Scalable Preparation and Microwave Absorption of Lightweight Fe3O4/Mesoporous Carbon Microsphere Composites

doi:10.15541/jim20160689

Abstract

Abstract:

Fe₃O₄/mesoporous carbon microspheres (MCMSs) composites were prepared by a facile wet-impregnation method using spray-drying produced MCMSs as carbon substrates. The structure, morphology and microwave absorbing performance were investigated. Results indicate that the composites have good fluidity and low bulk density of 0.24- 0.33 g/m³. The Fe₃O₄nanoparticles are homogeneously dispersed in the mesoporous channels without blocking the porosity of MCMSs. The resulting Fe₃O₄/MCMSs composites have very high BET surface areas of 548-735 m²/g, which promote multiple relaxations. In the frequency range of 2-18 GHz, the microwave loss is primarily derived from dielectric loss. The composite with 40wt% Fe₃O₄ exhibits a maximum reflection loss of -25 dB at 12.6 GHz and a broad absorption band over 4.7 GHz. Such good microwave electromagnetic performances can be ascribed to the synergistic effects of highly dispersed Fe₃O₄nanoparticles and mesoporous channels, which can increase interfacial relaxation and microwave diffraction as well as reduce the reflection of microwave at the interface between air and absorber.

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Key words: composites, mesoporous carbon microspheres, ferrites, microwave absorption properties

CLC Number:

TM25

LIU Ke, WANG Ji-Tong, LONG Dong-Hui, LING Li-Cheng. Scalable Preparation and Microwave Absorption of Lightweight Fe₃O₄/Mesoporous Carbon Microsphere Composites[J]. Journal of Inorganic Materials, 2017, 32(10): 1023-1028.

Figures/Tables 7

Fig. 1 (a) TG curves and (b) XRD patterns of Fe3O4/MCMSs composites

Fig. 2 (a) SEM , (b), (c) TEM and (e)-(f) SEM mapping images of 40%-Fe3O4-MCMSs

Fig. 3 (a) Nitrogen adsorption-desorption isotherms and (b) BJH pore size distributions of MCMSs and Fe3O4/MCMSs composites

Table 1 Structure parameters of MCMSs and Fe3O4/MCMSs magnetic composites

Sample	S_BET^a/ (m²·g^-1)	V_total^b/ (cm³·g^-1)	Pore size /nm	Tap density /(g·m^-3)
MCMSs	1221	2.4	8.1	0.18
20%-Fe₃O₄-MCMSs	735	1.8	8.1	0.24
40%-Fe₃O₄-MCMSs	548	1.1	8.1	0.33

Fig. 4 Magnetic hysteresis loops at room temperature of Fe3O4/MCMSs composites. Inset is low field hysteresis curves

Fig. 5 Permittivity, permeability and loss tangent of MCMSs and Fe3O4/MCMSs composites

Fig.6 RL curves of (a) MCMSs, (b)20%-Fe3O4-MCMSs and (c) 40%-Fe3O4-MCMSs at different thickness (1-5 nm)

References 22

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Scalable Preparation and Microwave Absorption of Lightweight Fe₃O₄/Mesoporous Carbon Microsphere Composites

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