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Microwave Conductivity of Sorted CNT Assemblies
Recent progress with tailored growth and post-process sorting enables carbon nanotube (CNT) assemblies with predominantly metallic or semi-conducting concentrations. Cryogenic and microwave measurements performed here show transport dimensionality and overall order increasing with increasing metalli...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3896931/ https://www.ncbi.nlm.nih.gov/pubmed/24446019 http://dx.doi.org/10.1038/srep03762 |
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author | Bulmer, John S. Martens, Jon Kurzepa, Lukasz Gizewski, Tomasz Egilmez, M. Blamire, M. G. Yahya, Noorhana Koziol, Krzysztof K. K. |
author_facet | Bulmer, John S. Martens, Jon Kurzepa, Lukasz Gizewski, Tomasz Egilmez, M. Blamire, M. G. Yahya, Noorhana Koziol, Krzysztof K. K. |
author_sort | Bulmer, John S. |
collection | PubMed |
description | Recent progress with tailored growth and post-process sorting enables carbon nanotube (CNT) assemblies with predominantly metallic or semi-conducting concentrations. Cryogenic and microwave measurements performed here show transport dimensionality and overall order increasing with increasing metallic concentration, even in atmospheric doping conditions. By 120 GHz, the conductivity of predominantly semi-conducting assemblies grew to 400% its DC value at an increasing growth rate, while other concentrations a growth rate that tapered off. A generalized Drude model fits to the different frequency dependent behaviors and yields useful quality control parameters such as plasma frequency, mean free path, and degree of localization. As one of the first demonstrations of waveguides fabricated from this material, sorted CNTs from both as-made and post-process sources were inserted into sections of practical micro-strip. With both sources, sorted CNT micro-strip increasingly outperformed the unsorted with increasing frequency-- illustrating that sorted CNT assemblies will be important for high frequency applications. |
format | Online Article Text |
id | pubmed-3896931 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-38969312014-01-21 Microwave Conductivity of Sorted CNT Assemblies Bulmer, John S. Martens, Jon Kurzepa, Lukasz Gizewski, Tomasz Egilmez, M. Blamire, M. G. Yahya, Noorhana Koziol, Krzysztof K. K. Sci Rep Article Recent progress with tailored growth and post-process sorting enables carbon nanotube (CNT) assemblies with predominantly metallic or semi-conducting concentrations. Cryogenic and microwave measurements performed here show transport dimensionality and overall order increasing with increasing metallic concentration, even in atmospheric doping conditions. By 120 GHz, the conductivity of predominantly semi-conducting assemblies grew to 400% its DC value at an increasing growth rate, while other concentrations a growth rate that tapered off. A generalized Drude model fits to the different frequency dependent behaviors and yields useful quality control parameters such as plasma frequency, mean free path, and degree of localization. As one of the first demonstrations of waveguides fabricated from this material, sorted CNTs from both as-made and post-process sources were inserted into sections of practical micro-strip. With both sources, sorted CNT micro-strip increasingly outperformed the unsorted with increasing frequency-- illustrating that sorted CNT assemblies will be important for high frequency applications. Nature Publishing Group 2014-01-21 /pmc/articles/PMC3896931/ /pubmed/24446019 http://dx.doi.org/10.1038/srep03762 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-sa/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-ShareALike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ |
spellingShingle | Article Bulmer, John S. Martens, Jon Kurzepa, Lukasz Gizewski, Tomasz Egilmez, M. Blamire, M. G. Yahya, Noorhana Koziol, Krzysztof K. K. Microwave Conductivity of Sorted CNT Assemblies |
title | Microwave Conductivity of Sorted CNT Assemblies |
title_full | Microwave Conductivity of Sorted CNT Assemblies |
title_fullStr | Microwave Conductivity of Sorted CNT Assemblies |
title_full_unstemmed | Microwave Conductivity of Sorted CNT Assemblies |
title_short | Microwave Conductivity of Sorted CNT Assemblies |
title_sort | microwave conductivity of sorted cnt assemblies |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3896931/ https://www.ncbi.nlm.nih.gov/pubmed/24446019 http://dx.doi.org/10.1038/srep03762 |
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