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Robust high temperature composite and CO sensor made from such composite

United States Patent

April 13, 2010
View the Complete Patent at the US Patent & Trademark Office
Described herein is a composite exhibiting a change in electrical resistance proportional to the concentration of a reducing gas present in a gas mixture, detector and sensor devices comprising the composite, a method for making the composite and for making devices comprising the composite, and a process for detecting and measuring a reducing gas in an atmosphere. In particular, the reducing gas may be carbon monoxide and the composite may comprise rutile-phase TiO.sub.2 particles and platinum nanoclusters. The composite, upon exposure to a gas mixture containing CO in concentrations of up to 10,000 ppm, exhibits an electrical resistance proportional to the concentration of the CO present. The composite is useful for making sensitive, low drift, fast recovering detectors and sensors, and for measuring CO concentrations in a gas mixture present at levels from sub-ppm up to 10,000 ppm. The composites, and devices made from the composites, are stable and operable in a temperature range of from about C. to about C., such as may be found in a combustion chamber.
Dutta; Prabir K. (Worthington, OH), Ramasamy; Ramamoorthy (Strongsville, OH), Li; Xiaogan (Columbus, OH), Akbar; Sheikh A. (Hilliard, OH)
The Ohio State University Research Foundation (Columbus, OH)
12/ 040,597
February 29, 2008
STATEMENT ON FEDERALLY FUNDED RESEARCH This invention was funded at least in part by The Department of Energy grant number DE-PS26-02NT41422. The government may have certain rights in this invention.