Carbon nanotube-Cu hybrids enhanced catalytic activity in aqueous media

Abstract

In this work, we report the synthesis of a hybrid material, consisting of Cu nanoparticles (Cu-NPs) anchored on the surface of carbon nanotubes (CNTs), which is able to increase the catalytic behavior when compared to bare CuNPs. This enhanced activity was evalu-ated by the electrophoretic separation of three carbohydrates: sucrose, glucose and fruc-tose. CNTs were first synthesized in the presence of minute amounts of oxygen, oxidized using H 2 O 2 -UV radiation and then decorated with Cu-NPs. The resulting hybrid structure was confirmed and characterized by X-ray photoelectron spectroscopy, transmission elec-tron microscopy, high resolution transmission electron energydispersive X-ray spectros-copy, titration, thermogravimetric analysis, elemental analysis and Raman spectroscopy.

Recent Trends in Nanomaterials‐Based Colorimetric Detection of Pathogenic Bacteria and Viruses

“…[52] When hybridized with other NMs, the high conductivity of CNTs and graphene significantly enhances catalytic activity. [53,54] Among various NMs, Au NPs are one of the most widely used NMs hybridized with CNTs or graphene due to their unique optical properties and peroxidase-mimicking activities. [55] The use of CNT or graphene hybridized with Au NPs showed further improved colorimetric-sensing performance.…”

“…In particular, CNTs and graphene have received much attention for biosensor applications due to their outstanding electrical properties, based on high surface area and great electron mobility . When hybridized with other NMs, the high conductivity of CNTs and graphene significantly enhances catalytic activity . Among various NMs, Au NPs are one of the most widely used NMs hybridized with CNTs or graphene due to their unique optical properties and peroxidase‐mimicking activities .…”

Evaluating the biological risk of functionalized multiwalled carbon nanotubes and functionalized oxygen-doped multiwalled carbon nanotubes as possible toxic, carcinogenic, and embryotoxic agents

“…Defects in nanotubes are any alteration of the graphitic lattice, including exohedral, endohedral, and in-plane doping; they are common in the CNTs synthetized by the present method 38 and have been well characterized elsewhere. [39][40][41]52 An atomistic difference between MWNTs and COxs is difficult to appreciate by SEM and TEM, since, as discussed by Botello-Méndez et al, 39 Shabestari et al, 40 and González et al, 52 the meaning of oxygen doping is the formation of different atomic alterations in the graphene layers as carbon-oxygen bonds (eg, by the use of X-ray photoelectron spectroscopy) 52 present the percentage of carbon atoms in graphitic or aliphatic bonds or as part of functional groups such as alcohol, lactones, and carboxyl. This functional group makes COx slightly more reactive than nondoped or MWCNTs.…”

“…52 In this study, the disorder is necessary to make the nanotubes hydrophilic and dissolve them in water solutions. Furthermore, TGA was performed in both samples.…”

Effect of nitrogen and oxygen doped carbon nanotubes on flammability of epoxy nanocomposites

“…Up to know, numerous applications of CN x have been reported: field emission devices [30], sensors [8], catalysts [31], electrocatalysts for oxygen reduction reaction [32], and batteries [33]. CO x has also been pre-pared and studied [34] and interesting applications as catalysts for electrophoresis have been reported [35]. Chemical functionaliza-tion of CNTs to obtain CN x and CO x is the strategy explored in this paper to increase polymer-nanotube interaction which leads to the enhanced dispersion state of the functionalized CNTs.…”