Abstract
With the aim of achieving high microwave absorption and electromagnetic shielding performance, reduced graphene oxide (rGO) and Fe3O4@SiO2 nanochains are successfully combined at various mass ratios. By selecting the right mass ratio, an rGO/Fe3O4@SiO2 composite with excellent microwave absorption properties is obtained, and, due to the addition of highly conductive rGO, the desired shielding effectiveness is also achieved. The reflection loss (RL) value of the composite can reach −48.34 dB with a mass ratio of 1:1, and the effective bandwidth (<-10 dB) can cover 4.88 GHz at a thickness of 2.0 mm. Moreover, the composite with a mass ratio of 4:1 exhibits outstanding electromagnetic shielding performance, which also broadens its fields of application. This outstanding microwave absorption and electromagnetic shielding performance indicate that the composite can potentially be employed as a multi-functional material.
Highlights
With the wide application of electromagnetic (EM) waves in the GHz frequency band in recent years, electromagnetic pollution has become quite a serious and universal problem (Li et al, 2006; Saini and Arora, 2013)
We have found that controlling the time of the applied magnetic field is a good way to adjust the distance between the nanoparticles in the chain
The XRD results for reduced graphene oxide (rGO)/Fe3O4@SiO2 composites show that GO can be effectively reduced to rGO by chemical reduction
Summary
With the wide application of electromagnetic (EM) waves in the GHz frequency band in recent years, electromagnetic pollution has become quite a serious and universal problem (Li et al, 2006; Saini and Arora, 2013). Though it is a typical ferrite material that is low-cost for industrial production, Fe3O4 is seriously limited in terms of electromagnetic wave absorption and shielding properties. Its microwave absorption performance is usually poorer in the high-frequency range due to the eddy current effect. Focusing on the fabrication of one dimensional (1D) nanomaterials is a useful way to conquer the problem of low permeability values in the high-frequency range on account of rGO and Fe3O4@SiO2 Nanochains
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