Details

Autor(en) / Beteiligte

• Ros, Tijmen G.
• van Dillen, Adrianus J.
• Geus, John W.
• Koningsberger, Diederik C.

Titel

Surface Oxidation of Carbon Nanofibres

Ist Teil von

• Chemistry : a European journal, 2002-03, Vol.8 (5), p.1151-1162

Ort / Verlag

Weinheim: WILEY-VCH Verlag GmbH

Erscheinungsjahr

2002

Link zum Volltext

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• Carbon nanofibres of the fishbone and parallel types were surface‐oxidised by several methods. The untreated and oxidised fibres were studied with infrared spectroscopy, thermogravimetric analysis and X‐ray photoelectron spectroscopy (XPS). Oxidation in a mixture of concentrated nitric and sulfuric acids proved to be the most effective method for creating oxygen‐containing surface groups. This treatment results not only in the formation of carboxy and carboxyic anhydride groups, but also in the generation of ether‐type oxygen groups between graphitic layers that are puckered at their edges. The IR spectroscopic data clearly show that the formation of oxygen‐containing surface groups occurs at defect sites on the carbon nanofibres and that oxidation proceeds via carbonyl groups and other oxides to carboxy and carboxyic anhydride groups. Owing to the presence of defects, the two types of fibre have similar surface reactivities. With parallel nanofibres, in contrast to fishbone fibres, the macroscopic structure was severely affected by treatment with HNO3/H2SO4. The HNO3/H2SO4‐treated fibres are highly wettable by water. Defects in the graphitic structure are the sites of surface oxidation in carbon nanofibres according to IR studies on surface‐oxidised samples. The IR spectrum (see picture) shows bands for O‐containing surface species at 1754 and 1716 cm−1. Parallel and fishbone fibres have about the same reactivity towards surface oxidation.