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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Published inSensors (Basel, Switzerland) Vol. 16; no. 5; p. 731
Main Authors Calvi, Andrea, Ferrari, Alberto, Sbuelz, Luca, Goldoni, Andrea, Modesti, Silvio
Format Journal Article
LanguageEnglish
Published Switzerland MDPI 19.05.2016
MDPI AG
Subjects
chemisorption
CNTs sensors
physisorption
CNTs sensors
physisorption
chemisorption
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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.
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These authors contributed equally to this work.
ISSN:1424-8220
1424-8220
DOI:10.3390/s16050731