Studies of oxidized carbon nanotubes in temperature range RT–630 °C by the infrared and electron spectroscopies

• Published in: Journal of alloys and compounds Vol. 505; no. 1; pp. 379 - 384
• Main Authors: Stobinski, L., Lesiak, B., Zemek, J., Jiricek, P., Biniak, S., Trykowski, G.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 27.08.2010; Elsevier
• Subjects: Carbon nanotubes; Chemical bonds; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Density; Electron spectroscopy; Electron states; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Functionalization; General studies of phase transitions; Infrared; Infrared spectroscopy; Materials science; Methods of electronic structure calculations; Multi wall carbon nanotubes; Multiwall carbon nanotubes; Nanoscale materials and structures: fabrication and characterization; Nanotubes; Order-disorder and statistical mechanics of model systems; Oxidation; Physics; Temperature modification; Multiwall carbon nanotubes; Infrared spectroscopy; Electron spectroscopy; Temperature modification; Functionalization; Temperature dependence; Order-disorder transformations; Moisture; Carbon nanotubes; Carbon; High vacuum; Surface reconstruction; Electronic structure; Multiwalled nanotube; Aqueous solutions; Hydroxyl group; Ordering; Oxidation; Nanostructured materials
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2010.05.185

The oxidized multiwall carbon nanotubes, their temperature modification in the range from RT to 630 °C are studied. The oxidation proceeds in aqueous solution of the concentrated HNO 3. The oxidized multiwall carbon nanotubes are investigated using the infrared and electron spectroscopy methods. The oxidation creates mainly carboxyl, hydroxyl and carbonyl groups attached to multiwall carbon nanotubes, which can be detected by the infrared spectroscopy and at the surface by the electron spectroscopy methods. Thermal modification under ultra-high vacuum conditions leads to decreasing content of water, oxygen and carbon groups proceeding with different rates, increasing content of C sp 2 bonds ( e.g. carbon nanotubes reconstruction), surface atoms ordering and changes of surface atomic density.