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In the present work, multiwalled carbon nanotubes were decorated with rhodiumnanoparticles using a colloidal solution in the post-discharge of an RFatmospheric plasma of argon (Ar) or argon/oxygen (Ar:O$_2$). The properties ofthese 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 viewof compositional and morphological studies. It was found that the presence ofoxygen in the plasma treatment is essential to significantly enhance the gasresponse of Rh-decorated multiwalled carbon nanotubes and to avoid responsesaturation even at low gas/vapor concentrations. These desirable effects areattributed to the presence of oxygen during the CNT plasma treatment sinceoxygenated vacancies act both as active adsorption sites for gases and asanchoring sites for Rh nanoparticles (the presence of Rh nanoclusters is nearlydoubled in Ar-O$_2$ treated samples as compared to Ar treated samples). Theoxygen treatment also makes easier the charge transfer between Rh nanoparticlesand carbon nanotubes upon gas adsorption. The method for treating anddecorating multiwalled carbon nanotubes used here is simple, fast and scalablefor producing gas sensitive nanohybrid materials with uniform andwell-controlled properties.

Gas sensing properties of multiwall carbon nanotubes decorated with Rh nanoparticles