A new protocol for the carboxylic acid sidewall functionalization of single-walled carbon nanotubes

A facile approach toward preparation of sulfonated multi-walled carbon nanotubes and their dispersibility in various solvents

“…Therefore, a lot of efforts have been made to optimize the use of CNTs in various applications by attaching functional groups on their surfaces. Now, these functional groups usually are carboxyl [8] , hydroxyl [9], amines [10], sulfonic acid groups [6,7], aryl diazonium salt [11], halogens [12] and so on. Among these functional groups attached to CNTs, the introduction of sulfonic acid groups on the CNTs attracts numerous research interest because of its good stability, considerable solubility, strong surface acidity and their potential applications in solid acid catalysts and catalyst support [6,7].…”

Spectroscopic studies on sidewall carboxylic acid functionalization of multi-walled carbon nanotubes with valine

“…The researchers are still far from considering CNTs as entities easy to integrate into organic, inorganic, or biological systems. One of the most powerful approaches to improve CNTs handling is the carboxylic acid functionalization of their sidewalls, which enables chemical bonding between the MWCNTs and the material of interest [22]. The mixture of sulfuric acid/nitric acid or nitric acid can be used to form carboxylic acid groups on the surface of CNTs.…”

Preparation and characterization of multi‐walled carbon nanotubes decorated with silver nanoparticles through ultraviolet irradiation reduction

“…There are many ways to introduce carboxylic groups on the surface of CNTs. The major routes are covalent modification including oxidation and grafting . But grafting modification introduces a polymer on the CNTs, which would restrict their application, for example, in the fiber field because of the requirement for spinnability.…”