The DOI matches its Crossref record; 4 of the 4 references it cites were found in a registry or an index.
Understanding Aqueous Dispersibility of Graphene Oxide and Reduced Graphene Oxide through p Ka Measurements
Abstract
The chemistry underlying the aqueous dispersibility of graphene oxide (GO) and reduced graphene oxide (r-GO) is a key consideration in the design of solution processing techniques for the preparation of processable graphene sheets. Here, we use zeta potential measurements, pH titrations, and infrared spectroscopy to establish the chemistry underlying the aqueous dispersibility of GO and r-GO sheets at different values of pH. We show that r-GO sheets have ionizable groups with a single pK value (8.0) while GO sheets have groups that are more acidic (pK = 4.3), in addition to groups with pK values of 6.6 and 9.0. Infrared spectroscopy has been used to follow the sequence of ionization events. In both GO and r-GO sheets, it is ionization of the carboxylic groups that is primarily responsible for the build up of charge, but on GO sheets, the presence of phenolic and hydroxyl groups in close proximity to the carboxylic groups lowers the pKa value by stabilizing the carboxylate anion, resulting in superior water dispersibility .
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Cites
Geim, A. K., & Novoselov, K. S. (2007) · Nature Materials · doi:10.1038/nmat1849 · Cited by 39,979
Graphene: Status and Prospects
Geim, A. K. (2009) · Science · doi:10.1126/science.1158877 · Cited by 13,942
Graphene-based composite materials
Stankovich, S., Dikin, D. A., Dommett, G. H. B., Kohlhaas, K. M., Zimney, E. J., Stach, E. A., Piner, R. D., Nguyen, S. T., & Ruoff, R. S. (2006) · Nature · doi:10.1038/nature04969 · Cited by 12,922
The chemistry of graphene oxide
Dreyer, D. R., Park, S., Bielawski, C. W., & Ruoff, R. S. (2010) · Chem. Soc. Rev. · doi:10.1039/b917103g · Cited by 11,653
Cited by
Brisebois, P. P., & Siaj, M. (2020) · Journal of Materials Chemistry C · doi:10.1039/c9tc03251g · Cited by 445
Ghodake, G. S., Shinde, S. K., Kadam, A. A., Saratale, R. G., Saratale, G. D., Kumar, M., Palem, R. R., AL-Shwaiman, H. A., Elgorban, A. M., Syed, A., et al. (2021) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2021.126645 · Cited by 414
Konkena, B., Masa, J., Botz, A. J. R., Sinev, I., Xia, W., Koßmann, J., Drautz, R., Muhler, M., & Schuhmann, W. (2017) · ACS Catalysis · doi:10.1021/acscatal.6b02203 · Cited by 292
Self-citationQin, C., Wang, H., Yuan, X., Xiong, T., Zhang, J., & Zhang, J. (2020) · Chemical Engineering Journal · doi:10.1016/j.cej.2019.122977 · Cited by 205
Principles governing control of aggregation and dispersion of aqueous graphene oxide
Suter, J. L., & Coveney, P. V. (2021) · Scientific Reports · doi:10.1038/s41598-021-01626-3 · Cited by 70
Metadata
- Authors
- Konkena, B., & Vasudevan, S.
- Venue
- The Journal of Physical Chemistry Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-03-15
- Volume
- 3
- Issue
- 7
- Pages
- 867-872
- ISSN
- 1948-7185 (ISSN-L)
- OpenAlex
- W2042885362
- Cited by
- 904
- References
- 4
- FWCI
- 15.20
- Type
- journal article
- Language
- en
- Open access
- closed
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