Oxygen functionalisation of MWNT and their use as gas sensitive thick-film layers

Syntheses of Carbon Nanotube-Metal Oxides Composites; Adsorption and Photo-degradation

“…The successful in functionalization of the nanotubes is the first step to properly prepare the nanocomposite. 297 or microwave energy and water (Cuentas-Gallegos et al, 2006;Wang et al, 2009;Smith et al, 2009;Lu et al, 2008;Otvos et al, 2006;Aviles et al, 2009;Haydar et al, 2000;Peng et al, 2011;Ionescu et al, 2006;Hojati-Talemi & Simon, 2009). Treatment with different oxidizing agents might introduce different functional groups on the CNTs surface including alcoholic, carboxylic, aldehydic, ketonic, and esteric oxygenated functional groups, see Fig.1.…”

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

“…Besides being time efficient processes, the plasma treatments are also versatile techniques to tailor the CNT surface properties by the grafting of functional groups paving the way for subsequent chemical reactions like polymer grafting for example. The most common plasma treatments of CNTs consist of introducing them directly in the plasma discharge allowing to bind fluorine [24,25], oxygen [26][27][28] or nitrogen [29][30][31][32] containing functional groups. The excited species such as electrons, ions or radicals interact with the CNTs surface breaking the C=C bonds and promoting the grafting of functional groups on the created structure defects.…”

Imaging and Spectroscopy of Multiwalled Carbon Nanotubes during Oxidation: Defects and Oxygen Bonding

“…[3][4][5][6][7][8] The oxygen functional groups can convert the metallic CNTs into semiconducting, [9] improve the adhesive properties, or selectively functionalize the surface to meet the application demands. [10][11][12][13][14][15] In general, oxidation of C-based materials is a very complex process: formation of different oxygen functional groups and gasification to volatile CO and CO 2 products depend strongly on the reaction conditions and the structural characteristics of the material. For creation of optimal density of functional groups with a minimum material loss via gasification, the oxidation rate should be carefully controlled, considering the structural effect on the reactivity, for example, graphite is more stable than CNTs, [16] and in the particular case of CNTs the curved tips are more reactive than the walls.…”