Journal
INTERNATIONAL JOURNAL OF NANOTECHNOLOGY
Volume 12, Issue 8-9, Pages 562-571Publisher
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJNT.2015.068878
Keywords
vapour sensors; rhodium; multiwall carbon nanotubes; impedance spectroscopy; organic vapours
Funding
- NATO under the Science for Peace and Security Programme [SFP 984511]
- ICREA Academia Award
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In this paper, we describe a new approach for the development of a vapour sensor based on carbon nanotubes decorated with rhodium nanoparticles for detecting organic compounds. The morphology of treated multiwall carbon nanotubes was studied by means of high-resolution transmission electron microscopy (TEM) and the composition by X-ray photoelectron spectroscopy (XPS). Various aromatic and non-aromatic vapours were tested. For non-aromatic vapours, the response kinetics shows that these species are chemisorbed at the surface of carbon nanotubes. On the other hand, with aromatic vapours, the kinetics shows a physisorption behaviour. Also, the developed sensor shows lower sensitivity for non-aromatic than for aromatic vapours. The drift in sensor response remained below 10% after two months of sensor operation, which shows the high stability of the rhodium-carbon nanotubes film.
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