Heteronanostructured Co@carbon nanotubes-graphene ternary hybrids: synthesis, electromagnetic and excellent microwave absorption properties

Abstract

In order to explore high efficiency microwave absorption materials, heteronanostructured Co@carbon nanotubes-graphene (Co@CNTs-G) ternary hybrids were designed and produced through catalytic decomposition of acetylene at the designed temperature (400, 450, 500 and 550 °C) over Co3O4/reduced graphene oxide (Co3O4/RGO). By regulating the reaction temperatures, different CNT contents of Co@CNTs-G ternary hybrids could be synthesized. The investigations indicated that the as-prepared heteronanostructured Co@CNTs-G ternary hybrids exhibited excellent microwave absorption properties, and their electromagnetic and microwave absorption properties could be tuned by the CNT content. The minimum reflection loss (RL) value reached approximately −65.6, −58.1, −41.1 and −47.5 dB for the ternary hybrids synthesized at 400, 450, 500 and 550 °C, respectively. And RL values below −20 dB (99% of electromagnetic wave attenuation) could be obtained over the as-prepared Co@CNTs-G ternary hybrids in the large frequency range. Moreover, based on the obtained results, the possible enhanced microwave absorption mechanisms were discussed in details. Therefore, a simple approach was proposed to explore the high performance microwave absorbing materials as well as to expand the application field of graphene-based materials.

Nickel Nanoparticle Encapsulated in Few-Layer Nitrogen-Doped Graphene Supported by Nitrogen-Doped Graphite Sheets as a High-Performance Electromagnetic Wave Absorbing Material

“…Recently, ultrathin two-dimensional materials such as graphene have attracted much attention due to their excellent physicochemical properties. As for applications in the EMW absorption field, graphene sheets were commonly used as substrates for supporting nanostructures. − By reasonable structure designation, those graphene-based composites showed enhanced EMW absorption properties in comparison to single counterparts. − Especially, coupling the magnetic nanomaterials with graphene sheets could efficiently improve EMW absorption properties. − For example, Pan et al prepared Co/G composites through a phase-controlled strategy and found that the α-Co/G composite exhibited enhanced EMW absorption property with a minimal R L value of −47.5 dB at 11.9 GHz . Our previous result showed that coupling hollow Fe 3 O 4 –Fe nanoparticles with graphene could improve the EMW absorption property of the composite .…”

Recent advances in electromagnetic interference shielding properties of carbon-fibre-reinforced polymer composites—a topical review

“…Examples include magnetically filled or coated carbon nanotubes [64][65][66][67][68], ferrite-carbon [69][70][71][72] and ferrite-graphene [73][74][75][76] composites. To further upgrade the attenuation, there have recently been significant efforts in constructing hybrid hierarchical composite nanostructures with complicated geometrical morphologies [77][78][79][80][81][82][83][84][85][86]. This includes graphene oxide/nickel nanofibers with hierarchical core/shell structure and vertically aligned graphene edge planes [78] or ZnFe 2 O 4 particles synthesised inside porous hollow carbon microspheres [77], where the multiple interfaces in the structure improved interfacial polarisation and thus the overall absorbing capabilities.…”

Conductive, Superhydrophobic, and Microwave-Absorbing Cotton Fabric by Dip-Coating of Aqueous Silk Nanofibers Stabilized MWCNTs and Octadecanoyl Chain Bonding

“…14b, the RL min of SNFs-MWCNTs were larger than − 20 dB covering the testing thicknesses from 2.5 to 3.0 mm. Generally speaking, RL values under − 10 dB indicates > 90% microwave absorption (Mu et al 2018) and > 99% microwave were absorbed when RL is below − 20 dB (Qi et al 2016). Obviously, as expected, SNFs-MWCNTs showed the optimum enhanced microwave absorption with the RL min for − 36.08 dB at 9.28 GHz with 2.7 mm thickness, when the lling amount of MWCNTs was merely 0.78%.…”