Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting

Semiconducting (semi-) single-walled carbon nanotubes (SWNTs) must be purified of their metallic (met-) counterparts for most applications including nanoelectronics, solar cells, chemical sensors, and artificial skins. Previous bulk sorting techniques are based on subtle contrasts between properties...

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Main Authors: Wang, Jing, Nguyen, Tuan Dat, Cao, Qing, Wang, Yilei, Tan, Marcus Y.C., Chan-Park, Mary B.
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2016
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Online Access:https://hdl.handle.net/10356/83429
http://hdl.handle.net/10220/41423
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-834292023-12-29T06:47:19Z Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting Wang, Jing Nguyen, Tuan Dat Cao, Qing Wang, Yilei Tan, Marcus Y.C. Chan-Park, Mary B. School of Chemical and Biomedical Engineering Carbon nanotubes Gel chromatography Semiconducting (semi-) single-walled carbon nanotubes (SWNTs) must be purified of their metallic (met-) counterparts for most applications including nanoelectronics, solar cells, chemical sensors, and artificial skins. Previous bulk sorting techniques are based on subtle contrasts between properties of different nanotube/dispersing agent complexes. We report here a method which directly exploits the nanotube band structure differences. For the heterogeneous redox reaction of SWNTs with oxygen/water couple, the aqueous pH can be tuned so that the redox kinetics is determined by the availability of nanotube electrons only at/near the Fermi level, as predicted quantitatively by the Marcus–Gerischer (MG) theory. Consequently, met-SWNTs oxidize much faster than semi-SWNTs and only met-SWNTs selectively reverse the sign of their measured surface zeta potential from negative to positive at the optimized acidic pH when suspended with nonionic surfactants. By passing the redox-reacted nanotubes through anionic hydrogel beads, we isolate semi-SWNTs to record high electrically verified purity above 99.94% ± 0.04%. This facile charge sign reversal (CSR)-based sorting technique is robust and can sort SWNTs with a broad diameter range. NMRC (Natl Medical Research Council, S’pore) Accepted version 2016-09-06T06:35:37Z 2019-12-06T15:22:28Z 2016-09-06T06:35:37Z 2019-12-06T15:22:28Z 2016 Journal Article Wang, J., Nguyen, T. D., Cao, Q., Wang, Y., Tan, M. Y., & Chan-Park, M. B. (2016). Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting. ACS Nano, 10(3), 3222-3232. 1936-0851 https://hdl.handle.net/10356/83429 http://hdl.handle.net/10220/41423 10.1021/acsnano.5b05795 en ACS Nano © 2016 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Nano, American Chemical Society. 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/10.1021/acsnano.5b05795]. 43 p. application/pdf application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Carbon nanotubes
Gel chromatography
spellingShingle Carbon nanotubes
Gel chromatography
Wang, Jing
Nguyen, Tuan Dat
Cao, Qing
Wang, Yilei
Tan, Marcus Y.C.
Chan-Park, Mary B.
Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting
description Semiconducting (semi-) single-walled carbon nanotubes (SWNTs) must be purified of their metallic (met-) counterparts for most applications including nanoelectronics, solar cells, chemical sensors, and artificial skins. Previous bulk sorting techniques are based on subtle contrasts between properties of different nanotube/dispersing agent complexes. We report here a method which directly exploits the nanotube band structure differences. For the heterogeneous redox reaction of SWNTs with oxygen/water couple, the aqueous pH can be tuned so that the redox kinetics is determined by the availability of nanotube electrons only at/near the Fermi level, as predicted quantitatively by the Marcus–Gerischer (MG) theory. Consequently, met-SWNTs oxidize much faster than semi-SWNTs and only met-SWNTs selectively reverse the sign of their measured surface zeta potential from negative to positive at the optimized acidic pH when suspended with nonionic surfactants. By passing the redox-reacted nanotubes through anionic hydrogel beads, we isolate semi-SWNTs to record high electrically verified purity above 99.94% ± 0.04%. This facile charge sign reversal (CSR)-based sorting technique is robust and can sort SWNTs with a broad diameter range.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Wang, Jing
Nguyen, Tuan Dat
Cao, Qing
Wang, Yilei
Tan, Marcus Y.C.
Chan-Park, Mary B.
format Article
author Wang, Jing
Nguyen, Tuan Dat
Cao, Qing
Wang, Yilei
Tan, Marcus Y.C.
Chan-Park, Mary B.
author_sort Wang, Jing
title Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting
title_short Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting
title_full Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting
title_fullStr Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting
title_full_unstemmed Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting
title_sort selective surface charge sign reversal on metallic carbon nanotubes for facile ultrahigh purity nanotube sorting
publishDate 2016
url https://hdl.handle.net/10356/83429
http://hdl.handle.net/10220/41423
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