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Archives of Acoustics,
22, 2, pp. 187-196, 1997
The influence of temperature on the sensitivity of a SAW gas sensor with a thin layer of lead phthalocyanine
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.
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.
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