Title :
In situ DRIFT study of hydrogen and CO adsorption on Pt/SiO2 model sensors
Author :
Becker, Elin ; Skoglundh, Magnus ; Andersson, Mike ; Spetz, Anita Lloyd
Author_Institution :
Chalmers Univ. of Technol., Goteborg
Abstract :
The sensing mechanism towards carbon monoxide of metal insulator silicon carbide (MISiC) field effect devices used as sensors, has been studied by in situ FTIR spectroscopy in diffuse reflectance mode (DRIFT). The infrared studies were performed using a model sensor, where adsorption of CO in presence of oxygen and hydrogen has been studied. The results show that the CO adsorption on Pt varies with varying oxygen concentration, CO concentration, hydrogen exposure and temperature. When correlating the DRIFT spectroscopy with sensor signal measurements, the CO response of MISiC field effect devices appears to be connected to the CO coverage of the sensor surface.
Keywords :
field effect devices; gas sensors; infrared spectroscopy; DRIFT spectroscopy; FTIR spectroscopy; diffuse reflectance mode; hydrogen adsorption; metal insulator silicon carbide field effect devices; model sensor; sensor signal measurements; Biological system modeling; Chemical and biological sensors; Gas detectors; Hydrogen; Metal-insulator structures; Sensor phenomena and characterization; Silicon carbide; Silicon compounds; Spectroscopy; Temperature sensors;
Conference_Titel :
Sensors, 2007 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1261-7
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2007.4388580
