Roles of inter-SWCNT junctions in resistive humidity response
As a promising chemiresistor for gas sensing, the single-walled carbon nanotube (SWCNT) network has not yet been fully utilized for humidity detection. In this work, it is found that as humidity increases from 10% to 85%, the resistance of as-grown SWCNT networks first decreases and then increases....
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2016
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| Online Access: | https://hdl.handle.net/10356/83002 http://hdl.handle.net/10220/40372 |
| _version_ | 1824455046880821248 |
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| author | Zhang, Kang Zou, Jianping Zhang, Qing |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Zhang, Kang Zou, Jianping Zhang, Qing |
| author_sort | Zhang, Kang |
| collection | NTU |
| description | As a promising chemiresistor for gas sensing, the single-walled carbon nanotube (SWCNT) network has not yet been fully utilized for humidity detection. In this work, it is found that as humidity increases from 10% to 85%, the resistance of as-grown SWCNT networks first decreases and then increases. This non-monotonic resistive response to humidity limits their sensing capabilities. The competition between SWCNT resistance and inter-tube junction resistance changes is then found to be responsible for the non-monotonic resistive humidity responses. Moreover, creating sp3 scattering centers on the SWCNT sidewall by monovalent functionalization of four-bromobenzene diazonium tetrafluoroborate is shown to be capable of eliminating the influence from the inter-tube junctions, resulting in a continuous resistance drop as humidity increases from 10% to 85%. Our results revealed the competing resistive humidity sensing process in as-grown SWCNT networks, which could also be helpful in designing and optimizing as-grown SWCNT networks for humidity sensors and other gas sensors. |
| first_indexed | 2025-02-19T03:31:59Z |
| format | Journal Article |
| id | ntu-10356/83002 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:31:59Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/830022020-03-07T13:57:25Z Roles of inter-SWCNT junctions in resistive humidity response Zhang, Kang Zou, Jianping Zhang, Qing School of Electrical and Electronic Engineering Carrier hopping Covalent functionalization Sensitivity As a promising chemiresistor for gas sensing, the single-walled carbon nanotube (SWCNT) network has not yet been fully utilized for humidity detection. In this work, it is found that as humidity increases from 10% to 85%, the resistance of as-grown SWCNT networks first decreases and then increases. This non-monotonic resistive response to humidity limits their sensing capabilities. The competition between SWCNT resistance and inter-tube junction resistance changes is then found to be responsible for the non-monotonic resistive humidity responses. Moreover, creating sp3 scattering centers on the SWCNT sidewall by monovalent functionalization of four-bromobenzene diazonium tetrafluoroborate is shown to be capable of eliminating the influence from the inter-tube junctions, resulting in a continuous resistance drop as humidity increases from 10% to 85%. Our results revealed the competing resistive humidity sensing process in as-grown SWCNT networks, which could also be helpful in designing and optimizing as-grown SWCNT networks for humidity sensors and other gas sensors. MOE (Min. of Education, S’pore) Accepted version 2016-04-01T07:29:42Z 2019-12-06T15:10:02Z 2016-04-01T07:29:42Z 2019-12-06T15:10:02Z 2015 Journal Article Zhang, K., Zou, J., & Zhang, Q. (2015). Roles of inter-SWCNT junctions in resistive humidity response. Nanotechnology, 26, 45501-. 0957-4484 https://hdl.handle.net/10356/83002 http://hdl.handle.net/10220/40372 10.1088/0957-4484/26/45/455501 en Nanotechnology © 2015 IOP Publishing Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Nanotechnology, IOP Publishing Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1088/0957-4484/26/45/455501]. 26 p. application/pdf |
| spellingShingle | Carrier hopping Covalent functionalization Sensitivity Zhang, Kang Zou, Jianping Zhang, Qing Roles of inter-SWCNT junctions in resistive humidity response |
| title | Roles of inter-SWCNT junctions in resistive humidity response |
| title_full | Roles of inter-SWCNT junctions in resistive humidity response |
| title_fullStr | Roles of inter-SWCNT junctions in resistive humidity response |
| title_full_unstemmed | Roles of inter-SWCNT junctions in resistive humidity response |
| title_short | Roles of inter-SWCNT junctions in resistive humidity response |
| title_sort | roles of inter swcnt junctions in resistive humidity response |
| topic | Carrier hopping Covalent functionalization Sensitivity |
| url | https://hdl.handle.net/10356/83002 http://hdl.handle.net/10220/40372 |
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