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Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays
Due to the high field enhancement factor and photon-absorption efficiency, carbon nanotubes (CNTs) have been widely used in optically induced field-emission as a cathode. Here, we report vertical carbon nanotube arrays (VCNTAs) that performed as high-density electron sources. A combination of high a...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8308351/ https://www.ncbi.nlm.nih.gov/pubmed/34361196 http://dx.doi.org/10.3390/nano11071810 |
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author | Li, Mengjie Wang, Qilong Xu, Ji Zhang, Jian Qi, Zhiyang Zhang, Xiaobing |
author_facet | Li, Mengjie Wang, Qilong Xu, Ji Zhang, Jian Qi, Zhiyang Zhang, Xiaobing |
author_sort | Li, Mengjie |
collection | PubMed |
description | Due to the high field enhancement factor and photon-absorption efficiency, carbon nanotubes (CNTs) have been widely used in optically induced field-emission as a cathode. Here, we report vertical carbon nanotube arrays (VCNTAs) that performed as high-density electron sources. A combination of high applied electric field and laser illumination made it possible to modulate the emission with laser pulses. When the bias electric field and laser power density increased, the emission process is sensitive to a power law of the laser intensity, which supports the emission mechanism of optically induced field emission followed by over-the-barrier emission. Furthermore, we determine a polarization dependence that exhibits a cosine behavior, which verifies the high possibility of optically induced field emission. |
format | Online Article Text |
id | pubmed-8308351 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-83083512021-07-25 Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays Li, Mengjie Wang, Qilong Xu, Ji Zhang, Jian Qi, Zhiyang Zhang, Xiaobing Nanomaterials (Basel) Article Due to the high field enhancement factor and photon-absorption efficiency, carbon nanotubes (CNTs) have been widely used in optically induced field-emission as a cathode. Here, we report vertical carbon nanotube arrays (VCNTAs) that performed as high-density electron sources. A combination of high applied electric field and laser illumination made it possible to modulate the emission with laser pulses. When the bias electric field and laser power density increased, the emission process is sensitive to a power law of the laser intensity, which supports the emission mechanism of optically induced field emission followed by over-the-barrier emission. Furthermore, we determine a polarization dependence that exhibits a cosine behavior, which verifies the high possibility of optically induced field emission. MDPI 2021-07-12 /pmc/articles/PMC8308351/ /pubmed/34361196 http://dx.doi.org/10.3390/nano11071810 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Li, Mengjie Wang, Qilong Xu, Ji Zhang, Jian Qi, Zhiyang Zhang, Xiaobing Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays |
title | Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays |
title_full | Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays |
title_fullStr | Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays |
title_full_unstemmed | Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays |
title_short | Optically Induced Field-Emission Source Based on Aligned Vertical Carbon Nanotube Arrays |
title_sort | optically induced field-emission source based on aligned vertical carbon nanotube arrays |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8308351/ https://www.ncbi.nlm.nih.gov/pubmed/34361196 http://dx.doi.org/10.3390/nano11071810 |
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