Selective Grafting of Primary Amines onto Carbon Nanotubes via Free-Radical Treatment in Microwave Plasma Post-Discharge
| Autor: | Michel Hecq, Philippe Dubois, Benoit Ruelle, Carla Bittencourt, Sophie Peeterbroeck, Rony Snyders, N. Copernic, Thomas Godfroid |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Materials science
atomic nitrogen Polymers and Plastics Hydrogen carbon nanotubes Inorganic chemistry chemistry.chemical_element General Chemistry Carbon nanotube Grafting Nitrogen law.invention primary amine grafting lcsh:QD241-441 chemistry.chemical_compound microwave plasma chemistry X-ray photoelectron spectroscopy lcsh:Organic chemistry law XPS Amine gas treating Selectivity Derivatization |
| Zdroj: | Polymers, Vol 4, Iss 1, Pp 296-315 (2012) Polymers Volume 4 Issue 1 Pages: 296-315 |
| ISSN: | 2073-4360 |
| Popis: | A novel strategy to graft functional groups at the surface of carbon nanotubes (CNTs) is discussed. Aiming at grafting nitrogen containing groups, and more specifically primary amine covalent functionalization, CNTs were exposed under atomic nitrogen flow arising from an Ar + N2 microwave plasma. The primary amine functions were identified and quantified through chemical derivatization with 4-(trifluoromethyl)benzaldehyde and characterized through X-ray photoelectron spectroscopy. The increase of the selectivity in the primary amines grafting onto CNTs, up to 66.7% for treatment of CNT powder, was performed via the reduction of post-treatment oxygen contamination and the addition of hydrogen in the experimental set-up, more particularly in the plasma post-discharge chamber. The analyses of nitrogenated and primary amine functions grafting on the CNT surface suggest that atomic nitrogen (N•) and reduced nitrogen species (NH• and NH2•) react preferentially with defect sites of CNTs and, then, only atomic nitrogen continues to react on the CNT surface, creating defects. |
| Databáze: | OpenAIRE |
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