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Sensors 2016, 16(5), 731; doi:10.3390/s16050731

Recognizing Physisorption and Chemisorption in Carbon Nanotubes Gas Sensors by Double Exponential Fitting of the Response

1
Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
2
Elettra-Sincrotrone Trieste, S.S. 14, km 163.5, 34149 Trieste, Italy
3
CNR-IOM TASC, S.S. 14, km 163.5, 34149 Trieste, Italy
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Gregory Schneider
Received: 2 March 2016 / Revised: 15 May 2016 / Accepted: 16 May 2016 / Published: 19 May 2016
(This article belongs to the Special Issue Graphene and 2D Material Bionanosensors: Chemistry Matters)
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Abstract

Multi-walled carbon nanotubes (CNTs) have been grown in situ on a SiO 2 substrate and used as gas sensors. For this purpose, the voltage response of the CNTs as a function of time has been used to detect H 2 and CO 2 at various concentrations by supplying a constant current to the system. The analysis of both adsorptions and desorptions curves has revealed two different exponential behaviours for each curve. The study of the characteristic times, obtained from the fitting of the data, has allowed us to identify separately chemisorption and physisorption processes on the CNTs. View Full-Text
Keywords: CNTs sensors; chemisorption; physisorption CNTs sensors; chemisorption; physisorption
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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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Calvi, A.; Ferrari, A.; Sbuelz, L.; Goldoni, A.; Modesti, S. Recognizing Physisorption and Chemisorption in Carbon Nanotubes Gas Sensors by Double Exponential Fitting of the Response. Sensors 2016, 16, 731.

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