Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes

Barnett, Chris J.; Gowenlock, Cathren; Welsby, Kathryn; White, Alvin Orbaek; Barron, Andrew

doi:10.1021/acs.nanolett.7b03390

Journal article 1193 views 244 downloads

Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes

Chris J. Barnett, Cathren Gowenlock

, Kathryn Welsby, Alvin Orbaek White

, Andrew Barron

Nano Letters, Volume: 18, Issue: 2, Pages: 695 - 700

Swansea University Authors: Cathren Gowenlock , Alvin Orbaek White , Andrew Barron

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DOI (Published version): 10.1021/acs.nanolett.7b03390

Abstract

Two-point probe and Raman spectroscopy have been used to investigate the effects of vacuum annealing and argon bombardment, on the conduction characteristics of MWCNTs. Surface contamination has a large effect on the two-point probe conductivity measurements resulting in inconsistent and non-reprodu...

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Published in:	Nano Letters
ISSN:	1530-6984 1530-6992
Published:	2018
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa37946
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first_indexed	2018-01-05T14:28:32Z
last_indexed	2021-01-14T03:58:57Z
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spelling	2021-01-13T13:14:55.6514285 v2 37946 2018-01-05 Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes 3e999073c98799427c833bb5d331ef51 0000-0001-5774-5263 Cathren Gowenlock Cathren Gowenlock 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 2018-01-05 EEN Two-point probe and Raman spectroscopy have been used to investigate the effects of vacuum annealing and argon bombardment, on the conduction characteristics of MWCNTs. Surface contamination has a large effect on the two-point probe conductivity measurements resulting in inconsistent and non-reproducible contacts as well as enhancing the electric field under the contacts resulting from overlapping depletion regions when probe separations are small (< 4 μm) causing very high resistances. Annealing at 200 °C and 500 °C reduced the surface contamination on the MWCNT, but high resistance contacts still did not allow intrinsic conductivity measurements of the MWCNT. The high resistance measured due to the overlapping depletion regions was not observed after annealing to 500 °C. Argon bombardment reduced the surface contamination more than vacuum annealing at 500 °C but caused a slight increase in the defects concentration, enabling the resistivity of the MWCNT to be calculated, which is found to be dependent on the CNT diameter. The observations have significant implications for future CNT-based devices. Journal Article Nano Letters 18 2 695 700 1530-6984 1530-6992 14 2 2018 2018-02-14 10.1021/acs.nanolett.7b03390 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2021-01-13T13:14:55.6514285 2018-01-05T11:01:26.1808034 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Chris J. Barnett 1 Cathren Gowenlock 0000-0001-5774-5263 2 Kathryn Welsby 3 Alvin Orbaek White 0000-0001-6338-5970 4 Andrew Barron 0000-0002-2018-8288 5 0037946-05012018110431.pdf barnett2017v3.pdf 2018-01-05T11:04:31.7630000 Output 1061459 application/pdf Accepted Manuscript true 2018-12-19T00:00:00.0000000 true eng
title	Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes
spellingShingle	Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes Cathren Gowenlock Alvin Orbaek White Andrew Barron
title_short	Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes
title_full	Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes
title_fullStr	Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes
title_full_unstemmed	Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes
title_sort	Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes
author_id_str_mv	3e999073c98799427c833bb5d331ef51 8414a23650d4403fdfe1a735dbd2e24e 92e452f20936d688d36f91c78574241d
author_id_fullname_str_mv	3e999073c98799427c833bb5d331ef51_*_Cathren Gowenlock 8414a23650d4403fdfe1a735dbd2e24e__Alvin Orbaek White 92e452f20936d688d36f91c78574241d_**_Andrew Barron
author	Cathren Gowenlock Alvin Orbaek White Andrew Barron
author2	Chris J. Barnett Cathren Gowenlock Kathryn Welsby Alvin Orbaek White Andrew Barron
format	Journal article
container_title	Nano Letters
container_volume	18
container_issue	2
container_start_page	695
publishDate	2018
institution	Swansea University
issn	1530-6984 1530-6992
doi_str_mv	10.1021/acs.nanolett.7b03390
college_str	Faculty of Science and Engineering
hierarchytype
hierarchy_top_id	facultyofscienceandengineering
hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
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description	Two-point probe and Raman spectroscopy have been used to investigate the effects of vacuum annealing and argon bombardment, on the conduction characteristics of MWCNTs. Surface contamination has a large effect on the two-point probe conductivity measurements resulting in inconsistent and non-reproducible contacts as well as enhancing the electric field under the contacts resulting from overlapping depletion regions when probe separations are small (< 4 μm) causing very high resistances. Annealing at 200 °C and 500 °C reduced the surface contamination on the MWCNT, but high resistance contacts still did not allow intrinsic conductivity measurements of the MWCNT. The high resistance measured due to the overlapping depletion regions was not observed after annealing to 500 °C. Argon bombardment reduced the surface contamination more than vacuum annealing at 500 °C but caused a slight increase in the defects concentration, enabling the resistivity of the MWCNT to be calculated, which is found to be dependent on the CNT diameter. The observations have significant implications for future CNT-based devices.
published_date	2018-02-14T03:47:54Z
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score	11.013731

Spatial and Contamination-Dependent Electrical Properties of Carbon Nanotubes

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