Self-assembled monolayers of mercaptoporphyrins as sensing material for quartz crystal microbalance chemical sensors

Thiol-functionalized metalloporphyrin have been deposited as self-assembled monolayers onto the gold pad of quartz crystal microbalances (QMBs). The sensitivities of the resulting sensors have been measured with respect to model volatile organic compounds (VOCs), interesting for future practical applications. The sensitivities of these functionalized QMBs depend on the number of the sulfide groups present at the peripheral positions of the porphyrins, but they are higher if compared with the corresponding casting coated sensors.