The optical gas recognition capabilities of thin ﬁlm layer of 4-[bis[(3,5-dimethyl-1H-pyr- azol-1-yl)methyl]-amino]phenol deposed on quartz substrates were studied. The dynamic gas responses to the following analytes have been investigated as air pollutants (SO2,NO2, CO, CH4 and NH3). The spin-coated bispyrazole layer appears to have reversible response towards SO2 and a very low and irreversible response to NO2. The selectivity of the thin ﬁlm based on bispyraz- ole layer with respect to other analytes was also examined and the present data show that the thin sensing layer in the presence of CO, CH4 and NH3 in low concentration does not inﬂuence its opti- cal properties.
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