Kinectic phase transitions and chemical sensors with catalytic metal gates
1997 (English)In: Chemical & Biological Sensors & Analytical Electrochemical Methods, 1997, Electrochemical Society , 1997, Vol. 97, no 19, 1-15 p.Conference paper (Other academic)
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.
, Electrochemical Society Series
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-88141ISI: A1997BJ30V00001ISBN: 978-1-56677-147-4ISBN: 1-56677-147-1OAI: oai:DiVA.org:liu-88141DiVA: diva2:602850
Symposium on Chemical and Biological Sensors and Analytical Electrochemical Methods, 1997, Paris , France