Regensburg 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)
O 44.23: Poster
Mittwoch, 28. März 2007, 17:00–19:30, Poster C
Characterisation of multi-wall carbon nanotubes functionalised with carboxyl groups — •Marcel Himmerlich, Uwe Ritter, Henry Romanus, Juergen A. Schaefer, Peter Scharff, and Stefan Krischok — Institut für Physik und Institut für Mikro- und Nanotechnologien, TU Ilmenau, P.O. Box 100565, 98684 Ilmenau, Germany
The impact of nitric acid (HNO3) treatment on the structure, surface composition and surface electronic structure of multi-wall carbon nanotubes (MWCNTs) is investigated employing scanning electron microscopy (SEM) and transmission electron microscopy (TEM) as well as X-ray and ultraviolet photoelectron spectroscopy (XPS, UPS) together with electron energy loss spectroscopy (EELS). The investigated MWCNTs have been synthesised at 900∘C by spray pyrolysis using benzene and 1% ferrocene in an Argon flow. After subsequent purification the samples were functionalised by a treatment with nitric acid at 100∘C for 2 h. The valence band structures of functionalised and unfunctionalised samples are compared to reference measurements on formic acid (HCOOH) and polyacrylic acid. The analysis of the C1s and O1s core levels together with the observed differences in the valence band structure reveals the formation of carboxyl (-COOH) groups on the nanotubes. TEM measurements indicate that the main reaction takes place at the end of the nanotubes resulting in a cracking of the MWCNT end caps.