Synthesis, characterization and electromagnetic performance of nanocomposites of graphene with α-LiFeO2 and β-LiFe5O8?

Journal of Materials Chemistry C Pub Date: 2015-04-27 DOI: 10.1039/C5TC00778J

Abstract

Face-centered cubic α-LiFeO2 and spinel β-LiFe5O8 with uniform size and high dispersion have been successfully assembled on 2D graphene sheets via a facile one-pot strategy under different reaction conditions. The reduction of GO by this method is effective and comparable to conventional methods, which was confirmed by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The structure of the products can be easily controlled by changing the solvent and reaction temperature. It was shown that the as-formed β-LiFe5O8 and α-LiFeO2 nanocrystals with a diameter of ca. 5 nm and 7 nm, respectively, were densely and uniformly anchored on the graphene sheets, and as a result, the aggregation of the nanoparticles was effectively prevented. The investigation of the microwave absorbability reveals that the α-LiFeO2–GN and β-LiFe5O8–GN nanocomposites exhibit excellent microwave absorbability, which is stronger than that of the corresponding α-LiFeO2 and β-LiFe5O8 nanostructures, respectively.

Graphical abstract: Synthesis, characterization and electromagnetic performance of nanocomposites of graphene with α-LiFeO2 and β-LiFe5O8
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