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Equivalent electric circuits for chemical sensors in the Langmuir regime
University of Roma Tor Vergata, Italy.
University of Roma Tor Vergata, Italy; IDASC CNR, Italy.
University of Roma Tor Vergata, Italy; IDASC CNR, Italy.
University of Campus Biomed Roma, Italy.
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2017 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 238, p. 214-220Article in journal (Refereed) Published
Abstract [en]

This paper presents an equivalent electric circuit model that describes adsorption-desorption processes occurring on bio and chemical sensor surfaces under the Langmuir hypothesis and considers the following practical case: the pressure or concentration of the particles in the test chamber is not perturbed by these processes and keeps its initial value, as in the cases of relatively high pressure or concentration values with zero molecular flow, or in the presence of a molecular flow at any pressure or concentration value. It is also pointed out that the equivalent circuit for Langmuir adsorption is similar to the circuit proposed for enzymatic reactions. Even if this work essentially covers theoretic aspects, a way is suggested for the possible experimental determination of both adsorption-desorption parameters and adsorption-desorption site density. (C) 2016 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2017. Vol. 238, p. 214-220
Keywords [en]
Chemical sensors; Adsorption processes; Desorption processes; Equivalent electric circuit; Adsorption site density
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-133722DOI: 10.1016/j.snb.2016.07.011ISI: 000388948600028OAI: oai:DiVA.org:liu-133722DiVA, id: diva2:1063925
Available from: 2017-01-11 Created: 2017-01-09 Last updated: 2017-11-29

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