Optical and morphological characterization of bispyrazole thin films for gas sensing applications

Abstract The optical gas recognition capabilities of thin film layer of 4-[bis[(3,5-dimethyl-1H-pyrazol-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 (SO 2 , NO 2 , CO, CH 4 and NH 3 ). The spin-coated bispyrazole layer appears to have reversible response towards SO 2 and a very low and irreversible response to NO 2 . The selectivity of the thin film based on bispyrazole layer with respect to other analytes was also examined and the present data show that the thin sensing layer in the presence of CO, CH 4 and NH 3 in low concentration does not influence its optical properties.