Fabrication of Nickel NanoChains/PVDF Nanocomposites and Their Electrical/Magnetic Properties

Martin, Baptiste; Dantras, Éric; Lonjon, Antoine; Laffont, Lydia; Lacabanne, C.

doi:10.1002/pssa.201900158

Cited by 4 publications

(6 citation statements)

References 42 publications

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“…It was already observed on nanochains obtained by polyol reduction. [30] The layer thickness is around 10 nm, which is consistent with the previous observation on nickel particles.…”

Section: Ag@ni Nws Surface and Texture Analysissupporting

confidence: 92%

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Nickel‐Decorated Silver Nanowires for Polymer‐Based Magnetoelectric Composite

Martin

Dantras

Lonjon

et al. 2021

Physica Status Solidi (a)

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Polymer-based magnetoelectric composites are processed with an intrinsic piezoelectric poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)) matrix and high-aspect-ratio magnetic nickel-decorated silver nanowires. These core/ shell wires are obtained by the polyol reduction of Ni 2þ ions on high-aspect-ratio silver nanowires. Scanning electron microscopy and transmission electron microscopy analyses show a homogeneous and well-crystallized nickel layer. Magnetic properties of the intrinsic particles and their composites are measured and show a strong enhancement of the coercive field compared to spherical Ni nanopowders. They also show the existence of strong magnetic anisotropy in the composites. The composites processed with a small amount of metallic particles (0.3 vol%) allow the maintaining of the P(VDF-TrFE) crystalline phase and the ability of a macroscopic polarization. The latter is conducted under a 80 MV m À1 field, leading to a significant d 33 (3.2 pC N À1 ). Thus, the magnetoelectric properties are analyzed and an important coupling coefficient α ME equal to 1.8 V m À1 Oe À1 is measured.

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“…It was already observed on nanochains obtained by polyol reduction. [30] The layer thickness is around 10 nm, which is consistent with the previous observation on nickel particles.…”

Section: Ag@ni Nws Surface and Texture Analysissupporting

confidence: 92%

“…This phenomenon associated with the particles’ aspect ratio has been already observed in the case of nickel nanochains. [ 30 ] Due to the silver core, the magnetization remains lower than that of pure nickel particles. Nevertheless, the aspect ratio has a strong enhancement effect on H C .…”

Section: Resultsmentioning

confidence: 99%

Nickel‐Decorated Silver Nanowires for Polymer‐Based Magnetoelectric Composite

Martin

Dantras

Lonjon

et al. 2021

Physica Status Solidi (a)

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“…We showed in a previous work that p C = 2.3 vol% for PVDF / NNCs [19]. The proximity of the percolation threshold explains why ' reaches such a high value.…”

Section: Electrical Propertiesmentioning

confidence: 66%

“…These pseudo spherical particles were assembled under the influence of a magnetic field in order to form nickel nanochains (NNC). More details were given in a previous publication [19].…”

Section: Methodsmentioning

confidence: 99%

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Magnetoelectric coupling in PVDF/Nano NaNbO₃/NanoNi composites: Influence of Ni particles aspect ratio

Martin

Dantras

Lonjon

et al. 2020

IEEE Trans. Dielect. Electr. Insul.

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In this work, three phase magnetoelectric nanocomposites are successfully prepared by solvent casting from α-PVDF. The extrinsic piezoelectric effect is insured by 20 vol% of NaNbO 3 ferroelectric nanoparticles prepared by the hydrothermal process. Nickel is chosen as the magnetic phase. In order to maintain insulation, electrical percolation is avoided by using nickel contents lower than the percolation threshold. Two different morphologies are employed: spherical nanoparticles (NiNPs) and nanochains (NNCs) with an aspect ratio of 80. NNCs are obtained by a polyol process under a magnetic field. Thin films of nanocomposites are processed by hot pressing. The real part of the dielectric permittivity (') of composites is governed by Maxwell-Wagner-Sillars polarization at the PVDF/Ni interfaces. An important increase of ' at low frequency is observed for PVDF/NaNbO 3 /NNCs composites; it favors the magnetoelectric coupling. Piezoelectric properties of composites are dependent upon mechanical modulus so that the most higher d 33 is obtained for PVDF / NaNbO 3 / NiNPs. Magnetoelectric coupling coefficient ( ME ) is determined from magnetoelectric intensity. PVDF / NaNbO 3 / NiNPs composites exhibit enhanced magnetoelectric coupling. The  ME coupling coefficient reaches 4.2V/(mOe). The magnetic properties are significantly improved by the NiNPs

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AC/DC Magnetic Field Sensing Utilizing Mechanically Mediated Product Effect of Ampere Force Caused by Eddy Currents and Piezoelectricity in a Magnetoelectric Disk

Zhang

Yao

et al. 2021

Physica Status Solidi (a)

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The last two decades have witnessed an ever‐increasing research effort devoted to the development and application of magnetoelectric (ME) sensing composites. Herein, the ME effect in a metallic/polymeric composite fabricated by adhering silver electrodes to two surfaces of one poly(vinylidine fluoride) (PVDF) disk is explored. To obtain obvious ME response, the resonance frequency of the experimental setup is measured. Furthermore, it is proved that the ME coupling in the composite (silver/PVDF/silver) originates from the product effect of the piezoelectric effect and ampere force produced by eddy currents under DC bias magnetic fields. By observing measurement results, the ME voltage is approximately considered to be proportional to both AC and DC magnetic fields. Consequently, the average ME voltage coefficient is obtained as 384.73 mV cm−1 Oe at a DC magnetic field value of 1000 Oe. Considering the magnetic fields and eddy current, a theoretical model of ME coupling is developed by combining the ampere force expression and piezoelectric equations, which matches well with measurement results. Without the need of magnetic phase and an external power supply, the proposed disk with excellent linear responses and a considerable ME voltage coefficient has the potential for application in real‐time monitoring sensors.

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Fabrication of Nickel NanoChains/PVDF Nanocomposites and Their Electrical/Magnetic Properties

Cited by 4 publications

References 42 publications

Nickel‐Decorated Silver Nanowires for Polymer‐Based Magnetoelectric Composite

Nickel‐Decorated Silver Nanowires for Polymer‐Based Magnetoelectric Composite

Magnetoelectric coupling in PVDF/Nano NaNbO₃/NanoNi composites: Influence of Ni particles aspect ratio

AC/DC Magnetic Field Sensing Utilizing Mechanically Mediated Product Effect of Ampere Force Caused by Eddy Currents and Piezoelectricity in a Magnetoelectric Disk

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Fabrication of Nickel NanoChains/PVDF Nanocomposites and Their Electrical/Magnetic Properties

Cited by 4 publications

References 42 publications

Nickel‐Decorated Silver Nanowires for Polymer‐Based Magnetoelectric Composite

Nickel‐Decorated Silver Nanowires for Polymer‐Based Magnetoelectric Composite

Magnetoelectric coupling in PVDF/Nano NaNbO3/NanoNi composites: Influence of Ni particles aspect ratio

AC/DC Magnetic Field Sensing Utilizing Mechanically Mediated Product Effect of Ampere Force Caused by Eddy Currents and Piezoelectricity in a Magnetoelectric Disk

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Magnetoelectric coupling in PVDF/Nano NaNbO₃/NanoNi composites: Influence of Ni particles aspect ratio