay

et al. 2020

Adv Materials Technologies

129

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“…Intensity of peak of α- XRD patterns of neat polymer and nanocomposite are shown in Figure 3A. In XRD pattern of pure PVDF, peaks at 20.4 • and 29.7 • are indicative of the beta (β) and alpha (α) phases of PVDF, respectively [21]. In XRD patterns of nanocomposites, the peaks located at 25.…”

Section: Characterization Of Graphene/titania/polyvinylidene Fluoridementioning

confidence: 99%

“…XRD patterns of neat polymer and nanocomposite are shown in Figure 3A. In XRD pattern of pure PVDF, peaks at 20.4° and 29.7° are indicative of the beta (β) and alpha (α) phases of PVDF, respectively [21]. In XRD patterns of nanocomposites, the peaks located at 25.7°, 37.9°, 54.1°, 69.1° and 75.3° correspond to (101), (004), (211), (220) and (215) are diffraction peaks of anatase TiO2.…”

Section: Characterization Of Graphene/titania/polyvinylidene Fluoridementioning

confidence: 99%

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Dielectric Properties of Graphene/Titania/Polyvinylidene Fluoride (G/TiO2/PVDF) Nanocomposites

et al. 2020

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Flexible electronics have gained eminent importance in recent years due to their high mechanical strength and resistance to environmental conditions, along with their effective energy storage and energy generating abilities. In this work, graphene/ceramic/polymer based flexible dielectric nanocomposites have been prepared and their dielectric properties were characterized. The composite was formulated by combining graphene with rutile and anatase titania, and polyvinylidene fluoride in different weight ratios to achieve optimized dielectric properties and flexibility. After preparation, composites were characterized for their morphologies, structures, functional groups, thermal stability and dielectric characterizations by using scanning electron microscopy, X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis and impedance spectroscopy. Dielectric results showed that prepared flexible composite exhibited dielectric constant of 70.4 with minor leakage current (tanδ) i.e., 0.39 at 100 Hz. These results were further confirmed by calculating alternating current (AC) conductivity and electric modulus which ensured that prepared material is efficient dielectric material which may be employed in electronic industry for development of next generation flexible energy storage devices.

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Highly Stretchable Self‐Powered Wearable Electrical Energy Generator and Sensors

Mokhtari

Spinks

Sayyar

et al. 2020

Adv Materials Technologies

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The ubiquity of wearables, coupled with the increasing demand for power, presents a unique opportunity for fiber‐based mobile energy generator systems. However, no commercially available systems currently exist with typical problems including low energy efficiency; short cycle life; slow and expensive manufacturing; and stiff, heavy or bulky componentry that reduce wearer comfort and aesthetic appeal. Herein, a new method is demonstrated to create wearable energy generators and sensors using nanostructured hybrid polyvinylidene fluoride (PVDF)/reduced graphene oxide (rGO)/barium‐titanium oxide (BT) piezoelectric fibers and exploiting the enormous variety of textile architectures. Highly stretchable piezoelectric fibers based on coiled PVDF/rGO/BT fibers energy generator and sensor are developed. It is found that the coiled PVDF/ rGO/BT enables to stretch up to ≈100% strain that produces a peak voltage output of ≈1.3 V with a peak power density of 3 W Kg−1 which is 2.5 times higher than previously reported for piezoelectric textiles. An energy conversion efficiency of 22.5% is achieved for the coiled hybrid piezofiber energy generator. A prototype energy generator and sensors based on a hybrid piezofibers wearable device for energy harvesting and monitoring real time precise healthcare are demonstrated.

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The effect of reduced graphene oxide on the dielectric and ferroelectric properties of PVDF–BaTiO₃ nanocomposites

Abstract: Formation process of the insulator–conductor–insulator sandwich structure. After addition of the BTO NPs into the PVDF–GO solution, a 3 μm thin film was achieved by a spin coated method.

Cited by 72 publications

References 36 publications

Wearable Electronic Textiles from Nanostructured Piezoelectric Fibers

Wearable Electronic Textiles from Nanostructured Piezoelectric Fibers

Dielectric Properties of Graphene/Titania/Polyvinylidene Fluoride (G/TiO2/PVDF) Nanocomposites

Highly Stretchable Self‐Powered Wearable Electrical Energy Generator and Sensors

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The effect of reduced graphene oxide on the dielectric and ferroelectric properties of PVDF–BaTiO3 nanocomposites

Abstract: Formation process of the insulator–conductor–insulator sandwich structure. After addition of the BTO NPs into the PVDF–GO solution, a 3 μm thin film was achieved by a spin coated method.

Cited by 72 publications

References 36 publications

Wearable Electronic Textiles from Nanostructured Piezoelectric Fibers

Wearable Electronic Textiles from Nanostructured Piezoelectric Fibers

Dielectric Properties of Graphene/Titania/Polyvinylidene Fluoride (G/TiO2/PVDF) Nanocomposites

Highly Stretchable Self‐Powered Wearable Electrical Energy Generator and Sensors

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Product

Resources

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The effect of reduced graphene oxide on the dielectric and ferroelectric properties of PVDF–BaTiO₃ nanocomposites