New strategies for the chemical characterization of multi-walled carbon nanotubes and their derivatives

Abstract

Industrially relevant characterization of multi-walled carbon nanotubes (MWCNT) is still remaining a challenging task. The aim of this work is to show novel and fast concepts for the

New Strategy for Chemically Attachment of Imine Group on Multi-Walled Carbon Nanotubes Surfaces: Synthesis, Characterization and Study of DC Electrical Conductivity

“…The high thermal stability of MWCNT-NH 2 , which is related to the surface of nanotubes defects with very little amount of -NH 2 group (0.45%), has a similar behavior of MWCNT [25]. The degradation process of MWNT-NH 2 does not exhibit any step until 600˚C, which confirms the MWNT-NH 2 thermally stable [19].…”

Synthesis, characterization, and description of influences on the stabilizing activity of antioxidant-functionalized multi-walled carbon nanotubes

“…Characteristic for carbon nanotubes are the D and G band, where the D band at 1340 cm À1 originates from sp 3 -hybridized carbon and the G band (between 1500 and 1600 cm À1 ) from C@C bonds (sp 2 -hybridized carbon) [24]. Defects in the graphene structure thus lead to a higher ratio of D-band to G-band area (A D /A G ) [22,25]. The Raman spectra of pristine MWCNTs, MWCNT-COOH, and AO-functionalized [24].…”

Correlation of gas permeation and free volume in new and used high free volume thin film composite membranes

“…The aim of this acid treatment is to create the high density of carboxyl groups with moderate sample loss, dissolution of the catalysts and the removal of by-products (e.g., amorphous carbon). 19 Further reaction between the oxidized carbon nanotubes and thionyl chloride leads to the formation of carboxyl chloride groups, which are highly reactive and can further react with PEG to form esters and so result in the desired f-MWCNTs. The pristine and f-MWCNTs were characterized by ATR-FTIR, as shown in Figure 1.…”