Discriminating the carboxylic groups from the total acidic sites in oxidized multi-wall carbon nanotubes by means of acid–base titration

descriptionPublicationkeyboard_double_arrow_right Article 01 Sep 2008 English Publisher:Elsevier BVJournal:Chemical Physics Letters, volume 462, pages 256-259 (issn: 0009-2614,

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Authors: González-Guerrero, Ana Belén; Mendoza Gómez, Ernest; Pellicer, Eva; Alzina, Francesc; Fernández Sánchez, César; Lechuga, Laura M.;

doi: 10.1016/j.cplett.2008.07.071

handle: 10261/31370

Discriminating the carboxylic groups from the total acidic sites in oxidized multi-wall carbon nanotubes by means of acid–base titration

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Abstract

This work reports on the quantitative determination of the carboxylic groups created upon HNO3 treatment at multi-wall carbon nanotube (MWCNT) surface. To this purpose, MWCNTs have been oxidized by refluxing in acid for different periods of time (from 1 h to 12 h). The main goal of the present study comprises the development of a simple analytical methodology based on Boehm’s titration that enables the rapid estimation of the total carboxylic groups and their discrimination from the total oxidized sites created at MWCNT surface as a result of the acid treatment. The trends observed are correlated with Raman spectroscopy analyses.

This work has been financially supported by the Explora project of the Ministerio de Educación y Ciencia (MEC) through MAT2006- 26540-E. E. Mendoza and C. Fernández-Sánchez acknowledge the MEC for the Ramon y Cajal contract.

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