Preparation and Property of CoFe2O4 Nanofibers with Fishbone-like Structure

doi:10.15541/jim20190581

Abstract

Abstract:

CoFe₂O₄ nanofibers with fishbone-like structure were prepared by a electrospinning method followed with high temperature calcination, using polyvinylpyrrolidone (PVP), iron nitrate nonahydrate (Fe(NO₃)₃·9H₂O) and cobalt nitrate hexahydrate (Co(NO₃)₂·6H₂O) as raw materials. Results show that the crystallinity and grain size of nanofibers become larger with increasing calcination temperature. Meanwhile, the surface morphology of CoFe₂O₄ nanofibers changes from smooth to rough and porous. The morphology of CoFe₂O₄ nanofibers exhibits a fishbone-like structure with calcination temperature exceeding 800 ℃. The diameter of the fiber is gradually decreased with the increase of calcination temperature, and the average diameter of CoFe₂O₄ nanofibers calcined at 900 ℃ reaches 80.3 nm. By vibration sample magnetometer (VSM) test, the saturation magnetization (M_s) of CoFe₂O₄ nanofibers increases with the increase of calcination temperature, and the M_s of CoFe₂O₄ nanofibers calcined at 900 ℃ is 87.13 A·m²/kg. In a result of vector network analyzer (VNA) analysis, the microwave absorption performance is significantly different with calcination temperature changing. Among them the fibers calcined at 800 ℃ have the highest wave absorption ability. The microwave absorption mechanism of CoFe₂O₄ nanofibers mainly includes hysteresis loss and eddy current loss. The morphology of porous and fishbone-like generated by calcination can increase the reflection loss, for the reason that this morphology is beneficial for microwave reflection multiple times on the fiber surface.

Key words: electrospinning, CoFe₂O₄, nanofibers, magnetic performance, microwave absorption

CLC Number:

TQ343

ZHU Zhengwang,FENG Rui,LIU Yang,ZHANG Yang,XIE Wenhan,DONG Lijie. Preparation and Property of CoFe₂O₄ Nanofibers with Fishbone-like Structure[J]. Journal of Inorganic Materials, 2020, 35(9): 1011-1016.

Figures/Tables 10

Fig. 1 Experimental flow chart for preparation of CoFe2O4 nanofibers

Fig. 2 SEM images of precursor fiber (unsintered) (a) and CoFe2O4 nanofibers calcined at different temperatures (b-f)

Fig. 3 Average diameter of precursor fiber (unsintered) and CoFe2O4 nanofibers calcined at different temperatures

Fig. 4 XRD patterns of CoFe2O4 nanofibers calcined at different temperatures

Fig. 5 Average grain size of CoFe2O4 fibers calcined at different temperatures

Fig. 6 Infrared spectra of CoFe2O4 nanofibers and precursor fibers calcined at different temperatures

Fig. 7 TG curve of CoFe2O4 precursor fiber

Fig. 8 Hysteresis loops of CoFe2O4 nanofibers calcined at different temperatures

Fig. 9 Reflection loss curves of CoFe2O4 nanofibers calcined at different temperatures

Fig. 10 C0-f curves of CoFe2O4 nanofibers calcined at different temperatures

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Preparation and Property of CoFe₂O₄ Nanofibers with Fishbone-like Structure

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