Microwave absorption behaviors of tetra-needle-like ZnO whiskers

Zhou, Zuowan; Chu, Longsheng; Hu, Shuchun

doi:10.1016/j.mseb.2005.09.009

Cited by 110 publications

(58 citation statements)

References 8 publications

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“…Such wide absorption widths and high absorption loss peaks indicate that it has wide application as microwave absorbing material. This may be due to the reason that the inhomogeneous growth of particles creates the suitable size of network's holes as reported by Zhou et al [26] where the author has described about these network's holes created due to increase in the aspect ratio. The larger the standard deviation, the larger will be the size of pores in the composite, which leads to more internal reflection and as a result less direct reflection on the surface of the material.…”

Section: Reflection Loss Studymentioning

confidence: 85%

EFFECT OF PARTICLE SIZE OF BaFe12O19 ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

Kumar¹,

Agarwala²,

Singh³

2013

PIER M

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Abstract-Present work deals with the microwave absorption characteristics of BaFe 12 O 19 of interest as radar absorbing material (RAM). There are very few reported works available where particle size has been critically analyzed for absorbing characteristics at microwave frequencies, therefore, in this paper microwave absorption properties of the BaFe 12 O 19 with different particle sizes were investigated. The results showed that the particle size had significant influence on the dielectric and absorption properties of the composites in the 8.2-12.4 GHz frequency range. BaFe 12 O 19 powder of different particle sizes were synthesized by varying the annealing time and it was observed that the real part of permittivity of the composite increases from 5.18 (average value) to 7.50 (average value) and imaginary part increases from an average value of 0.20 to an average value of 2.33, whereas the real part of permeability increases from 0.95 (average value) to 1.11 (average value) and imaginary part of permeability was measured in the range of 0.02 to 0.07. These changes in permittivity and permeability affects microwave absorption application. It is observed that the maximum bandwidth for average particle size of 240 nm is 3.02 GHz and with the increase in average particle size, microwave absorption properties increased.

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Section: Reflection Loss Studymentioning

confidence: 85%

EFFECT OF PARTICLE SIZE OF BaFe12O19 ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

Kumar¹,

Agarwala²,

Singh³

2013

PIER M

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“…According to the transmission line theory, RL can be calculated by the following equations 6,8,[30][31][32][33] :…”

Section: Microwave Absorption Propertiesmentioning

confidence: 99%

“…[1][2][3] In the past decades, extensive e®orts have been made to develop EM wave absorption materials that meet the requirements of strong absorption, wide frequency band, thin thickness and light weight. [4][5][6][7][8] Zinc oxide (ZnO) is one of the most important n-type semiconductor with a wide bandgap of 3.37 eV at room temperature. 9,10 It exhibits many excellent properties, such as good chemical stability, low cost, high optical transparency and electrical conductivity, which made it become an attractive material for application in optoelectronic devices, 11 catalysis 12 and gas-sensing.…”

Section: Introductionmentioning

confidence: 99%

“…13 Recently, ZnO has attracted signi¯cant attention owing to its remarkable microwave absorption properties. [4][5][6] In order to further improve the microwave absorption performance of ZnO, scientists have made much e®orts and their interest is mainly focused on the two aspects. On the one hand, ZnO with unique microstructure is fabricated, such as tetra-needlelike ZnO whiskers, 6 ZnO nanorods, 9 ZnO nanotrees, 14 ZnO dendritic nanostructures, 15 nanoneedlelike ZnO, 16 crossed ZnO netlike micro-/nanostructures, 17 etc.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6] In order to further improve the microwave absorption performance of ZnO, scientists have made much e®orts and their interest is mainly focused on the two aspects. On the one hand, ZnO with unique microstructure is fabricated, such as tetra-needlelike ZnO whiskers, 6 ZnO nanorods, 9 ZnO nanotrees, 14 ZnO dendritic nanostructures, 15 nanoneedlelike ZnO, 16 crossed ZnO netlike micro-/nanostructures, 17 etc. For example, Liu et al fabricated nanoneedlelike ZnO via a facile combustion synthesis route and the materials exhibited enhanced permittivity and multi-region microwave absorption in the X-band at elevated temperature and the minimum re°ection loss (RL min ) reached À44 dB.…”

Section: Introductionmentioning

confidence: 99%

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Coprecipitation Synthesis of Fe-doped ZnO Powders with Enhanced Microwave Absorption Properties

Shu

Wang

Yang

et al. 2016

NANO

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In this work, the Fe-doped ZnO powders have been synthesized by a facile chemical coprecipitation method. The structure, morphology and magnetic properties of the as-prepared powders were characterized by X-ray di®raction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrum (EDS), X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer (VSM). The results showed that the Fe ions were well incorporated into the crystal lattice of ZnO and had a valence state of þ3. The magnetization curves indicated the Fe-doped ZnO presented the ferromagnetic behavior at room temperature. Moreover, the electromagnetic (EM) parameters and microwave absorption properties of Fe-doped ZnO/para±n wax in the frequency range of 2-18 GHz were explored. The minimum re°ection loss reached À38:4 dB at 6.6 GHz, and the re°ection loss less than À10:0 dB was 4.0 GHz (from 11.0 GHz to 15.0 GHz) with a thickness of only 2.5 mm. Signi¯cantly, the enhanced microwave absorption of the as-prepared powders could be achieved by doping with Fe 3þ ions or varying the thickness of the absorbers. The mechanism of microwave absorption were attributed to the good impedance matching, the dielectric loss resulted from the crystal lattice defects and the magnetic loss originated from the natural resonance. It is believed that the Fe-doped ZnO powders could be used as potential microwave absorbers.

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Dimensional Design and Core–Shell Engineering of Nanomaterials for Electromagnetic Wave Absorption

et al. 2022

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Herein, the advances in low-dimensional core-shell EM wave absorption materials are outlined and a selection of the most remarkable examples is discussed. The derived key information regarding dimensional design, structural engineering, performance, and structure-function relationship are comprehensively summarized. Moreover, the investigation of the cuttingedge mechanisms is given particular attention. Additional applications, such as oxidation resistance and self-cleaning functions, are also introduced. Finally, insight into what may be expected from this rapidly expanding field and future challenges are presented.

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Microwave absorption behaviors of tetra-needle-like ZnO whiskers

Cited by 110 publications

References 8 publications

EFFECT OF PARTICLE SIZE OF BaFe<sub>12</sub>O<sub>19</sub> ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

EFFECT OF PARTICLE SIZE OF BaFe<sub>12</sub>O<sub>19</sub> ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

Coprecipitation Synthesis of Fe-doped ZnO Powders with Enhanced Microwave Absorption Properties

Dimensional Design and Core–Shell Engineering of Nanomaterials for Electromagnetic Wave Absorption

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