Electrospinning Fabrication and Microwave Absorption Properties of Lithium Zinc Ferrite Micro/Nanofibers

doi:10.7503/cjcu20160846

Abstract

Abstract:

Spinel-type Li_0.35Zn_0.3Fe_2.35O₄ micro/nanofibers were prepared through electrospinning and calcination technique. The crystalline phase and micromorphology of the samples calcined at various temperatures(700, 800, 900 and 1000 ℃) for 2 h in air were examined by differential scanning calorimetry(DSC)-thermalgravimetric analysis(TGA), Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM). Microwave absorption properties of Li_0.35Zn_0.3Fe_2.35O₄ micro/nanofibers were determined with a vector network analyzer. The results showed that pure spinel structure formed at 700 ℃ and above. As the temperature increased, Li_0.35Zn_0.3Fe_2.35O₄ exhibited micro/nanofibrous, 3D network, bamboo-like or granular morphology. The minimum reflectivity of Li_0.35Zn_0.3Fe_2.35O₄ micro/nanofibers at 700 ℃ moved to a low frequency as the matching thickness increased. The matching thickness of Li_0.35Zn_0.3Fe_2.35O₄ micro/nanofibers was 6 mm below 8 GHz, at which the microwave absorption properties were fine. The minimum reflectivity could reach -26 dB at 5.0 GHz, and the frequency band with reflectivity less than -10 dB was 4.0—8.0 GHz.

Key words: Li_0.35Zn_0.3Fe_2.35O₄, Calcination temperature, Morphology, Micro/nanofibers, Microwave absorption property

CLC Number:

O614

TrendMD:

ZHAO Fang, WANG Jianjiang, XU Baocai, LIU Jiawei, GAO Haitao. Electrospinning Fabrication and Microwave Absorption Properties of Lithium Zinc Ferrite Micro/Nanofibers[J]. Chem. J. Chinese Universities, 2017, 38(6): 922.

Figures/Tables 7

Fig.1 DSC-TGA curves of Li0.35Zn0.3Fe2.35O4/PVP composite fibers

Fig.2 XRD patterns of Li0.35Zn0.3Fe2.35O4 calcined at different temperatures a. No calcination; b—d. calcined at 700, 800, 900 and 1000 ℃, respectively.

Fig.3 FTIR spectrum of Li0.35Zn0.3Fe2.35O4 micro/nanofibers calcined at 700 ℃

Fig.4 FESEM image of Li0.35Zn0.3Fe2.35O4/PVP composite fibers

Fig.5 FESEM images of Li0.35Zn0.3Fe2.35O4 calcined at 700 ℃(A), 800 ℃(B), 900 ℃(C) and 1000 ℃(D)

Fig.6 Permittivity(A) and permeability(B) of Li0.35Zn0.3Fe2.35O4 micro/nanofibers

Fig.7 Reflectivity of Li0.35Zn0.3Fe2.35O4 micro/nanofibers at different thicknesses Thickness/mm: a. 4; b. 5; c. 6; d. 7.

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