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Kinectic phase transitions and chemical sensors with catalytic metal gates
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2817-3574
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
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1997 (English)In: Chemical & Biological Sensors & Analytical Electrochemical Methods, 1997, Electrochemical Society , 1997, Vol. 97, no 19, 1-15 p.Conference paper, Published paper (Other academic)
Abstract [en]

Rapid transitions in the response of platinum based chemical sensors occurring at given hydrogen-oxygen concentration ratios are explained by kinetic phase transitions or switching phenomena on the catalytic metal surface. Below the transition point the response of platinum-insulator silicon carbide devices is small and above the transition large and almost saturated. It is found that the critical ratio depends on the operation temperature and the properties of the device. Three different cases are identified, namely injection-, diffusion- and reaction rate determined transitions. At sufficiently large temperatures the transition is injection limited and occurs at the stoichiometric ratio of hydrogen and oxygen in the gas mixture. The implications of the experimental observations on the applications of chemical sensors with catalytic sensing layers are discussed.

Place, publisher, year, edition, pages
Electrochemical Society , 1997. Vol. 97, no 19, 1-15 p.
Series
Electrochemical Society Series
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-88141ISI: A1997BJ30V00001ISBN: 978-1-56677-147-4 (print)ISBN: 1-56677-147-1 (print)OAI: oai:DiVA.org:liu-88141DiVA: diva2:602850
Conference
Symposium on Chemical and Biological Sensors and Analytical Electrochemical Methods, 1997, Paris , France
Available from: 2013-02-04 Created: 2013-01-30 Last updated: 2014-01-09

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Baranzahi, AmirLloyd Spetz, AnitaEkedahl, Lars-GunnarLundström, Ingemar

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