Gas sensing properties of multiwall carbon nanotubes decorated with rhodium nanoparticles

Abstract

International audienceIn the present work, multiwalled carbon nanotubes were decorated with rhodium nanoparticles using a colloidal solution in the post-discharge of an RF atmospheric plasma of argon (Ar) or argon/oxygen (Ar:O 2). The properties of these hybrid materials towards the room temperature detection of NO 2 , C 2 H 4 , CO, C 6 H 6 and moisture were investigated and discussed in view of compositional and morphological studies. It was found that the presence of oxygen in the plasma treatment is essential to significantly enhance the gas response of Rh-decorated multiwalled carbon nanotubes and to avoid response saturation even at low gas/vapor concentrations. These desirable effects are attributed to the presence of oxygen during the CNT plasma treatment since oxygenated vacancies act both as active adsorption sites for gases and as anchoring sites for Rh nanoparticles (the presence of Rh nanoclusters is nearly doubled in Ar:O 2 treated samples as compared to Ar treated samples). The oxygen treatment also makes easier the charge transfer between Rh nanoparticles and carbon nanotubes upon gas adsorption. The method for treating and decorating multiwalled carbon nanotubes used here is simple, fast and scalable for producing gas sensitive nanohybrid materials with uniform and well-controlled properties

Improvements in the thermal conductivity and mechanical properties of phase‐change microcapsules with oxygen‐plasma‐modified multiwalled carbon nanotubes

“…A high thermal conductivity and particles with good mechanical properties, such as carbon, metals, or graphite, should added to microPCMs. Multiwalled carbon nanotubes (CNTs) have an excellent thermal conductivity and mechanical and electrical properties . Thus, CNTs are beneficial for enhancing the heat‐transfer and mechanical performance of microPCMs.…”

“…Multiwalled carbon nanotubes (CNTs) have an excellent thermal conductivity and mechanical and electrical properties. [20][21][22] Thus, CNTs are beneficial for enhancing the heat-transfer and mechanical performance of microPCMs. Li et al 23 found that the thermal conductivity of microPCMs/ CNTs grafted with stearyl alcohol with 4% CNTs increased by 79% compared with microPCMs.…”

Implicit solvent model for effective molecular dynamics simulations of systems composed of colloid nanoparticles and carbon nanotubes

“…These materials have recently been extensively studied due to their numerous applications in the fields of drug delivery [1][2][3][4][5], gas sensing and biosensing [6][7][8], magnetic force microscopy, data storage etc. [9][10][11][12][13][14].…”

The MWCNTs-Rh Nanocomposite Obtained By The New High-Temperature Method

“…A review of the literature points out that fabrication methods are known and described of a nanocomposite based on carbon nanotubes and rhodium nanoparticles using a plasma generator [14], chemical reduction using NaBH 4 of relevant compounds, mainly salt, being the precursors of selected metals [15], i.e. electrodesposition of metallic nanoparticles onto carbon nanotubes [16].…”