Room temperature gas sensing properties of ultrathin carbon nanotubes by surfactant-free dip coating

Piloto, Carlo, Mirri, Francesca, Bengio, Elie Amram, Notarianni, Marco, Gupta, Bharati, Shafiei, Mahnaz, Pasquali, Matteo, & Motta, Nunzio (2016) Room temperature gas sensing properties of ultrathin carbon nanotubes by surfactant-free dip coating. Sensors and Actuators B : Chemical, 227, pp. 128-134.

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Abstract

Large-scale production of reliable carbon nanotubes (CNTs) based gas sensors involves the development of scalable and reliable processes for the fabrication of films with controlled morphology. Here, we report for the first time on highly scalable, ultrathin CNT films, to be employed as conductometric sensors for NO2 and NH3 detection at room temperature. The sensing films are produced by dip coating using dissolved CNTs in chlorosulfonic acid as a working solution. This surfactant-free approach does not require any post-treatment for the removal of dispersants or any CNTs functionalization, thus promising high quality CNTs for better sensitivity and low production costs. The effect of CNT film thickness and defect density on the gas sensing properties has been investigated. Detection limits of 1 ppm for NO2 and 7 ppm for NH3 have been achieved at room temperature. The experimental results reveal that defect density and film thickness can be controlled to optimize the sensing response. Gas desorption has been accelerated by continuous in-situ UV irradiation.

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ID Code: 91626
Item Type: Journal Article
Refereed: Yes
Keywords: Carbon nanotubes, Ultrathin films, Gas sensors, Surfactant-free dip coating, X-ray photoelectron microscopy, Transmission electron microscopy
DOI: 10.1016/j.snb.2015.12.051
ISSN: 0925-4005
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Copyright Owner: Copyright 2016 Elsevier
Deposited On: 05 Jan 2016 23:37
Last Modified: 29 Jan 2016 18:33

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