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

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 analys...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2016-05, Vol.16 (5), p.731
Main Authors: Calvi, Andrea, Ferrari, Alberto, Sbuelz, Luca, Goldoni, Andrea, Modesti, Silvio
Format: Article
Language:English
Subjects:
chemisorption
CNTs sensors
physisorption
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s16050731