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

Elin Becker (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; M. Andersson ; M. Eriksson ; A. L. Spetz ; Magnus Skoglundh (Kompetenscentrum katalys (KCK) ; Institutionen för kemi- och bioteknik, Teknisk ytkemi)
IEEE Sensors Journal (1530-437X). Vol. 11 (2011), 7, p. 1527-1534.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: CO, diffuse reflectance infrared Fourier transform (DRIFT), spectroscopy, gas sensors, hydrogen, MISiC, platinum, platinum oxide, sensing mechanism, co oxidation, infrared-spectroscopy, ftir spectroscopy, adsorption, temperature, hydrogen, pt(111), oxygen, palladium, pt-al2o3



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Denna post skapades 2011-06-10. Senast ändrad 2012-02-14.
CPL Pubid: 141502

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
Kompetenscentrum katalys (KCK)

Ämnesområden

Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Transport
Hållbar utveckling
Kemi

Chalmers infrastruktur