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Quartz Microbalances (QMBs) are largely used in chemical sensor applications since their high mass sensitivity, good fabrication reproducibility and relative low cost. QMB sensitivity is generally calculated using the Sauerbrey equation. However experimental data can deviate from this model in case of uneven film profile, thick layers or elastic materials. In this work, the mass-frequency relationship has been measured in case of thick and porous layers of porphyrins. After porphyrin deposition, the layer is dissolved in a known THF volume and mass is estimated by UV-Vis spectra and Lambert-Beer law. Results show that the measured frequency-mass relationship has a good linear behavior in the typical application range and sensitivity is 1.25 times lower than the Sauerbrey equation prediction.

P2MM.2 - Direct Estimation of Quartz Microbalance Sensitivity by a Straight Optical Procedure