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Issue 14, 2018
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Controllable synthesis, formation mechanism, and enhanced microwave absorption of dendritic AgFe alloy/Fe3O4 nanocomposites

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Abstract

Single-crystalline dendritic AgFe alloy/Fe3O4 nanocomposites were successfully synthesized through galvanic replacement using Fe nanofibers as reducers and templates. The molar ratio of Ag+/Fe2+ (δ) and the aspect ratio of Fe nanofibers influence the compositions and sizes of the nanocomposites, respectively. The selective attachment at the {220} planes and anisotropic growth along the (111) plane affect the growth of dendritic nanocomposites. The composition-dependent static magnetic and microwave electromagnetic characteristics were studied systematically. Dendritic nanocomposites are typically ferromagnetic. The Ms decreases and Hc increases with increasing δ because of the increased content of antiferromagnetic Ag. Nanocomposites with δ = 1 : 1 and 2 : 1 exhibit significantly stronger absorption, thinner sample thickness, and lower bandwidth than pure Ag nanoparticles because of enhanced dielectric loss, magnetic loss, resonance absorption, and impedance matching. The bandwidth (RL ≤ −10 dB) is 4.85 GHz, which corresponds to the minimum RL value of −43.5 dB, and the absorption frequency range (RL ≤ −20 dB) is 7.68 GHz. This work provides a general strategy for preparing dendritic Ag-based nanocomposites and a basis for further studies on using hierarchical heterostructures as microwave-absorbing materials.

Graphical abstract: Controllable synthesis, formation mechanism, and enhanced microwave absorption of dendritic AgFe alloy/Fe3O4 nanocomposites

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Publication details

The article was received on 25 Dec 2017, accepted on 16 Feb 2018 and first published on 19 Feb 2018


Article type: Paper
DOI: 10.1039/C7CE02223A
Citation: CrystEngComm, 2018,20, 1997-2009
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    Controllable synthesis, formation mechanism, and enhanced microwave absorption of dendritic AgFe alloy/Fe3O4 nanocomposites

    C. Jin, Z. He, Y. Zhao, Y. Pan, W. Wu, X. Wang and G. Tong, CrystEngComm, 2018, 20, 1997
    DOI: 10.1039/C7CE02223A

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