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.
Highlights
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)
The previously reported results indicated that the microwave absorption (MA) capability of Microwave absorbing materials (MAMs) was mainly determined by the εr, μr, EM impedance matching and microstructure
In order to obtain more information about RGO, the Raman spectrum of Co3O4/RGO is presented in Fig. 1b, two strong peaks centered at ca. 1348 (D band) and 1598 cm−1 (G band) can be observed clearly
Summary
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). Based on the impedance matching strategy, one of the effective ways to solve the problem is to couple dielectric materials with magnetic nanoparticles Among these hybrids, heteronanostructured hybrids have been proved to exhibit strong EM wave absorption properties because of their interfacial and synergistic effects. The previously reported results indicated that the microwave absorption (MA) capability of MAMs was mainly determined by the εr, μr, EM impedance matching and microstructure These hybrids still suffer from some problems such as high density, large thickness of absorber, optimal RL usually above −40 dB, and so on. The aim of designing these hybrids has mainly three points: firstly, Co nanoparticles and CNTs/graphene can be used as magnetic and dielectric loss materials, respectively By controlling their compositions, a good impedance matching may be obtained on these hybrids. The heteronanostructure of hybrid can provide the synergetic effect of Co, CNTs and graphene, which should enhance MA capability greatly
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