Morphology-dominant microwave absorption enhancement and electron tomography characterization of CoO self-assembly 3D nano-flowers

Li, Ying; Zhang, Jie; Liu, Zhengwang; Liu, Mengmei; Lin, Hong‐Ji; Che, Renchao

doi:10.1039/c4tc00739e

Cited by 58 publications

(35 citation statements)

References 32 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The amount of nanoparticles in the paraffin-bonded composite is usually in the 30%-60%. In order to prove the present system as a lightweight and thin microwave absorber, the amount of nanoparticles is established to be 25 wt%.…”

Section: Materials Characterizationsmentioning

confidence: 99%

Ultrasmall superparamagnetic Ni nanoparticles embedded in polyaniline as a lightweight and thin microwave absorber

Han

Xiao

et al. 2015

RSC Adv.

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In this work, we have reported the preparation and lightweight and thin microwave absorbent application of ultrasmall Ni nanoparticles embedded in polyaniline (PANI). Ni nanoparticles have the average diameter of 2.1 nm, and are in the form of single crystals and possess a single magnetic domain structure. The blocking temperature of the Ni@PANI nanocomposite is established to be 52 K. The Ni@PANI nanocomposite is in a superparamagnetic state at 300 K. The optimal reflection loss value of a paraffin-bonded composite with 25 wt% of Ni@PANI nanocomposite reaches À22.98 dB at 17.8 GHz for a thickness of 1.0 mm.Compared with the represented Ni-based nanocomposites, Ni@PANI nanocomposites possess favorable properties at lower density and thinner thickness, resulting from the combined effect of magnetic loss and dielectric loss by introducing ultrasmall superparamagnetic Ni nanoparticles into the PANI matrix.

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Section: Materials Characterizationsmentioning

confidence: 99%

Ultrasmall superparamagnetic Ni nanoparticles embedded in polyaniline as a lightweight and thin microwave absorber

Han

Xiao

et al. 2015

RSC Adv.

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“…[1][2][3][4][5] EMI not only impedes the functionality of electronic devices but also harms humans. Thus, in order to deal with this issue, considerable attention has been paid to the design and development of highly efficient EM wave absorbing materials, [6][7][8] which can absorb microwaves effectively and convert EM energy into thermal energy or dissipate microwaves.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis and enhanced microwave absorption properties of novel hierarchical heterostructures based on a Ni microsphere–CuO nano-rice core–shell composite

Zhao

Shao

Fan

et al. 2015

Phys. Chem. Chem. Phys.

109

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A novel hierarchical heterostructure of Ni microspheres-CuO nano-rices was fabricated using a simple two-step process. The CuO rices were densely deposited on the surfaces of Ni microspheres. The phase purity, morphology, and structure of composite heterostructures are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). Different structured Ni-CuO composite heterostructures are also investigated by adjusting the volume ratio of the reactants. The core-shell rice-like CuO-coated Ni exhibits better antioxidation capability than pure Ni due to the presence of the barrier effect of the CuO shell, which is revealed by the thermogravimetric analysis (TGA). In comparison with pristine Ni microspheres and CuO nanoflakes, the Ni-CuO composites exhibit excellent microwave absorption properties. Moreover, the amount of CuO plays a vital role in the microwave attenuation of Ni-CuO composites. The Ni-CuO heterostructures prepared at 0.017 M Cu(2+) exhibit the best electromagnetic wave absorption capabilities. A minimum reflection loss reaches -62.2 dB (>99.9999% microwave absorption) at 13.8 GHz with the thickness of only 1.7 mm. The effective absorption (below -10 dB) bandwidth can be tuned between 6.4 GHz and 18.0 GHz by tuning the absorber thickness of 1.3-3.0 mm. Thus, the Ni-CuO composite possesses a fascinating microwave absorption performance as a novel absorbing material with strong absorption, wide-band gap and thin thickness.

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“…[1] Numerous efforts have been devoted to fulfillingt he harsh requirements of these absorbers by exploring new materials with designedc ompositions andn anostructures. [2] Transition metal oxides( TMO), such as Fe 2 O 3 , [3] Co 3 O 4 , [4] CoO, [5] NiO, [6] and TiO 2 [7] have been developed as effective EM wave absorbersd ue to their excellent chemical stability,l arge specific surface area, and abundanti ntrinsic defects, which can induce interfacial and dipole polarization for enhanced wave attenuation.V anadium oxides, at ype of earth-abundant and inexpensive TMO, have drawn great interestd ue to their exciting behavioro na ccount of their optical, [8] electrical, [9] and magnetic properties. [10] Among the various vanadium oxides, vanadium sesquioxide (V 2 O 3 )e xhibits metallicc haracteristics with relativelyh igh electrical conductivity at room temperature, since the V3de lectrons can itinerate along the V-V chains.…”

Section: Introductionmentioning

confidence: 99%

Metal‐Organic Framework Derived Hierarchical Co/C@V₂O₃ Hollow Spheres as a Thin, Lightweight, and High‐Efficiency Electromagnetic Wave Absorber

Zhou

Liu

et al. 2019

Chemistry A European J

102

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Developing high‐efficiency electromagnetic (EM) wave absorbing materials with light weight, thin thickness, and wide absorption bandwidth is highly desirable for ever‐developing electronic and telecommunication devices. Herein, hierarchical metal–organic framework (MOF)‐derived Co/C@V2O3 hollow spheres were designed and synthesized through a facile hydrothermal, precipitation, and pyrolysis method. The composite exhibits both excellent impedance matching and light weight due to the rational combination of hollow V2O3 spheres and porous Co/C. Additionally, multiple components enable a large dielectric and magnetic loss of the composite, giving rise to enhanced EM wave absorption performance with a maximum reflection loss (RL) of −40.1 dB and a broad effective absorption bandwidth (RL < −10 dB) of 4.64 GHz at a small thickness of 1.5 mm. This work provides insights into the design of hierarchical hollow and porous composites as thin and lightweight EM wave absorbers with efficient absorption, which can also be extended to energy storage, catalysis, and sensing.

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Morphology-dominant microwave absorption enhancement and electron tomography characterization of CoO self-assembly 3D nano-flowers

Cited by 58 publications

References 32 publications

Ultrasmall superparamagnetic Ni nanoparticles embedded in polyaniline as a lightweight and thin microwave absorber

Ultrasmall superparamagnetic Ni nanoparticles embedded in polyaniline as a lightweight and thin microwave absorber

Facile synthesis and enhanced microwave absorption properties of novel hierarchical heterostructures based on a Ni microsphere–CuO nano-rice core–shell composite

Metal‐Organic Framework Derived Hierarchical Co/C@V₂O₃ Hollow Spheres as a Thin, Lightweight, and High‐Efficiency Electromagnetic Wave Absorber

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Morphology-dominant microwave absorption enhancement and electron tomography characterization of CoO self-assembly 3D nano-flowers

Cited by 58 publications

References 32 publications

Ultrasmall superparamagnetic Ni nanoparticles embedded in polyaniline as a lightweight and thin microwave absorber

Ultrasmall superparamagnetic Ni nanoparticles embedded in polyaniline as a lightweight and thin microwave absorber

Facile synthesis and enhanced microwave absorption properties of novel hierarchical heterostructures based on a Ni microsphere–CuO nano-rice core–shell composite

Metal‐Organic Framework Derived Hierarchical Co/C@V2O3 Hollow Spheres as a Thin, Lightweight, and High‐Efficiency Electromagnetic Wave Absorber

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Product

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Metal‐Organic Framework Derived Hierarchical Co/C@V₂O₃ Hollow Spheres as a Thin, Lightweight, and High‐Efficiency Electromagnetic Wave Absorber