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Title: "Hydrothermal wrapping" with poly(4-vinylpyridine) introduces functionality: pH-sensitive core-shell carbon nanomaterials
Authors: Lawrence, Katherine
Nelson, Geoffrey W.
Foord, John S.
Felipe-Sotelo, Monica
Evans, Nicholas D.M.
Mitchels, John M.
James, Tony D.
Xia, Fengjie
Marken, Frank
Issue Date: 2013
Publisher: © Royal Society of Chemistry
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.
Abstract: Negatively 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.
Description: 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/c3ta10198c
Sponsor: 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.
Version: Accepted for publication
DOI: 10.1039/c3ta10198c
URI: https://dspace.lboro.ac.uk/2134/15943
Publisher Link: http://dx.doi.org/10.1039/c3ta10198c
ISSN: 2050-7488
Appears in Collections:Published Articles (Chemistry)

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