Exploring the feasibility of development of nanomaterial-based microwave absorbers

Rani, Surekha; Marwaha, Anupma; Marwaha, Sanjay

doi:10.1007/s40089-018-0254-2

Cited by 13 publications

(1 citation statement)

References 76 publications

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“…Serious electromagnetic interference (EMI) has attracted massive attention nowadays. Tremendous efforts have been paid to designing and fabricating advanced microwave absorption (MA) materials featured by thin thickness, light weight, strong absorption, and a wide effective bandwidth. − Among MA materials reported previously, core–shell nanocomposites are highly expected to be promising candidates due to their small sizes, large surface areas, and unique microstructures and electromagnetic properties. − To date, many core–shell nanocomposites have been developed, including carbon (C)-coated Fe, − Co, , Ni, and their alloys, − or oxide-based nanostructures. ,− The intriguing MA performances of these nanocomposites motivate strong expectations on understanding the MA mechanisms of nanocomposite absorbers. , For example, Wang et al found that the MA performance of Ni–C core–shell nanoparticles (NPs) could be tuned by the thickness of C shells . Kuang et al investigated the effects of metal cores and C shells on the MA performance of FeCo–C and FeNi–C core–shell nanoparticles by experimental results and equivalent circuit models and found that the morphology of C shells and magnetic alloyed cores have significant influences on their MA performances. , However, for the above-mentioned magnetic core–shell nanoparticles, the small size effects, complicated core–shell interface effects, and potential synergy effects with the magnetic loss of the nanocores may affect the measured MA properties.…”

Section: Introductionmentioning

confidence: 99%

Influences of Metal Core and Carbon Shell on the Microwave Absorption Performance of Cu–C Core–Shell Nanoparticles

et al. 2023

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Metal–C core–shell nanoparticles have been recently demonstrated to be promising candidates for microwave absorption applications. However, the underlying absorption mechanism, such as the contributions of the metal cores and C shells on their absorption performance, remains far from clear due to the complicated interfaces and synergetic effects between metal cores and C shells, as well as the significant challenges in the preparation of samples with well-defined comparability. In this study, Cu–C core–shell nanoparticles and their derivatives, i.e., bare Cu and hollow C nanoparticles, were synthesized for a comparative study on their microwave absorption properties. Electric energy loss models of the three samples were established, and based on these models, the comparative study suggested that the polarization loss could be significantly improved by C shells, and Cu cores had negligible influences on the conduction loss of Cu–C core–shell nanoparticles. The interface between C shells and Cu cores tuned the conduction loss and polarization loss to establish improved impedance matching and achieve optimal microwave absorption performances. A wide effective bandwidth of 5.4 GHz and a low reflection loss of −42.6 dB were achieved for Cu–C core–shell nanoparticles. This work provides new insights into how metal nanocores and C nanoshells affect the microwave absorption of core–shell nanostructures from experimental and theoretical points of view, which has reference values for the construction of highly efficient metal–C-based absorbers.

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