The influence of temperature on the sensitivity of a SAW gas sensor with a thin layer of lead phthalocyanine

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Authors

  • M. URBAŃCZYK Institute of Physics, Silesian Technical University, Poland

Abstract

The paper deals with experimental investigations concerning the influence of temperature on the sensitivity of a SAW sensor with a thin layer of lead phthalocyanine (PbPc) to NO2 molecules in the air. Measurements have been carried out with a dual delay line system providing simultaneously a survey of the differential frequency, Δf, and the measuring frequency, f. In all cases the measured frequency, f, was increased, whereas the changes in the difference of frequency, Δf, were negative as a result of the interaction with NO2 molecules. All the experiments have been made at the same conditions, i.e., with the same PbPc layer of a 310 nm thickness, at 40ppm NO2 in air and at a constant gas flow rate of 100 ml/min. In the range 30-60oC, the sensitivity increased almost linearly with temperature a constant rate of 0.13-0.15 kHz/oC.

References

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