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Gas Sensing with Iridium Oxide Nanoparticle Decorated Carbon Nanotubes

MINOS-EMaS, Universitat Rovira i Virgili, 43007 Tarragona, Spain
Materia Nova, 7000 Mons, Belgium
Jožef Stefan Institute, 10000 Ljubljana, Slovenia
ChIPS, University of Mons, 7000 Mons, Belgium
Author to whom correspondence should be addressed.
Sensors 2019, 19(1), 113;
Received: 21 November 2018 / Revised: 17 December 2018 / Accepted: 25 December 2018 / Published: 31 December 2018
(This article belongs to the Special Issue Semiconductor and CMOS-Based Sensors for Environmental Monitoring)
PDF [23817 KB, uploaded 31 December 2018]


The properties of multi-wall carbon nanotubes decorated with iridium oxide nanoparticles (IrOx-MWCNTs) are studied to detect harmful gases such as nitrogen dioxide and ammonia. IrOx nanoparticles were synthetized using a two-step method, based on a hydrolysis and acid condensation growth mechanism. The metal oxide nanoparticles obtained were employed for decorating the sidewalls of carbon nanotubes. Iridium-oxide nanoparticle decorated carbon nanotube material showed higher and more stable responses towards NH3 and NO2 than bare carbon nanotubes under different experimental conditions, establishing the optimal operating temperatures and estimating the limits of detection and quantification. Furthermore, the nanomaterials employed were studied using different morphological and compositional characterization techniques and a gas sensing mechanism is proposed. View Full-Text
Keywords: iridium oxide; carbon nanotubes; chemoresistive gas sensor; metal nanoparticles; relative humidity effect iridium oxide; carbon nanotubes; chemoresistive gas sensor; metal nanoparticles; relative humidity effect

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Casanova-Cháfer, J.; Navarrete, E.; Noirfalise, X.; Umek, P.; Bittencourt, C.; Llobet, E. Gas Sensing with Iridium Oxide Nanoparticle Decorated Carbon Nanotubes. Sensors 2019, 19, 113.

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