The DOI matches its Crossref record; 25 of the 25 references it cites were found in a registry or an index.
Graphene Oxide. Origin of Acidity, Its Instability in Water, and a New Dynamic Structural Model
Abstract
The existing structural models of graphene oxide (GO) contradict each other and cannot adequately explain the acidity of its aqueous solutions. Inadequate understanding of chemical structure can lead to a misinterpretation of observed experimental phenomena. Understanding the chemistry and structure of GO should enable new functionalization protocols while explaining GO's limitations due to its water instability. Here we propose an unconventional view of GO chemistry and develop the corresponding "dynamic structural model" (DSM). In contrast to previously proposed models, the DSM considers GO as a system, constantly changing its chemical structure due to interaction with water. Using potentiometric titration, (13)C NMR, FTIR, UV-vis, X-ray photoelectron microscopy, thermogravimetric analysis, and scanning electron microscopy we show that GO does not contain any significant quantity of preexisting acidic functional groups, but gradually generates them through interaction with water. The reaction with water results in C-C bond cleavage, formation of vinylogous carboxylic acids, and the generation of protons. An electrical double layer formed at the GO interface in aqueous solutions plays an important role in the observed GO chemistry. Prolonged exposure to water gradually degrades GO flakes converting them into humic acid-like structures. The proposed DSM provides an explanation for the acidity of GO aqueous solutions and accounts for most of the known spectroscopic and experimental data.
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Metadata
- Authors
- Dimiev, A. M., Alemany, L. B., & Tour, J. M.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-12-14
- Volume
- 7
- Issue
- 1
- Pages
- 576-588
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2333319526
- Cited by
- 666
- References
- 25
- FWCI
- 16.22
- Type
- journal article
- Language
- en
- Open access
- closed
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