Microwave absorption properties and mechanism of cagelike ZnO∕SiO2 nanocomposites

Cao, Mao‐Sheng; Shi, Xiaoling; Fang, Xiao‐Yong; Jin, Haibo; Hou, Zhi‐Ling; Zhou, Wei; Chen, Yujin

doi:10.1063/1.2803764

Cited by 248 publications

(132 citation statements)

References 29 publications

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“…According to transmission line theory, the RL coefficient (in dB) of the electromagnetic wave (normal incidence) at the surface of a single-layer material backed by a perfect conductor at a given frequency and layer thickness can be defined by Equations (1) and (2): [22] Z…”

Section: Wave-absorption Propertiesmentioning

confidence: 99%

Synthesis and Growth Mechanism of White‐Fungus‐Like Nickel Sulfide Microspheres, and Their Application in Polymer Composites with Enhanced Microwave‐Absorption Properties

Lü

Wang

et al. 2014

ChemPlusChem

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White‐fungus‐like NiSx microspheres have been synthesized on a large scale by using a simple hydrothermal method. The influence of the reaction time and the surfactant on the final products was investigated, and the formation mechanism was discussed. The synthesized white‐fungus‐like NiSx microspheres were used firstly as fillers in the fabrication of NiSx/polyvinylidene fluoride (PVDF) composites. Relationships between the loadings of the NiSx and wave‐absorption properties of the composites were analyzed. The loss mechanisms of NiSx/PVDF with different loadings were also discussed according to their dielectric and magnetic behaviors.

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Section: Wave-absorption Propertiesmentioning

confidence: 99%

Synthesis and Growth Mechanism of White‐Fungus‐Like Nickel Sulfide Microspheres, and Their Application in Polymer Composites with Enhanced Microwave‐Absorption Properties

Lü

Wang

et al. 2014

ChemPlusChem

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“…The absence of catalysts and additives is considered as a further advantage of the process since the final products were free of residues from them that may affect the results of characterization. Based on our previous work [8,16,[25][26][27][28][29] , we have designed a new apparatus to prepare ZnO nanostructures with different morphologies. Their optical properties and growth mechanism of the ZnO nanostructures were studied.…”

mentioning

confidence: 99%

Preparation and properties of ZnO nano-whiskers

Shi

Cao

Zhao

et al. 2008

Sci. China Ser. E-Technol. Sci.

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By a novel controlled combustion synthesis method, a large amount of ZnO nanowhiskers with different morphologies like nanotetrapods, long-leg nanotetrapod and multipods, were prepared without any catalysts and additives in open air at high temperature. Their morphologies, structures and optical properties were investigated by using SEM, XRD and PL spectrum. The possible growth mechanisms on the ZnO nano-whiskers were proposed in this paper. ZnO, nano-whiskers, combustion synthesis methodDuring the last decade, the growth of low dimensional structures such as nanorods, nanowires, quantum dots and quantum wells has attracted considerable attention due to their unique and fascinating properties such as superior mechanical toughness [1] , higher luminescence [2] and lowered lasing threshold [3] . Among them, ZnO nanostructure [4][5][6][7] , as a wide-gap (3.37 eV) semiconductor oxide, becomes one of the most important functional materials with unique properties of near-UV emission, optical transparency, electric conductivity, and piezoelectricity due to its large exciton binding energy (~60 meV) [8] . Since Yoshinaka [9] reported on the preparation of nanotetrapod ZnO whiskers, various methods have been developed [9][10][11][12][13] to improve the preparations of ZnO nanowhiskers. For the decades, ZnO whiskers have been synthesized by various techniques such as chemical vapor transport and condensation (CVTC) [4,14,15] , thermal evaporation [5,16] , aqueous solution deposition [17] , template-based growth [18] , chemical vapor deposition with various types of Zn sources [19][20][21] , pulsed laser deposition [22,23] and sonochemical method [24] . In this paper, three kinds of ZnO nano-whiskers were successfully synthesized via combustion synthesis method without any catalysts or carrier gases. The absence of catalysts and additives is considered as a further advantage of the process since the final products were free of residues from them that may affect the results of characterization. Based on our previous work [8,16,[25][26][27][28][29] , we have designed a new apparatus to prepare ZnO nanostructures with different morphologies. Their optical properties and

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“…ZnO was randomly dispersed in the wax matrix, which could not connect with each other in the composites. Therefore, the incontinuous local microcurrent network in the composites was formed [14]. Each porous hollow ZnO will generate strong conductive loss, which leads to the attenuation of microwave energy.…”

Section: Resultsmentioning

confidence: 99%

“…It was shown that microwave absorption was affected by the electric resistivity, the aspect ratio and the contents of the whiskers [13]. Cao et al found that cage-like ZnO nanostructures exhibit relative strong microwave absorption in the X band, compared with ZnO nanoparticles [14]. The microwave absorption properties of the ZnO nanowirepolyester composites were also reported [15].…”

Section: Introductionmentioning

confidence: 92%