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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...

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Detalles Bibliográficos
Autores principales: Lu, Yuanyuan, Li, Xiuting, Compton, Richard G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2022
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.
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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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