Coaxial multi-interface hollow Ni-Al2O3-ZnO nanowires tailored by atomic layer deposition for selective-frequency absorptions

Yan, Lili; Liu, Jia; Zhao, Shichao; Zhang, Bin; Gao, Zhe; Ge, Huibin; Chen, Yao; Cao, Mao‐Sheng; Qin, Yong

doi:10.1007/s12274-016-1302-8

Cited by 85 publications

(38 citation statements)

References 63 publications

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“…According to Fig. 8(f), these two peaks are characteristic of the standard magnetic resonance spectrum, which may be indexed to the natural resonance and exchange resonance, respectively [48]. Moreover, the eddy current loss also contributes to microwave attenuation because of the approximately constant values of μ″ (μ′) −2 f −1 in the range of 14-18 GHz, as shown in Fig.…”

Section: Resultsmentioning

confidence: 92%

Confinedly implanted NiFe2O4-rGO: Cluster tailoring and highly tunable electromagnetic properties for selective-frequency microwave absorption

2018

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Lightweight and high-efficiency microwave absorption materials with tunable electromagnetic properties is a highly sought-after goal and a great challenge for researchers. In this work, a simple strategy of confinedly implanting small NiFe 2 O 4 clusters on reduced graphene oxide is demonstrated, wherein the magnetic clusters are tailored, and more significantly, the electromagnetic properties are highly tuned. The microwave absorption was efficiently optimized yielding a maximum reflection loss of-58 dB and ~ 12 times broadening of the bandwidth (at-10 dB). Furthermore, tailoring of the implanted magnetic clusters successfully realized the selective-frequency microwave absorption, and the absorption peak could shift from 4.6 to 16 GHz covering 72% of the measured frequency range. The fascinating performances eventuate from the appropriately tailored clusters, which provide optimal synergistic effects of the dielectric and magnetic loss caused by multi-relaxation, conductance, and resonances. These findings open new avenues for designing microwave absorption materials in future, and the well-tailored NiFe 2 O 4-rGO can be readily applied as a multi-functional microwave absorption material in various fields ranging from civil and commerce to military and aerospace.

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Section: Resultsmentioning

confidence: 92%

Confinedly implanted NiFe2O4-rGO: Cluster tailoring and highly tunable electromagnetic properties for selective-frequency microwave absorption

2018

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“…This can be attributed to enhanced polarization loss and higher hopper conductivity due to enhanced filler interactions [29,30]. The 5% M25/PLA and 5% M15/PLA samples exhibit slightly decreasing ε’’ with increasing frequency, but the 5% C750/PLA displays a distinct relaxation peak [31].…”

Section: Resultsmentioning

confidence: 99%

Comparison of Experimental and Modeled EMI Shielding Properties of Periodic Porous xGNP/PLA Composites

2019

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Microwave absorbing materials, particularly ones that can achieve high electromagnetic interference (EMI) absorption while minimizing weight and thickness are in high demand for many applications. Herein we present an approach that relies on the introduction of periodically placed air-filled pores into polymer composites in order to reduce material requirements and maximize microwave absorption. In this study, graphene nano platelet (xGNP)/poly-lactic acid (PLA) composites with different aspect ratio fillers were characterized and their complex electromagnetic properties were extracted. Using these materials, we fabricated non-perfect electrical conductor (PEC) backed, porous composites and explored the effect of filler aspect ratio and pore geometry on EMI shielding properties. Furthermore, we developed and experimentally verified a computational model that allows for rigorous, high-throughput optimization of absorbers with periodic porous geometries. Finally, we extend the modeling approach to explore the effect of pore addition on PEC-backed composites. Our composite structures demonstrated decreased fractions of reflected power and increased fractions of absorbed power over the majority of the X Band due to the addition of periodically arranged cylindrical pores. Furthermore, we showed that for xGNP/PLA composite material, reflection loss can be increased by as much as 13 dB through the addition of spherical pores. The ability to adjust shielding properties through the fabrication of polymer composites with periodically arranged pores opens new strategies for the modeling and development of new microwave absorption materials.

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“…(e)~(h) 镍包覆的玄武岩 [30] . (e) 合成过程示意图; [31] Figure 2 (Color online) Microwave absorption materials with non-classical core-shell structures. (a)-(d) Fe encapsulated within carbon nanotubes [29] .…”

Section: 广义的核壳结构并不局限于球状结构还有诸mentioning

confidence: 99%

“…(e) Schematic illustration of fabrication for basalt fiber@nickel core-shell; (f), (g) SEM images of typical basalt fibers@nickel samples; (h) reflection loss of basalt fibers@nickel. Schematic illustration of the formation process (i) and electromagnetic loss (j) of Ni-Al 2 O 3 -ZnO nanowires [31] 性能得到了显著的提升. 这种性能提升与复介电常数和复磁导率都有关系, 而作为壳层的碳纳米管的形状也会对Fe的磁化环境产生灵敏的影响.…”

Section: 广义的核壳结构并不局限于球状结构还有诸mentioning

confidence: 99%

“…这种性能提升与复介电常数和复磁导率都有关系, 而作为壳层的碳纳米管的形状也会对Fe的磁化环境产生灵敏的影响. 非球状的核壳结构, 还有一类较为常见的方式, 就是在纤维外部通过镀层的方式生长其他壳层材料, 比如玄武岩显微外层通过化学方法镀上一层镍(图2(e)~(h)) [30] , [31] , 就是一种性能优异的可调频吸收剂.…”

Section: 广义的核壳结构并不局限于球状结构还有诸unclassified

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Progress on microwave absorption materials with core-shell structure

Yang¹,

You²,

Qiu³

et al. 2018

Chin. Sci. Bull.

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Coaxial multi-interface hollow Ni-Al2O3-ZnO nanowires tailored by atomic layer deposition for selective-frequency absorptions

Cited by 85 publications

References 63 publications

Confinedly implanted NiFe2O4-rGO: Cluster tailoring and highly tunable electromagnetic properties for selective-frequency microwave absorption

Confinedly implanted NiFe2O4-rGO: Cluster tailoring and highly tunable electromagnetic properties for selective-frequency microwave absorption

Comparison of Experimental and Modeled EMI Shielding Properties of Periodic Porous xGNP/PLA Composites

Progress on microwave absorption materials with core-shell structure

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