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Silica Microspheres Templated Self-Assembly of Three-dimensional Carbon Network with Stable Radio-Frequency Negative Permittivity and Low Dielectric Loss

Abstract

Percolative composites always suffer from their unstable and filler-loading dependent microstructure and negative electromagnetic parameters. Here, stable negative permittivity is achieved by in situ constructing three-dimensional carbon network in the silica spherical matrix after a self-assembly and pyrolysis process. An electrical percolation phenomenon appears with the formation of carbon network. Once the carbon network is formed, further increasing carbon loadings will only influence the porosity rather than the connectivity due to the nature of porous carbon itself. Hence, the microstructure and plasma-like negative permittivity are not sensitive to carbon loading, leading to a negligible carbon loading dependent behavior. Moreover, negative permittivity with a small value (-100<ε′<0), beneficial for matching with permeability, was effectively adjusted by changing the carbonization temperature. The carbon composites with negative permittivity showed an extremely low dielectric loss (tanδ=1-7) compared with metal composites (usually tanδ=10-100). This work provides a convenient means to obtain stable negative permittivity property. The carbon composites can be regarded as a promising candidate for metamaterials and will facilitate the applications of materials with negative electromagnetic parameters.

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Publication details

The article was received on 24 Dec 2017, accepted on 04 Apr 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C7TC05911F
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Silica Microspheres Templated Self-Assembly of Three-dimensional Carbon Network with Stable Radio-Frequency Negative Permittivity and Low Dielectric Loss

    P. Xie, Z. Wang, Z. Zhang, R. Fan, C. Cheng, H. Liu, Y. Liu, T. Li, C. Yan, N. Wang and Z. Guo, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC05911F

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