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Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction

Christopher Barnett, Alvin Orbaek White Orcid Logo, Andrew Barron Orcid Logo

Carbon Letters

Swansea University Authors: Christopher Barnett, Alvin Orbaek White Orcid Logo, Andrew Barron Orcid Logo

Abstract

Multi-walled carbon nanotubes (MWCNTs) grown by chemical vapor deposition retain the residual catalyst particles from which the growth occurred, which are considered a detriment to MWCNTs’ performance, especially electrical conductivity. The first direct measurements have been made of the electrical...

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Published in: Carbon Letters
ISSN: 1976-4251 2233-4998
Published: Springer Science and Business Media LLC 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56005
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spelling 2022-04-27T12:26:24.5787378 v2 56005 2021-01-11 Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction 3cc4b7c0dcf59d3ff31f9f13b0e5a831 Christopher Barnett Christopher Barnett true false 8414a23650d4403fdfe1a735dbd2e24e 0000-0001-6338-5970 Alvin Orbaek White Alvin Orbaek White true false 92e452f20936d688d36f91c78574241d 0000-0002-2018-8288 Andrew Barron Andrew Barron true false 2021-01-11 FGSEN Multi-walled carbon nanotubes (MWCNTs) grown by chemical vapor deposition retain the residual catalyst particles from which the growth occurred, which are considered a detriment to MWCNTs’ performance, especially electrical conductivity. The first direct measurements have been made of the electrical transport through the catalyst cap into the MWCNT using nanoscale 2-point-probe to determine the effects of the catalyst particle’s size and the diameter ratio with its associated MWCNT on the electrical transport through the catalyst cap as compared to the inherent conductivity of the MWCNT. The MWCNT diameter is independent of the catalyst size, but the ratio of the catalyst cap diameter to MWCNT diameter (DC/DNT) determines the conduction mechanism. Where DC/DNT is greater than 1 the resulting I–V curve is near ohmic, and the conduction through the catalyst (RC+NT) approaches that of the MWCNT (RNT); however, when the DC/DNT < 1 the I–V curves shift to rectifying and RC+NT >  > RNT. The experimental results are discussed in relation to current crowding at the interface between catalyst and nanotube due to an increased electric field. Journal Article Carbon Letters Springer Science and Business Media LLC 1976-4251 2233-4998 Multi-walled carbon nanotubes; Catalyst; Electrical conductivity; Contact resistance; Nanoprobe 4 1 2021 2021-01-04 10.1007/s42823-020-00215-0 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2022-04-27T12:26:24.5787378 2021-01-11T12:02:29.0869271 College of Engineering Engineering Christopher Barnett 1 Alvin Orbaek White 0000-0001-6338-5970 2 Andrew Barron 0000-0002-2018-8288 3 56005__19020__79a2dc29f579476fa2a4af1268c41d74.pdf 56005.pdf 2021-01-11T12:52:00.5847785 Output 1619332 application/pdf Accepted Manuscript true 2022-01-04T00:00:00.0000000 true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
spellingShingle Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
Christopher Barnett
Alvin Orbaek White
Andrew Barron
title_short Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
title_full Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
title_fullStr Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
title_full_unstemmed Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
title_sort Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
author_id_str_mv 3cc4b7c0dcf59d3ff31f9f13b0e5a831
8414a23650d4403fdfe1a735dbd2e24e
92e452f20936d688d36f91c78574241d
author_id_fullname_str_mv 3cc4b7c0dcf59d3ff31f9f13b0e5a831_***_Christopher Barnett
8414a23650d4403fdfe1a735dbd2e24e_***_Alvin Orbaek White
92e452f20936d688d36f91c78574241d_***_Andrew Barron
author Christopher Barnett
Alvin Orbaek White
Andrew Barron
author2 Christopher Barnett
Alvin Orbaek White
Andrew Barron
format Journal article
container_title Carbon Letters
publishDate 2021
institution Swansea University
issn 1976-4251
2233-4998
doi_str_mv 10.1007/s42823-020-00215-0
publisher Springer Science and Business Media LLC
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 1
active_str 0
description Multi-walled carbon nanotubes (MWCNTs) grown by chemical vapor deposition retain the residual catalyst particles from which the growth occurred, which are considered a detriment to MWCNTs’ performance, especially electrical conductivity. The first direct measurements have been made of the electrical transport through the catalyst cap into the MWCNT using nanoscale 2-point-probe to determine the effects of the catalyst particle’s size and the diameter ratio with its associated MWCNT on the electrical transport through the catalyst cap as compared to the inherent conductivity of the MWCNT. The MWCNT diameter is independent of the catalyst size, but the ratio of the catalyst cap diameter to MWCNT diameter (DC/DNT) determines the conduction mechanism. Where DC/DNT is greater than 1 the resulting I–V curve is near ohmic, and the conduction through the catalyst (RC+NT) approaches that of the MWCNT (RNT); however, when the DC/DNT < 1 the I–V curves shift to rectifying and RC+NT >  > RNT. The experimental results are discussed in relation to current crowding at the interface between catalyst and nanotube due to an increased electric field.
published_date 2021-01-04T04:11:20Z
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score 10.920566