Hydrothermal Wrapping Introduces Functionality draft accepted.pdf (660.37 kB)
"Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials
journal contribution
posted on 2014-09-26, 13:26 authored by Katherine Lawrence, Geoffrey W. Nelson, John S. Foord, Monica Felipe-Sotelo, Nick Evans, John M. Mitchels, Tony D. James, Fengjie Xia, Frank MarkenNegatively charged carbon nanoparticles (surface-phenylsulfonated) are “wrapped” in a poly(4-vinylpyridine) cationomer and hydrothermally converted into a pH-responsive core–shell nano-composite. With a “thin shell” this nano-material (ca. 20–40 nm diameter) is water-insoluble but readily dispersed into ethanol and deposited onto electrodes. Zeta-potential measurements suggest a point of zero charge (PZC) at ca. pH 4.5 with negative functional groups dominating in the more alkaline range and positive functional groups dominating in the acidic range. XPS data suggest carboxylate and pyridinium-like functional groups. This is further confirmed in voltammetric measurements for adsorbed cations (methylene blue) and adsorbed anions (indigo carmine). The specific capacitance reaches a maximum of 13 F g−1 at the PZC explained here tentatively by a “shell charging” effect within the nanoparticle shell.
Funding
K.L. thanks the EPSRC for a DTA studentship to fund this research. This work was also supported by the CSC (China Scholarship Council, file number 2010695033) for F.X.
History
School
- Science
Department
- Chemistry
Published in
JOURNAL OF MATERIALS CHEMISTRY AVolume
1Issue
14Pages
4559 - 4564 (6)Citation
LAWRENCE, K. ... et al, 2013. "Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials. Journal of Materials Chemistry A, 1 (14), pp. 4559 - 4564.Publisher
© Royal Society of ChemistryVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2013Notes
This article was published in the serial, Journal of Materials Chemistry A [© Royal Society of Chemistry]. The definitive version is available at: http://dx.doi.org/10.1039/c3ta10198cISSN
2050-7488Publisher version
Language
- en