DETECTION OF VOLATILE ORGANIC COMPOUNDS USING TITANIUM DIOXIDE COATED WITH DYE-PORPHYRINS THIN FILMS IN BULK ACOUSTIC SYSTEM

Abstract

Thin films of titanium dioxide (TiO₂) coated with dye porphyrins were prepared on Quartz Crystal Microbalance (QCM) using sol-gel dip coating method. Two porphyrin dyes, 5,10,15,20-tetraphenyl-21H,23H-porphine manganese (III) chloride and 5,10,15,20-tetraphenyl-21H,23H-porphine iron (III) chloride, were used as sensing materials. Bulk acoustic system has been designed and used to detect some volatile organic compounds (VOCs). The sensing sensitivity of the QCM coated with thin films has been measured with respect to acetone and 2-propanol vapors. It was found that all thin films were sensitive and had selectivity properties towards both vapors.