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Dynamic modulation of permittivity properties via compression of carbon nanotube-impregnated cotton for wide epsilon-near-zero bandwidth

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Abstract

Here, carbon nanotube (CNT)-impregnated cotton was produced by impregnation and drying treatment. Negative permittivity was observed from the CNT loading above 14 wt% for air-dried CNT-impregnated cotton (AD-CNTs@cotton) and 2 wt% for freeze-dried CNT-impregnated cotton (FD-CNTs@cotton), respectively. The CNT loading of FD-CNTs@cotton with negative permittivity decreased significantly resulting from the “semi-coated” state of CNTs on cotton. Through regulating the compression, negative permittivity especially epsilon-near-zero (ENZ) was easily achieved. When the thickness was compressed to 0.1 mm, the ENZ bandwidth was up to around 950 kHz at 14%AD-CNTs@cotton. Drude and parallel model were used to explain the negative permittivity. Besides, through thin spline interpolation, this work firstly utilized fitting to predict the thickness achieving ENZ property (ENZ thickness). The curved surface graphs were fitted, and the intersection line graph showed that the ENZ thickness increased with the CNT loading. It was expected that the widest ENZ bandwidth was from 10 kHz to 1 MHz on 14%AD-CNTs@cotton at thickness of 0.24 mm. However, the ENZ bandwidth (from 322 to 376 kHz) of FD-CNTs@cotton was obviously narrow. This work provides a dynamic modulation and numerical prediction strategy to realize the wide ENZ bandwidth via compression.

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Funding

This work was funded by the Natural Science Foundation of Shandong Province (No. ZR2022ME098) and Research Projects of Jilin Electric Power Research Institute Co., Ltd. (No. KY-GS-23-02-03).

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Authors and Affiliations

  1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, 17923, Jingshi Road, Jinan, 250061, China

    Guangshen Li, Zhihao Sun, Zihao Guo, Peng Wang, Benli Du, Shaoyao Tian, Han Ding, Yu Qiu, Jingyu Bi & Lei Qian

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  1. Guangshen Li
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  2. Zhihao Sun
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Contributions

Guangshen Li wrote the main manuscript text. Zhihao Sun, Zihao Guo, and Lei Qian provided pieces of advice and suggestions. Guangshen Li, Peng Wang, Benli Du, Shaoyao Tian, Han Ding, Yu Qiu, and Jingyu Bi prepared Figs. 1, 2, 3, 4, 5, 6, 7, and 8, S1–S3, and Table S1. All authors reviewed the manuscript.

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Li, G., Sun, Z., Guo, Z. et al. Dynamic modulation of permittivity properties via compression of carbon nanotube-impregnated cotton for wide epsilon-near-zero bandwidth. Adv Compos Hybrid Mater 7, 83 (2024). https://doi.org/10.1007/s42114-024-00895-6

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