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Structural complexity of graphene oxide: the kirigami model
Citation
Rawal, A and Che Man, SH and Agarwal, V and Yao, Y and Thickett, SC and Zetterlund, PB, Structural complexity of graphene oxide: the kirigami model, ACS Applied Materials & Interfaces, 13, (15) pp. 18255-18263. ISSN 1944-8244 (2021) [Refereed Article]
Copyright Statement
© 2021 American Chemical Society
DOI: doi:10.1021/acsami.1c01157
Abstract
Investigation of highly oxidized graphene oxide (GO) by solid-state nuclear magnetic resonance (NMR) spectroscopy has revealed an exceptional level of hitherto undiscovered structural complexity. A number of chemical moieties were observed for the first time, such as terminal esters, furanic carbons, phenolic carbons, and three distinct aromatic and two distinct alkoxy carbon moieties. Quantitative one-dimensional (1D) and two-dimensional (2D) 13C{1H} NMR spectroscopy established the relative populations and connectivity of these different moieties to provide a consistent "local" chemical structure model. An inferred 2 nm GO sheet size from a very large (∼20%) edge carbon fraction by NMR analysis is at odds with the >20 nm sheet size determined from microscopy and dynamic light scattering. A proposed kirigami model where extensive internal cuts/tears in the basal plane provide the necessary edge sites is presented as a resolution to these divergent results. We expect this work to expand the fundamental understanding of this complex material and enable greater control of the GO structure.
Item Details
Item Type: | Refereed Article |
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Keywords: | graphene oxide structure, solid-state NMR, 2D NMR, 2D 13C-1H heteronuclear correlation NMR, kirigami, furanic carbons |
Research Division: | Chemical Sciences |
Research Group: | Macromolecular and materials chemistry |
Research Field: | Structure and dynamics of materials |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the chemical sciences |
UTAS Author: | Thickett, SC (Associate Professor Stuart Thickett) |
ID Code: | 145191 |
Year Published: | 2021 |
Web of Science® Times Cited: | 7 |
Deposited By: | Chemistry |
Deposited On: | 2021-07-08 |
Last Modified: | 2021-09-28 |
Downloads: | 0 |
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