SELF-ASSEMBLED MONOLAYERS OF MERCAPTOPORPHYRINS AS SENSING MATERIAL FOR QUARTZ-CRYSTAL MICROBALANCE CHEMICAL SENSORS

Thiol-functionalized metalloporphyrin have been deposited as self-asse mbled monolayers onto the gold pad of quartz crystal microbalances (QM Bs). The sensitivities of the resulting sensors have been measured wit h respect to model volatile organic compounds (VOCs), interesting for future practical applications. The sensitivities of these functionaliz ed QMBs depend on the number of the sulfide groups present at the peri pheral positions of the porphyrins, but they are higher if compared wi th the corresponding casting coated sensors. (C) 1998 Elsevier Science S.A. All rights reserved.