Gas sensing properties of multiwall carbon nanotubes decorated with rhodium nanoparticles

SENSORS AND ACTUATORS B-CHEMICAL

卷:160

Article

Leghrib, R.¹  Dufour, T.²  Demoisson, F.^2,3  Claessens, N.²  Reniers, F.²  Llobet, E.¹ 

[1] Univ Rovira & Virgili, MINOS EMaS, Tarragona 43007, Spain

[2] Univ Libre Bruxelles, Fac Sci, Serv Chim Analyt & Chim Interfaces CHANI, B-1050 Brussels, Belgium

[3] Univ Bourgogne, Lab Interdisciplinaire Carnot Bourgogne ICB, Dept Nanosci, Equipe MaNaPI,CNRS,UMR 5209, F-21078 Dijon, France

关键词: Metal decorated carbon nanotubes;    Rhodium nanoparticles;    Colloidal solution;    Atmospheric plasma treatment;    Gas sensors;    Room temperature gas sensing;   

DOI  :  10.1016/j.snb.2011.09.014

来源: Elsevier

【 摘 要 】

In 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 NO2, C2H4, CO, C6H6 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:02 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. (C) 2011 Elsevier B.V. All rights reserved.

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