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Thermal Decomposition of Ternary Sodium Graphite Intercalation Compounds

Graphite intercalation compounds (GICs) are often used to produce exfoliated or functionalised graphene related materials (GRMs) in a specific solvent. This study explores the formation of the Na‐tetrahydrofuran (THF)‐GIC and a new ternary system based on dimethylacetamide (DMAc). Detailed compariso...

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Autores principales: Au, Heather, Rubio, Noelia, Buckley, David J., Mattevi, Cecilia, Shaffer, Milo S. P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317426/
https://www.ncbi.nlm.nih.gov/pubmed/32142591
http://dx.doi.org/10.1002/chem.202000422
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author Au, Heather
Rubio, Noelia
Buckley, David J.
Mattevi, Cecilia
Shaffer, Milo S. P.
author_facet Au, Heather
Rubio, Noelia
Buckley, David J.
Mattevi, Cecilia
Shaffer, Milo S. P.
author_sort Au, Heather
collection PubMed
description Graphite intercalation compounds (GICs) are often used to produce exfoliated or functionalised graphene related materials (GRMs) in a specific solvent. This study explores the formation of the Na‐tetrahydrofuran (THF)‐GIC and a new ternary system based on dimethylacetamide (DMAc). Detailed comparisons of in situ temperature dependent XRD with TGA‐MS and Raman measurements reveal a series of dynamic transformations during heating. Surprisingly, the bulk of the intercalation compound is stable under ambient conditions, trapped between the graphene sheets. The heating process drives a reorganisation of the solvent and Na molecules, then an evaporation of the solvent; however, the solvent loss is arrested by restacking of the graphene layers, leading to trapped solvent bubbles. Eventually, the bubbles rupture, releasing the remaining solvent and creating expanded graphite. These trapped dopants may provide useful property enhancements, but also potentially confound measurements of grafting efficiency in liquid‐phase covalent functionalization experiments on 2D materials.
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spelling pubmed-73174262020-06-30 Thermal Decomposition of Ternary Sodium Graphite Intercalation Compounds Au, Heather Rubio, Noelia Buckley, David J. Mattevi, Cecilia Shaffer, Milo S. P. Chemistry Full Papers Graphite intercalation compounds (GICs) are often used to produce exfoliated or functionalised graphene related materials (GRMs) in a specific solvent. This study explores the formation of the Na‐tetrahydrofuran (THF)‐GIC and a new ternary system based on dimethylacetamide (DMAc). Detailed comparisons of in situ temperature dependent XRD with TGA‐MS and Raman measurements reveal a series of dynamic transformations during heating. Surprisingly, the bulk of the intercalation compound is stable under ambient conditions, trapped between the graphene sheets. The heating process drives a reorganisation of the solvent and Na molecules, then an evaporation of the solvent; however, the solvent loss is arrested by restacking of the graphene layers, leading to trapped solvent bubbles. Eventually, the bubbles rupture, releasing the remaining solvent and creating expanded graphite. These trapped dopants may provide useful property enhancements, but also potentially confound measurements of grafting efficiency in liquid‐phase covalent functionalization experiments on 2D materials. John Wiley and Sons Inc. 2020-04-07 2020-05-20 /pmc/articles/PMC7317426/ /pubmed/32142591 http://dx.doi.org/10.1002/chem.202000422 Text en © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
Au, Heather
Rubio, Noelia
Buckley, David J.
Mattevi, Cecilia
Shaffer, Milo S. P.
Thermal Decomposition of Ternary Sodium Graphite Intercalation Compounds
title Thermal Decomposition of Ternary Sodium Graphite Intercalation Compounds
title_full Thermal Decomposition of Ternary Sodium Graphite Intercalation Compounds
title_fullStr Thermal Decomposition of Ternary Sodium Graphite Intercalation Compounds
title_full_unstemmed Thermal Decomposition of Ternary Sodium Graphite Intercalation Compounds
title_short Thermal Decomposition of Ternary Sodium Graphite Intercalation Compounds
title_sort thermal decomposition of ternary sodium graphite intercalation compounds
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7317426/
https://www.ncbi.nlm.nih.gov/pubmed/32142591
http://dx.doi.org/10.1002/chem.202000422
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