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Carbon nanotube-CdS core-shell nanowires with tunable and high-efficiency microwave absorption at elevated temperature

机译：碳纳米管-CdS核-壳纳米线，在高温下具有可调且高效的微波吸收能力

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摘要

Tuning microwave absorption to meet the harsh requirement of thermal environments is a great challenge. Three kinds of nanowires, including multi-walled carbon nanotubes (MWCNTs) coated with CdS nanocrystals (CdS-MWCNTs), and MWCNTs coated with different-thickness CdS sheaths, have been synthesized through mild solution-process synthesis. The influence of CdS amount, external temperature, loading concentration and sample thickness on the absorption performance were studied. The composite loading with 6 vol.% CdS-MWCNTs shows the best absorption of -47 dB at 473 K with a thickness of 2.6 mm in the temperature range of 323-573 K and X band. The effective bandwidth covers the full X band in 323-473 K for RL <= -20 dB and reaches 2.0 GHz at 473 K for RL <= -20 dB. The enhanced absorption ability of CdS-MWCNTs arises from the effective impedance matching, benefiting from abundant interfacial polarization from the added CdS nanocrystals and the changeable dielectric property at elevated temperature. The results indicate that the CdS-MWCNT is a promising functional material for high temperature microwave absorption.
机译：调整微波吸收以满足热环境的苛刻要求是一个巨大的挑战。通过温和的固溶过程合成法合成了三种纳米线，包括包覆有CdS纳米晶体的多壁碳纳米管（MWd）和包覆有不同厚度的CdS鞘的MWCNT。研究了CdS含量，外部温度，负载浓度和样品厚度对吸收性能的影响。在323 K和573 K的温度范围内，在473 K时厚度为2.6 mm的CdS-MWCNTs含量为6％（体积）时，复合材料的最佳吸收为-47 dB。对于RL <= -20 dB，有效带宽覆盖323-473 K中的整个X频段，对于RL <= -20 dB，有效带宽在473 K时达到2.0 GHz。 CdS-MWCNTs增强的吸收能力来自有效的阻抗匹配，得益于添加的CdS纳米晶体的大量界面极化以及在高温下可变的介电性能。结果表明，CdS-MWCNT是一种有前途的高温微波吸收功能材料。

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