Graphene in Water is Hardly Ever Neutral
Abstract Graphene in water is electrically charged in most conditions. The level of charge can be large enough to stabilize single (or few) layer graphene colloidal dispersions in water, without the need of using any other additive. In this work, potentiometric titration, isothermal titration calorimetry, electrokinetic measurements, Density Functional Theory calculations, Raman Spectroscopy, and direct force measurements using Atomic Force Microscopy to investigate this charge and explore its origin are combined. The body of data collected suggests that this charge is a consequence of the interaction between water ions (hydroxide and hydronium) and graphene, and can be conveniently tuned (in magnitude and sign) by changing the pH of water.
Authors
- Jordi Faraudo (ORCID: https://orcid.org/0000-0002-6315-4993)
- Gilles Pécastaings (ORCID: https://orcid.org/0000-0002-9109-6225)
- Alain Pénicaud (ORCID: https://orcid.org/0000-0001-8614-2867)
- Christine Labrugère‐Sarroste (ORCID: https://orcid.org/0000-0003-1755-917X)
- Carlos Drummond (ORCID: https://orcid.org/0000-0003-4834-3259)
- Luna Boulbet‐Friedelmeyer
Institutions
- Centre National de la Recherche Scientifique (FR)
- Université de Bordeaux (FR)
- Institut de Ciència de Materials de Barcelona (ES)
- Centre de recherche Paul Pascal (FR)
Publication Details
- Journal
- Advanced Science
- Published
- 2024-08-19
- DOI
- https://doi.org/10.1002/advs.202403760
- Citations
- 3
- Primary Topic
- Electrochemical Analysis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.52
Funders
- European Commission
- Agence Nationale de la Recherche
- Association Nationale de la Recherche et de la Technologie
- HORIZON EUROPE Framework Programme
- Agència de Gestió d'Ajuts Universitaris i de Recerca
- Agencia Estatal de Investigación