Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties

Abstract Graphene Oxides (GO) typically contains different oxygen containing groups such as hydroxyl, carboxyl and epoxy, and reduced GO (r-GO) represents a family of material with diverse chemical properties. In an effort to understand how properties of r-GO change as GO is reduced, a stepwise redu...

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Autores principales:	Samar Azizighannad, Somenath Mitra
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/64420eacc7424a35a5fbbdd66f8be7ad
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spelling	oai:doaj.org-article:64420eacc7424a35a5fbbdd66f8be7ad2021-12-02T15:08:16ZStepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties10.1038/s41598-018-28353-62045-2322https://doaj.org/article/64420eacc7424a35a5fbbdd66f8be7ad2018-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-28353-6https://doaj.org/toc/2045-2322Abstract Graphene Oxides (GO) typically contains different oxygen containing groups such as hydroxyl, carboxyl and epoxy, and reduced GO (r-GO) represents a family of material with diverse chemical properties. In an effort to understand how properties of r-GO change as GO is reduced, a stepwise reduction of the same GO to r-GO containing different levels of oxygen was carried out, and their corresponding chemical and colloidal properties are reported. Starting with GO containing 49 percent oxygen, r-GOs containing 31, 19 and 9 percent oxygen were synthesized. The aqueous behavior in terms of solubility gradually decreased from 7.4 µg/ml for GO to nearly zero for r-GO with 9% oxygen, while dispersibility under sonication decreased from 8 to 2.5 µg/ml for the same samples. Hydrophobicity index as measured as the octanol water partition coefficient decreased from −3.89 to 5.2% as oxygen content dropped from 49 to 9%. Colloidal behavior was also dramatically affected by reduction, and critical coagulation concentration (CCC) dropped from 28 to 15 in presence of 0.5 mmole/l NaCl and from 6 to 2 in presence of 0.5 mmole/l MgCl2 as the oxygen in the original GO was reduced to 9%.Samar AzizighannadSomenath MitraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Samar Azizighannad Somenath Mitra Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties
description	Abstract Graphene Oxides (GO) typically contains different oxygen containing groups such as hydroxyl, carboxyl and epoxy, and reduced GO (r-GO) represents a family of material with diverse chemical properties. In an effort to understand how properties of r-GO change as GO is reduced, a stepwise reduction of the same GO to r-GO containing different levels of oxygen was carried out, and their corresponding chemical and colloidal properties are reported. Starting with GO containing 49 percent oxygen, r-GOs containing 31, 19 and 9 percent oxygen were synthesized. The aqueous behavior in terms of solubility gradually decreased from 7.4 µg/ml for GO to nearly zero for r-GO with 9% oxygen, while dispersibility under sonication decreased from 8 to 2.5 µg/ml for the same samples. Hydrophobicity index as measured as the octanol water partition coefficient decreased from −3.89 to 5.2% as oxygen content dropped from 49 to 9%. Colloidal behavior was also dramatically affected by reduction, and critical coagulation concentration (CCC) dropped from 28 to 15 in presence of 0.5 mmole/l NaCl and from 6 to 2 in presence of 0.5 mmole/l MgCl2 as the oxygen in the original GO was reduced to 9%.
format	article
author	Samar Azizighannad Somenath Mitra
author_facet	Samar Azizighannad Somenath Mitra
author_sort	Samar Azizighannad
title	Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties
title_short	Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties
title_full	Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties
title_fullStr	Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties
title_full_unstemmed	Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties
title_sort	stepwise reduction of graphene oxide (go) and its effects on chemical and colloidal properties
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/64420eacc7424a35a5fbbdd66f8be7ad
work_keys_str_mv	AT samarazizighannad stepwisereductionofgrapheneoxidegoanditseffectsonchemicalandcolloidalproperties AT somenathmitra stepwisereductionofgrapheneoxidegoanditseffectsonchemicalandcolloidalproperties
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Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties

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