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Electro-oxidation of amino-functionalized multiwalled carbon nanotubes
We report the electrochemistry of amino-functionalized multiwalled carbon nanotubes (MWCNTs-NH(2)) in the pH range from 0.3 to 6.4 using quantitative cyclic voltammetry (CV) and single entity electrochemistry measurements, making comparison with non-functionalized MWCNTs. CV showed the latter to bot...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8809411/ https://www.ncbi.nlm.nih.gov/pubmed/35222919 http://dx.doi.org/10.1039/d1sc06122d |
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author | Lu, Yuanyuan Li, Xiuting Compton, Richard G. |
author_facet | Lu, Yuanyuan Li, Xiuting Compton, Richard G. |
author_sort | Lu, Yuanyuan |
collection | PubMed |
description | We report the electrochemistry of amino-functionalized multiwalled carbon nanotubes (MWCNTs-NH(2)) in the pH range from 0.3 to 6.4 using quantitative cyclic voltammetry (CV) and single entity electrochemistry measurements, making comparison with non-functionalized MWCNTs. CV showed the latter to both catalyze the solvent (water) decomposition and to undergo irreversible electro-oxidation forming oxygen containing surface functionality. The MWCNTs-NH(2) additionally undergo an irreversible oxidation to an extent which is dependent on the pH of the solution, reflecting the variable amount of deprotonated amino groups present as a function of pH. Nano-impact experiments conducted at the single particle level confirmed the oxidation of both types of MWCNTs, showing agreement with the CV. The pK(a) of the amino groups in MWCNTs was determined via both electrochemical methods giving consistent values of ca. 2.5. |
format | Online Article Text |
id | pubmed-8809411 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-88094112022-02-24 Electro-oxidation of amino-functionalized multiwalled carbon nanotubes Lu, Yuanyuan Li, Xiuting Compton, Richard G. Chem Sci Chemistry We report the electrochemistry of amino-functionalized multiwalled carbon nanotubes (MWCNTs-NH(2)) in the pH range from 0.3 to 6.4 using quantitative cyclic voltammetry (CV) and single entity electrochemistry measurements, making comparison with non-functionalized MWCNTs. CV showed the latter to both catalyze the solvent (water) decomposition and to undergo irreversible electro-oxidation forming oxygen containing surface functionality. The MWCNTs-NH(2) additionally undergo an irreversible oxidation to an extent which is dependent on the pH of the solution, reflecting the variable amount of deprotonated amino groups present as a function of pH. Nano-impact experiments conducted at the single particle level confirmed the oxidation of both types of MWCNTs, showing agreement with the CV. The pK(a) of the amino groups in MWCNTs was determined via both electrochemical methods giving consistent values of ca. 2.5. The Royal Society of Chemistry 2022-01-10 /pmc/articles/PMC8809411/ /pubmed/35222919 http://dx.doi.org/10.1039/d1sc06122d Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Lu, Yuanyuan Li, Xiuting Compton, Richard G. Electro-oxidation of amino-functionalized multiwalled carbon nanotubes |
title | Electro-oxidation of amino-functionalized multiwalled carbon nanotubes |
title_full | Electro-oxidation of amino-functionalized multiwalled carbon nanotubes |
title_fullStr | Electro-oxidation of amino-functionalized multiwalled carbon nanotubes |
title_full_unstemmed | Electro-oxidation of amino-functionalized multiwalled carbon nanotubes |
title_short | Electro-oxidation of amino-functionalized multiwalled carbon nanotubes |
title_sort | electro-oxidation of amino-functionalized multiwalled carbon nanotubes |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8809411/ https://www.ncbi.nlm.nih.gov/pubmed/35222919 http://dx.doi.org/10.1039/d1sc06122d |
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