Sodium Hypochlorite and Sodium Bromide Individualized and Stabilized Carbon Nanotubes in Water

Abstract
Aggregation is a major problem for hydrophobic carbon nanomaterials such as carbon nanotubes (CNTs) in water because it reduces the effective particle concentration, prevents particles from entering the medium, and leads to unstable electronic device performances when a colloidal solution is used. Molecular ligands such as surfactants can help the particles to disperse, but they tend to degrade the electrical properties of CNTs. Therefore, self-dispersed particles without the need for surfactant are highly desirable. We report here, for the first time to our knowledge, that CNT particles with negatively charged hydrophobic/water interfaces can easily self-disperse themselves in water via pretreating the nanotubes with a salt solution with a low concentration of sodium hypochlorite (NaClO) and sodium bromide (NaBr). The obtained aqueous CNT suspensions exhibit stable and superior colloidal performances. A series of pH titration experiments confirmed the presence and role of the electrical double layers on the surface of the salted carbon nanotubes and of functional groups and provided an in-depth understanding of the phenomenon.

Citation
Xu X, Zhou J, Colombo V, Xin Y, Tao R, et al. (2017) Sodium Hypochlorite and Sodium Bromide Individualized and Stabilized Carbon Nanotubes in Water. Langmuir. Available: http://dx.doi.org/10.1021/acs.langmuir.7b00850.

Acknowledgements
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). We thank KAUST for its continuous support.

Publisher
American Chemical Society (ACS)

Journal
Langmuir

DOI
10.1021/acs.langmuir.7b00850

PubMed ID
28930637

Additional Links
http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.7b00850

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