Journal
ACS NANO
Volume 4, Issue 12, Pages 7379-7386Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn1022523
Keywords
carbon nanotube; chemical functionalization; X-ray photoelectron spectroscopy; thermogravimetry; scanning tunneling microscopy
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Funding
- Portuguese Foundation for Science and Technology [POCI/QUI/59835/2004, SFRH/BD/32189/2006, SFRH/BD/39119/2007]
- program for New Century Excellent Talents in University [NCET-10-0607]
- iNANO center from the Danish Research Societies
- Villum Kahn Foundation
- Carlsberg Foundation
- European Research Council
- Fundação para a Ciência e a Tecnologia [SFRH/BD/32189/2006, POCI/QUI/59835/2004, SFRH/BD/39119/2007] Funding Source: FCT
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The present work reports the solvent-free, one-pot functionalization of multiwall carbon nanotubes (CNTs) based on the 1,3-dipolar cycloaddition of azomethine ylides using N-benzyloxycarbonyl glycine and formaldehyde. The surface morphology of the functionalized CNTs was investigated by scanning tunneling microscopy. The effect of temperature on the reaction was studied by thermogravimetry and X-ray photoelectron spectroscopy (XPS). XPS was a key technique for the detailed chemical analysis of the CNT surface. The formation of two major reaction products was observed, namely a cyclic benzyl carbamate and a pyrrolidine. The concentration of the two products varied with reaction temperature and time. At 180 degrees C, the main product was the cyclic benzyl carbamate, while at 250 degrees C the major product was the pyrrolidine. This simple, solvent-free chemical procedure yields CNTs with fine-tuned surface functionality.
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