Amino group introduction onto multiwall carbon nanotubes by NH3/Ar plasma treatment

Selective Grafting of Primary Amines onto Carbon Nanotubes via Free-Radical Treatment in Microwave Plasma Post-Discharge

“…However, among these nitrogenated functions, primary amines have attracted our attention because they can be used as initiation sites for promoting lactone ring-opening polymerization yielding polyester-grafted MWCNT nanohybrids [47]. The quantity of primary amine functions was determined after chemical derivatization with 4-(trifluoromethyl)benzaldehyde (TFBA) [38,48,49]. This technique was developed to selectively label surface functional groups of interest with molecules containing an element that is not present on the surface prior to the derivatization reaction.…”

“…However, these limits greatly hinder achieving a suitable and controlled functionalization of CNTs. Another possibility is to avoid the functionalization of CNTs directly inside or close to the plasma, where the density of energetic ions and electrons is very high and, instead, placing the CNTs outside the discharge production zone to reduce the detrimental effects associated with ion bombardment and irradiation [33,37,38]. In this approach, radicals play a key role in grafting functional moieties onto CNT surface.…”

Mild hydrothermal treatment to prepare highly dispersed multi-walled carbon nanotubes

“…Figure 1b presents the high-resolution C 1s spectra of pristine MWCNTs and the modified MWCNTs obtained by hydrothermal treatment in different KPS concentration. On the basis of the literature reports [7,[15][16][17][18], the overall C 1s peak was fitted by a superposition of five peaks (the K 2p peaks at 293.2 eV and 295.9 eV were taken into account during fitting, because it affected the area of C 1s spectrum). The main peak at 284.…”

Carbon Nanotubes Supported Metal Nanoparticles for the Applications in Proton Exchange Membrane Fuel Cells (PEMFCs)

“…Ar atoms and/or ions present in the plasma can also interact with the surfaces of MWCNTs creating active sites for further oxygen functionalization. Indeed, in some case, N-containing groups can also be formed on the surface of CNTs (Ruelle et al, 2008 andC. Chen et al, 2010).…”