Effects of particle size on the magnetic and microwave absorption properties of carbon-coated nickel nanocapsules

Wu, Niandu; Liu, Xianguo; Zhao, Chengyun; Cui, Caiyun; Xia, Ailin

doi:10.1016/j.jallcom.2015.10.027

Cited by 214 publications

(82 citation statements)

References 33 publications

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“…1,8 A Ni ingot of 99.9% purity was placed in a water-cooled copper crucible as the anode, while a tungsten needle of 5 mm diameter was employed as the cathode. After evacuating the arc-discharge chamber to 5 mPa, ethanol of 40 ml was introduced into the chamber as the C source.…”

Section: Methodsmentioning

confidence: 99%

“…1 High-performance EM absorbers, featuring simultaneously strong absorption, wide absorption bandwidth, small thickness, and low density in the gigahertz microwave range, have become increasingly important and demanding. [2][3][4] Core/shell-structured nanocapsules, comprising a magnetic nanoparticle core and a dielectric shell of nanometer size, have attracted considerable attention because of their synergetic effects between dielectric and magnetic losses for absorbing EM waves.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] Core/shell-structured nanocapsules, comprising a magnetic nanoparticle core and a dielectric shell of nanometer size, have attracted considerable attention because of their synergetic effects between dielectric and magnetic losses for absorbing EM waves. [1][2][3][4][5][6][7] Among various types of core/shell-structured nanocapsules, nickel/carbon (Ni/C) nanocapsules are regarded as a highpotential candidate due to their simple material type, simple preparation process, interesting dielectric and magnetic properties, good EM impedance match, and high EM absorption properties, etc. 1,2,6 For instance, a Ni/C nanocapsule absorber with 2.0 mm thickness exhibits a large reflection loss (RL) of ∼-32 dB at ∼13 GHz and a wide effective absorption bandwidth (for RL<-10 dB) of ∼4.3 GHz (i.e.,11.2-15.5 GHz).…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] Among various types of core/shell-structured nanocapsules, nickel/carbon (Ni/C) nanocapsules are regarded as a highpotential candidate due to their simple material type, simple preparation process, interesting dielectric and magnetic properties, good EM impedance match, and high EM absorption properties, etc. 1,2,6 For instance, a Ni/C nanocapsule absorber with 2.0 mm thickness exhibits a large reflection loss (RL) of ∼-32 dB at ∼13 GHz and a wide effective absorption bandwidth (for RL<-10 dB) of ∼4.3 GHz (i.e.,11.2-15.5 GHz). 6 However, the major obstacle to widespread use of the core/shell-structured nanocapsules in EM absorbers is their almost untunable EM absorption properties constrained by the a Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…Electronic mail: eeswor@polyu.edu.hk limited material phase variety in the single core/shell structure. 1 In fact, once the material phases are fixed for the core and the shell in such a nanocapsule (e.g., Ni/C nanocapsule), its EM absorption properties are unable to be further tuned. Semiconductor materials are known to have complex and rich electronic transport properties.…”

Section: Introductionmentioning

confidence: 99%

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Ag3PO4 nanoparticle-decorated Ni/C nanocapsules with tunable electromagnetic absorption properties

et al. 2017

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Core/shell-structured nickel/carbon (Ni/C) nanocapsules with Ag3PO4 nanoparticle decoration (Ag3PO4@Ni/C) are prepared by an arc-discharge process and an ion-exchange process. The Ag3PO4@Ni/C nanocapsules show a clear decoration of Ag3PO4 nanoparticles of 4–20 nm diameter on the C shell of the Ni/C nanocapsules of ∼60 nm diameter. The amount of Ag3PO4 nanoparticles that can be decorated on the Ni/C nanocapsules depends on the volume of Na2HPO4 reactant used in the ion-exchange process. The Ag3PO4@Ni/C nanocapsules demonstrate interestingly high and tunable electromagnetic absorption properties with different amounts of Ag3PO4 nanoparticle decoration in the paraffin-bonded composites over the 2–18 GHz microwave range. The nanocapsules prepared with 100 ml Na2HPO4 exhibit much enhanced dielectric and magnetic losses for an improved electromagnetic impedance match. These result in a large reflection loss (RL) of -31.4 dB at 12.3 GHz for a small absorber thickness of 2.6 mm in conjunction with a very wide effective absorption bandwidth (for RL<-10 dB) of 14 GHz (4–18 GHz) at a wide absorber thickness range of 1.4–5.0 mm.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ag3PO4 nanoparticle-decorated Ni/C nanocapsules with tunable electromagnetic absorption properties

et al. 2017

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Galvanically Replaced, Single‐Bodied Lithium‐Ion Battery Fabric Electrodes

Woo

Yoo

Lim

et al. 2020

Adv Funct Materials

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Despite extensive research on flexible/wearable power sources, their structural stability and electrochemical reliability upon mechanical deformation and charge/discharge cycling have not yet been completely achieved. A new class of galvanically replaced single-bodied lithium-ion battery (LIB) fabric electrodes is demonstrated. As a proof of concept, metallic tin (Sn) is chosen as an electrode active material. Mechanically compliable polyethyleneterephthalate (PET) fabrics are conformally coated with thin metallic nickel (Ni) layers via electroless plating to develop flexible current collectors. Driven by the electrochemical potential difference between Ni and Sn, the thin Ni layers are galvanically replaced with Sn, resulting in the fabrication of a single-bodied Sn@Ni fabric electrode (Sn is monolithically embedded in the Ni matrix on the PET fabric). Benefiting from the chemical/structural uniqueness and rationally designed bicontinuous ion/electron transport pathways, the single-bodied Sn@Ni fabric electrode provides exceptional redox reaction kinetics and omnidirectional deformability (notably, origami-folding boats), which lie far beyond those attainable with conventional LIB electrode technologies.

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Broadband Electromagnetic Properties of Engineered Flexible Absorber Materials

Suriyasena Liyanage,

Smith,

Pawlik

et al. 2023

Adv Materials Technologies

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Flexible and stretchable materials have attracted significant interest in wearable electronics and bioengineering fields. Recent developments also incorporate embedded microwave circuits and systems with engineered flexible materials that operate over a broad frequency range (≈1–100 GHz). Herein, a simple flip‐chip technique is used to evaluate frequency‐dependent electromagnetic properties of flexible materials and applied to evaluate engineered microwave absorbers based on self‐biased barium hexaferrite composites. On‐wafer error correction and de‐embedding techniques are applied to determine broadband electromagnetic properties of the material‐loaded transmission lines by placing the materials on top of coplanar waveguide transmission lines. Finite‐element simulations along with broadband measurements were employed to estimate the electromagnetic material properties. To demonstrate, flexible polydimethylsiloxane (PDMS) composites are fabricated with barium hexaferrite nanoparticles and complex permittivity and permeability of the composites are quantified under zero magnetic field bias up to 110 GHz. Frequency‐dependent composite permeability is fitted to models describing the ferromagnetic resonance of the self‐biased barium hexaferrite nanoparticles in polydimethylsiloxane, and constituent nanoparticle properties are estimated using the Maxwell–Garnett mixing model. This study paves the way to exploit a wide range of engineered materials in flexible, wearable, and biomedical electronics applications and presents a convenient methodology to extract important broadband electromagnetic properties of nanoparticles for customized electromagnetic applications.

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Effects of particle size on the magnetic and microwave absorption properties of carbon-coated nickel nanocapsules

Cited by 214 publications

References 33 publications

Ag3PO4 nanoparticle-decorated Ni/C nanocapsules with tunable electromagnetic absorption properties

Ag3PO4 nanoparticle-decorated Ni/C nanocapsules with tunable electromagnetic absorption properties

Galvanically Replaced, Single‐Bodied Lithium‐Ion Battery Fabric Electrodes

Broadband Electromagnetic Properties of Engineered Flexible Absorber Materials

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