Abstract
The core-shell structured Co3O4-PANI nanocomposites have been successfully prepared using an in situ polymerization method, while the core Co3O4 nanoparticles were synthesized by carbon-assisted method using degreasing cotton as a template. The obtained samples were characterized by XRD, TEM, FTIR, and XPS. The results indicated that the amorphous PANI was well covered on the surface of the spinel Co3O4 and the Co3O4-PANI with core-shell structure was formed with particle size of about 100 nm. The interfacial interaction of the core-shell nanocomposite greatly enhances the microwave absorption properties. The maximum reflection loss of Co3O4-PANI is up to −45.8 dB at 11.7 GHz with a thickness of 2.5 mm and the adsorption bandwidth with the reflection loss below −10 dB reaches 14.1 GHz ranging from 3.9 to 18 GHz when the thickness is between 2 and 5.5 mm. Therefore, the facilely synthesized and low-cost Co3O4-PANI nanocomposite with superior microwave absorption properties can be a promising nanomaterial for high efficient microwave absorption.
Highlights
With the wide use of electronic devices, the electromagnetic pollution has been a growing threat to the stable running of electronically controlled systems and more importantly to our healthy life [1, 2]
We report a core-shell structured Co3O4PANI nanocomposite with a maximum reflection loss of up to −45.8 dB at 11.7 GHz when its thickness is 2.5 mm
In the pattern of Co3O4-PANI, comparing to pure Co3O4, all peaks of Co3O4 become weaker and the peaks at 2θ = 38.5, 55.6, and 77.3 are even too weak to be observed, which is on account of the PANI coating
Summary
With the wide use of electronic devices, the electromagnetic pollution has been a growing threat to the stable running of electronically controlled systems and more importantly to our healthy life [1, 2]. Recent studies have demonstrated that Co3O4 can be used as excellent microwave absorption material. Co3O4 hybrid hollow spheres synthesized by Wu et al can absorb microwave with maximum reflection loss of −18.5 dB at 6.5 GHz when the thickness is 5.00 mm [16]. The maximum reflection loss is −32.3 dB at 11.4 GHz with thickness of 2.3 mm. The RGO-Co3O4, PANI-RGO-Co3O4, and PPy-RGO-Co3O4 nanocomposites researched by Liu et al have maximum reflection losses of −43.7 dB at 13.8 GHz We report a core-shell structured Co3O4PANI nanocomposite with a maximum reflection loss of up to −45.8 dB at 11.7 GHz when its thickness is 2.5 mm. The behaviors of microwave absorption of Co3O4-PANI were investigated and the microwave absorbing mechanisms were discussed
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