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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/15927

Title: Carbon nanoparticle surface functionalisation: converting negatively charged sulfonate to positively charged sulfonamide
Authors: Watkins, John D.
Lawrence, Ruth
Taylor, James E.
Bull, Steven D.
Nelson, Geoffrey W.
Foord, John S.
Wolverson, Daniel
Rassaei, Liza
Evans, Nicholas D.M.
Gascon, Silvia Anton
Marken, Frank
Issue Date: 2010
Publisher: Royal Society of Chemistry / © Owner Societies
Citation: WATKINS, J.D. ... et al, 2010. Carbon nanoparticle surface functionalisation: converting negatively charged sulfonate to positively charged sulfonamide. Physical Chemistry Chemical Physics, 12 (18), pp. 4872 - 4878.
Abstract: The surface functionalities of commercial sulfonate-modified carbon nanoparticles (ca. 9–18 nm diameter, Emperor 2000) have been converted from negatively charged to positively charged via sulfonylchloride formation followed by reaction with amines to give suphonamides. With ethylenediamine, the resulting positively charged carbon nanoparticles exhibit water solubility (in the absence of added electrolyte), a positive zeta-potential, and the ability to assemble into insoluble porous carbon films via layer-by-layer deposition employing alternating positive and negative carbon nanoparticles. Sulfonamide-functionalised carbon nanoparticles are characterised by Raman, AFM, XPS, and voltammetric methods. Stable thin film deposits are formed on 3 mm diameter glassy carbon electrodes and cyclic voltammetry is used to characterise capacitive background currents and the adsorption of the negatively charged redox probe indigo carmine. The Langmuirian binding constant K = 4000 mol−1dm3 is estimated and the number of positively charged binding sites per particle determined as a function of pH.
Description: This article was published in the journal, Physical Chemistry Chemical Physics [Royal Society of Chemistry / © Owner Societies ]. The definitive version is available at: http://dx.doi.org/10.1039/b927434k
Sponsor: J.D.W. and L.R. thank the EPSRC for financial support.
Version: Accepted for publication
DOI: 10.1039/b927434k
URI: https://dspace.lboro.ac.uk/2134/15927
Publisher Link: http://dx.doi.org/10.1039/b927434k
ISSN: 1463-9076
Appears in Collections:Published Articles (Chemistry)

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