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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
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 (Dr Stuart Thickett)
ID Code:145191
Year Published:2021
Deposited By:Chemistry
Deposited On:2021-07-08
Last Modified:2021-09-28
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