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Giant Dielectric Response in MWCNT/Chitosan Composite Films

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Abstract

In this work, xMWCNT/chitosan composite films with multi-walled carbon nanotubes (MWCNT) as filler and chitosan as matrix were prepared via a solution blending method. Varied content of MWCNT of 0, 0.5 wt.%, 1 wt.% and 1.5 wt.% was investigated. The dielectric properties of the films were investigated in the temperature range of −60°C to 60°C and frequency range of 102–106 Hz. The experimental results show that the incorporation of MWCNT can effectively improve the dielectric properties of the film, with optimal results when the content of MWCNT is close to the percolation threshold. A giant dielectric constant (GDC) was found in all the samples and was studied by dielectric and impedance measurements. Maxwell Wagner relaxation was observed in all samples, which is caused by space charges at different interfaces. The GDC is thought to be related to a Maxwell–Wagner relaxation caused by sample–electrode contact. The addition of MWCNT can enhance the Maxwell–Wagner relaxation. The largest enhancement was found in the sample with 1 wt.% MWCNT.

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The data that support the findings of this study are available from the corresponding authors upon reasonable request.

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Acknowledgments

The authors acknowledge financial support from the National Natural Science Foundation of China (Grant Nos. 51872001 and 51572001).

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Authors and Affiliations

  1. Laboratory of Dielectric Functional Materials, School of Materials Science and Engineering, Anhui University, Hefei, 230601, China

    Jin Han, Yongfa Wang, Yanran Ma & Chunchang Wang

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  1. Jin Han
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  2. Yongfa Wang
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Contributions

All authors contributed to the study. Material preparation was performed by YW and YM. Data collection and analysis were performed by JH. The first draft of the manuscript was written by JH. The supervision of the whole work and revision of the manuscript were made by CW.

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Correspondence to Chunchang Wang.

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Han, J., Wang, Y., Ma, Y. et al. Giant Dielectric Response in MWCNT/Chitosan Composite Films. J. Electron. Mater. 52, 6602–6612 (2023). https://doi.org/10.1007/s11664-023-10593-6

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  • DOI: https://doi.org/10.1007/s11664-023-10593-6

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