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Structural complexity of graphene oxide: the kirigami model
journal contribution
posted on 2023-05-21, 00:33 authored by Rawal, A, Che Man, SH, Agarwal, V, Yao, Y, Stuart ThickettStuart Thickett, Zetterlund, PBInvestigation 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.
History
Publication title
ACS Applied Materials & InterfacesVolume
13Issue
15Pagination
18255-18263ISSN
1944-8244Department/School
School of Natural SciencesPublisher
American Chemical SocietyPlace of publication
United StatesRights statement
© 2021 American Chemical SocietyRepository Status
- Restricted