Abstract
Graphene has attracted intensive research interest in many fields, owing to its remarkable physicochemical properties. Nevertheless, its low dispersibility in most organic solvents and in water, and its tendency to aggregate, prevent full exploitation of its properties. Graphene oxide (GO) is an alternative material that exhibits high dispersibility in polar solvents. GO contains abundant oxygen-containing groups, mainly epoxide and hydroxy groups, which can be further chemically derivatized. However, because of GO’s high reactivity, several reactions may occur simultaneously, often leading to uncontrolled GO derivatives. Moreover, because GO can be easily reduced, functionalization should be performed under mild conditions. In this Review, we discuss the chemical reactivity of GO and explore issues that hamper precise control of its functionalization, such as its instability, the lack of a well-defined chemical structure and the presence of impurities. We focus on strategies for the selective derivatization of the oxygenated groups and C=C bonds, along with the challenges for unambiguous characterization of the resulting structures. We briefly review applications of GO materials, relating their chemistry and nanostructure to desired physical properties and function, and chart future directions for improving the control of GO chemistry.
Key points
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Graphene oxide (GO) contains abundant oxygenated groups, mainly epoxide and hydroxy groups on the basal plane, with a small number of carboxyl moieties at the edges.
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The functionalization of GO must be performed under mild conditions to avoid dehydration and reduction, which can occur upon heating or in the presence of a strong base.
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The high reactivity of the different oxygenated groups gives rise to potential side reactions and, thus, uncontrolled GO chemical structures. Chemoselective reactions are, therefore, crucial in controlling the derivatization of GO.
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Unambiguous characterization of GO is challenging. The conjugation of elements or functional groups that can be unambiguously identified onto the surface of GO can facilitate characterization.
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The intrinsic properties of GO, including a high proton conductivity and water dispersibility, must be preserved after functionalization for some applications, such as proton-exchange membranes for fuel cells or membranes for water filtration.
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Acknowledgements
The authors gratefully acknowledge the support of the Centre National de la Recherche Scientifique (CNRS) and the International Center for Frontier Research in Chemistry (icFRC), as well as financial support from the Agence Nationale de la Recherche (ANR) through the Interdisciplinary Thematic Institute ITI-CSC via the IdEx Unistra (ANR-10-IDEX-0002) within the programme ‘Investissements d’Avenir’ and from the European Commission through the Graphene Flagship Core 3 project (award no. 881603). S. Garaj acknowledges support from the National Research Foundation, Prime Minister’s Office, Singapore, under the Competitive Research Program (award no. NRF-CRP13-2014-03) and from the Agency for Science, Technology and Research (A*STAR), Singapore, under its Advanced Manufacturing and Engineering (AME) Programmatic grant (award no. A18A9b0060). S. Guo is indebted to the Chinese Scholarship Council for supporting his PhD internship.
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C.M.-M. conceptualized the manuscript. S. Guo, S. Garaj and C.M.-M. wrote the initial draft. All authors edited the manuscript prior to submission.
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Nature Reviews Physics thanks S. Szunerits, E. V. Fernández-Pacheco and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Glossary
- Epoxide
-
Three-membered C–O–C ring that possesses considerable strain, making it highly reactive towards nucleophiles.
- Nucleophile
-
A species with an electron-rich atom that can donate an electron pair to form a new covalent bond.
- Chemoselective derivatization
-
The selective reaction of a chemical reagent with a specific functional group without affecting others.
- Multifunctionalization
-
Functionalization with multiple different functional groups; in the case of graphene oxide, this involves different oxygenated groups and/or the C=C bonds.
- Carbanion
-
A molecule in which the carbon atom is trivalent (linked to three substituents) and bears a negative charge.
- Electrophiles
-
Electron-poor species that have a high affinity for electrons and can form covalent bonds by accepting electrons from a nucleophile.
- Boronic acids
-
Trivalent boron-containing organic compounds with one alkyl or aryl substituent and two hydroxy groups.
- 1,2-Diols
-
Moiety with two hydroxy groups that occupy vicinal positions.
- 1,3-Diols
-
Moiety with two hydroxy groups separated by three carbon atoms.
- Michael addition
-
Nucleophilic addition reaction of a carbanion (or nucleophile) to an α,β-unsaturated carbonyl compound that contains an electron-withdrawing group.
- Wittig reaction
-
Reaction between an aldehyde or ketone with a triphenylphosphonium ylide, leading to the formation of an alkene.
- Nafion
-
A sulfonated tetrafluoroethylene-based fluoropolymer-copolymer with excellent proton conductivity.
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Guo, S., Garaj, S., Bianco, A. et al. Controlling covalent chemistry on graphene oxide. Nat Rev Phys 4, 247–262 (2022). https://doi.org/10.1038/s42254-022-00422-w
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DOI: https://doi.org/10.1038/s42254-022-00422-w
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