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Monitoring oxidationof multiwalled carbonnanotubes by Ramanspectroscopy Sebastian OsswaldMickaël HavelYury Gogotsi2007 год

Monitoring oxidation of multiwalled carbon nanotubes by Raman spectroscopy
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Аннотация: Abstract Multiwalled carbon nanotubes (MWCNTs) were oxidized in air and acids while varying the treatment time and/or temperature. The goal of this approach was to create the highest density of carboxyl groups with moderate sample loss, which is necessary for nanocomposite applications. In situ Raman experiments allowed real‐time observation of the structural changes in MWCNTs upon oxidation. The ratio of the Raman intensities of the D and G bands was used to estimate the concentration of defects. It was found that while an oxidation for 6 h in H 2 SO 4 /HNO 3 provided the strongest effect, a ‘flash oxidation’ in air (15 min at 550 °C) also leads to an efficient functionalization in a cost‐effective and environmentally friendly way. Transmission electron microscopy, Fourier‐transform infrared (FTIR) spectroscopy, thermogravimetric analysis and electrophoretic mobility analysis were used to study the oxidized nanotubes. Copyright © 2007 John Wiley & Sons, Ltd.
Год издания: 2007
Авторы: Sebastian Osswald, Mickaël Havel, Yury Gogotsi
Издательство: Wiley
Источник: Journal of Raman Spectroscopy
Ключевые слова: Carbon Nanotubes in Composites, Graphene research and applications, Diamond and Carbon-based Materials Research