Simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors

Abstract Heat-treatments may change the defect and surface organic groups of carbon nanotubes (CNTs), and lead to significant changes in the microwave electromagnetic parameter of CNTs. In this paper, the effect of heat-treatment time and temperature on the complex dielectric constant and permeabili...

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Autores principales:	Danfeng Zhang, Zhifeng Hao, Yannan Qian, Yinxin Huang, Bizeng, Zhenda Yang, Wu Qibai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e15b7731aeab44b49020f91d6affd697
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spelling	oai:doaj.org-article:e15b7731aeab44b49020f91d6affd6972021-12-02T12:32:45ZSimulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors10.1038/s41598-017-00372-92045-2322https://doaj.org/article/e15b7731aeab44b49020f91d6affd6972017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00372-9https://doaj.org/toc/2045-2322Abstract Heat-treatments may change the defect and surface organic groups of carbon nanotubes (CNTs), and lead to significant changes in the microwave electromagnetic parameter of CNTs. In this paper, the effect of heat-treatment time and temperature on the complex dielectric constant and permeability as well as the microwave reflectivity of CNTs was investigated. The experimental results indicated that the microwave absorption property of CNTs arises mainly from the high permittivity and consequent dielectric loss. Moreover, the heat-treatment resulted in increased dielectric constant of CNTs and significant improvement of the microwave absorption at frequency values of 2–18 GHz. The microwave reflectivity of CNT composites with a coating thickness of 3 mm was simulated by using the electromagnetic parameters. The absorption peak of CNTs treated at 700 °C had an amplitude of R = −48 dB, which occurred at 9 GHz. Below −10 dB, the composites treated at 900 °C had a bandwidth of 7 GHz. The position of the absorption peak concurred with the measured results. The results indicated that the microwave-absorption properties can be modified by adjusting heat-treatment temperature and time.Danfeng ZhangZhifeng HaoYannan QianYinxin HuangBizengZhenda YangWu QibaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Danfeng Zhang Zhifeng Hao Yannan Qian Yinxin Huang Bizeng Zhenda Yang Wu Qibai Simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors
description	Abstract Heat-treatments may change the defect and surface organic groups of carbon nanotubes (CNTs), and lead to significant changes in the microwave electromagnetic parameter of CNTs. In this paper, the effect of heat-treatment time and temperature on the complex dielectric constant and permeability as well as the microwave reflectivity of CNTs was investigated. The experimental results indicated that the microwave absorption property of CNTs arises mainly from the high permittivity and consequent dielectric loss. Moreover, the heat-treatment resulted in increased dielectric constant of CNTs and significant improvement of the microwave absorption at frequency values of 2–18 GHz. The microwave reflectivity of CNT composites with a coating thickness of 3 mm was simulated by using the electromagnetic parameters. The absorption peak of CNTs treated at 700 °C had an amplitude of R = −48 dB, which occurred at 9 GHz. Below −10 dB, the composites treated at 900 °C had a bandwidth of 7 GHz. The position of the absorption peak concurred with the measured results. The results indicated that the microwave-absorption properties can be modified by adjusting heat-treatment temperature and time.
format	article
author	Danfeng Zhang Zhifeng Hao Yannan Qian Yinxin Huang Bizeng Zhenda Yang Wu Qibai
author_facet	Danfeng Zhang Zhifeng Hao Yannan Qian Yinxin Huang Bizeng Zhenda Yang Wu Qibai
author_sort	Danfeng Zhang
title	Simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors
title_short	Simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors
title_full	Simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors
title_fullStr	Simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors
title_full_unstemmed	Simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors
title_sort	simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e15b7731aeab44b49020f91d6affd697
work_keys_str_mv	AT danfengzhang simulationandmeasurementofoptimizedmicrowavereflectivityforcarbonnanotubeabsorberbycontrollingelectromagneticfactors AT zhifenghao simulationandmeasurementofoptimizedmicrowavereflectivityforcarbonnanotubeabsorberbycontrollingelectromagneticfactors AT yannanqian simulationandmeasurementofoptimizedmicrowavereflectivityforcarbonnanotubeabsorberbycontrollingelectromagneticfactors AT yinxinhuang simulationandmeasurementofoptimizedmicrowavereflectivityforcarbonnanotubeabsorberbycontrollingelectromagneticfactors AT bizeng simulationandmeasurementofoptimizedmicrowavereflectivityforcarbonnanotubeabsorberbycontrollingelectromagneticfactors AT zhendayang simulationandmeasurementofoptimizedmicrowavereflectivityforcarbonnanotubeabsorberbycontrollingelectromagneticfactors AT wuqibai simulationandmeasurementofoptimizedmicrowavereflectivityforcarbonnanotubeabsorberbycontrollingelectromagneticfactors
_version_	1718394011948941312

Simulation and measurement of optimized microwave reflectivity for carbon nanotube absorber by controlling electromagnetic factors

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