Journal
APPLIED SURFACE SCIENCE
Volume 357, Issue -, Pages 1355-1368Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2015.09.252
Keywords
Buckypaper; Multiwalled carbon nanotubes; Amines; Functionalization; Gas phase; Solvent free
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Funding
- National Autonomous University of Mexico [DGAPA-IN100815]
- National Council of Science and Technology of Mexico (CONACyT) [127299]
- CONACYT
- Erasmus Mundus Action 2 EURICA [2013-2587]
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We demonstrate the possibility of fast and efficient solvent-free functionalization of buckypaper (BP) mats prefabricated from oxidized multiwalled carbon nanotubes (MWCNTs-ox), by using three representative amines of different structure: one monofunctional aliphatic amine, octadecylamine (ODA), one monofunctional aromatic amine, 1-aminopyrene (AP), and one aromatic diamine, 1,5-diaminonaphthalene (DAN). The functionalization procedure, which relies on the formation of amide bonds with carboxylic groups of MWCNTs-ox, is performed at 150-180 degrees C under reduced pressure and takes about 4 h including auxiliary degassing. The amine-treated BP samples (BP-ODA, BP-AP and BP-DAN, respectively) were characterized by means of a variety of analytical techniques such as Fourier-transform infrared and Raman spectroscopy, thermogravimetric and differential thermal analysis, scanning and transmission electron microscopy, scanning helium ion microscopy, and atomic force microscopy. The highest amine content was found for BP-ODA, and the lowest one was observed for BP-DAN, with a possible contribution of non-covalently bonded amine molecules in all three cases. Despite of some differences in spectral and morphological characteristics for amine-functionalized BP samples, they have in common a dramatically increased stability in water as compared to pristine BP and, on the other hand, a relatively invariable electrical conductivity. (C) 2015 Elsevier B.V. All rights reserved.
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