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      CNT@NiO/natural rubber with excellent impedance matching and low interfacial thermal resistance toward flexible and heat-conducting microwave absorption applications

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          Abstract

          Herein, CNT@NiO/natural rubber composites were fabricated to apply as flexible and heat-conducting microwave absorption materials.

          Abstract

          The development of functional materials with both excellent electromagnetic wave absorption and high-efficiency thermal conductivity is becoming crucial and urgent due to the great progress in the miniaturization and integration of electronic components. Carbon nanotubes (CNTs) are very promising but still suffer from the disadvantages of poor microwave absorption and unsatisfactory heat conduction because of their impedance mismatching and interfacial thermal resistance. In this work, a modified atomic layer deposition (ALD) method is developed to fabricate CNT@NiO core shell structures in order to improve electromagnetic impedance matching and decrease interfacial thermal resistance. A uniform NiO coating can be grown with high efficiency onto the surface of CNTs by utilizing O 3 and H 2O as oxygen source simultaneously. The CNT@NiO composites exhibit remarkably improved microwave absorption properties compared to the pristine CNTs. The optimal reflection loss reaches −43.6 dB at 17.5 GHz and have a thickness of only 1.3 mm. Moreover, the effective absorption frequency can be regulated by simply adjusting the cycle number of ALD NiO. The remarkable microwave absorption properties may be attributed to the multiple interfacial polarization, good impedance matching and multiple reflection and scattering owing to the synergistic effects from the well-balanced combination of CNT and NiO. In addition, the uniform NiO coating can serve as an intermediate layer between the matrix and CNTs to reduce the interface thermal resistance, resulting in the remarkable enhancement of thermal conductivity. With natural rubber (NR) as the matrix, the CNT@NiO/NR flexible composites can be potentially applied in the field of electronic packaging, microwave absorption and thermal management.

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            Microwave Absorption Enhancement and Complex Permittivity and Permeability of Fe Encapsulated within Carbon Nanotubes

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              Reduced graphene oxides: light-weight and high-efficiency electromagnetic interference shielding at elevated temperatures.

              Chemical graphitized r-GOs, as the thinnest and lightest material in the carbon family, exhibit high-efficiency electromagnetic interference (EMI) shielding at elevated temperature, attributed to the cooperation of dipole polarization and hopping conductivity. The r-GO composites show different temperature-dependent imaginary permittivities and EMI shielding performances with changing mass ratio.
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                Author and article information

                Contributors
                Journal
                JMCCCX
                Journal of Materials Chemistry C
                J. Mater. Chem. C
                Royal Society of Chemistry (RSC)
                2050-7526
                2050-7534
                January 28 2021
                2021
                : 9
                : 3
                : 869-880
                Affiliations
                [1 ]Key Laboratory of Advanced Materials of Tropical Island Resources (Hainan University)
                [2 ]Ministry of Education
                [3 ]Haikou 570228
                [4 ]P. R. China
                [5 ]College of Materials Science and Engineering
                [6 ]Hainan University
                Article
                10.1039/D0TC04388E
                5307777c-61a1-4de0-bc5b-cd711c75c84f
                © 2021

                http://rsc.li/journals-terms-of-use

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