Study of the Sensing Mechanism Towards Carbon Monoxide of Platinum-Based Field Effect Sensors

Author

Becker, Elin ; Andersson, Mike ; Eriksson, Mats ; Spetz, Anita Lloyd ; Skoglundh, Magnus

Author_Institution

Dept. Chem. & Biol. Eng., Univ. of Technol., Goteborg, Sweden

Volume

11

Issue

7

fYear

2011

fDate

7/1/2011 12:00:00 AM

Firstpage

1527

Lastpage

1534

Abstract

We have investigated the temperature dependence and the effect of hydrogen on the CO response of MISiC field effect device sensors. The evolution of adsorbates on a model sensor was studied by in situ DRIFT spectroscopy and correlated to sensor response measurements at similar conditions. A strong correlation between the CO coverage of the sensor surface and the sensor response was found. The temperature dependence and hydrogen sensitivity are partly in agreement with these observations, however at low temperatures it is difficult to explain the observed increase in sensor response with increasing temperature. This may be explained by the reduction of a surface oxide or removal of oxygen from the Pt/SiO₂ interface at increasing temperatures. The sensing mechanism of MISiC field effect sensors is likely complex, involving several of the factors discussed in this paper.

Keywords

Fourier transform spectra; carbon compounds; field effect devices; gas sensors; hydrogen; infrared spectra; platinum; reduction (chemical); silicon compounds; CO; H₂; Pt-SiO₂; carbon monoxide; hydrogen sensitivity; in situ DRIFT spectroscopy; platinum-based field effect sensors; sensing mechanism; sensor response measurements; surface oxide reduction; Logic gates; Platinum; Spectroscopy; Temperature measurement; Temperature sensors; CO; MISiC; diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy; gas sensors; hydrogen; platinum; platinum oxide; sensing mechanism;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2010.2099652

Filename

5668492