Diameter-selective non-covalent functionalization of carbon nanotubes with porphyrin monomers.

Abstract : We report on the spontaneous noncovalent functionalization of carbon nanotubes with hydropho-bic porphyrin molecules in micellar aqueous solution. By monitoring the species concentrations with optical spectroscopies, we can follow the kinetics of the reaction and study its thermodynamical equilibrium as a function of the reagent concentrations. We show that the reaction is well accounted for by a cooperative Hill equation, reaching a molecular coverage close to a compact monolayer for a porphyrin concentration larger than a diameter-specific threshold concentration. The equilibrium constant is measured for 16 nanotube chiral species. The Gibbs energy of the reaction (of the order of-40 kJ/mol) and its evolution with the nanotube diameter is consistent with theoretical calculations of the binding energy. This thermodynamical study shows a strong preferential binding of TPP molecules to larger diameter nanotubes. This original curvature selectivity can be used to induce diameter selective species enrichment.
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Nanoscale, Royal Society of Chemistry, 2016, 8, pp.2326. <10.1039/C5NR08023A>
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Dernière modification le : vendredi 17 février 2017 - 16:13:07
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F Vialla, G Delport, Y Chassagneux, Ph Roussignol, Jean-Sébastien Lauret, et al.. Diameter-selective non-covalent functionalization of carbon nanotubes with porphyrin monomers.. Nanoscale, Royal Society of Chemistry, 2016, 8, pp.2326. <10.1039/C5NR08023A>. <hal-01250180>

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