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Langmuir-Schaefer (LS) films of a free base porphyrin 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy) phenyl]-21H,23H-porphine (EHO) are used in conjunction with a poly(methyl methacrylate) PMMA molecule deposited as a various layer configuration thin films. EHO is the active sensing layer and PMMA is a barrier layer for gas molecules. PMMA molecules stick each other when they transferred on a solid substrate so they can stop vapor molecules before they reach to EHO layers. In order to investigate the gas sensing behaviors acetic acid was chosen for analyte vapor and UV-visible spectrometer was used for sensing system. The layer order of multilayered LS films was varied in order to investigate the sensing characteristics and vapor dynamics. It was observed that the place of PMMA layer effects the response time, speed and intensity. As it is expected from the theoretical studies, the interaction between thin film and vapor molecules starts from the surface of thin film and then vapor molecules starts to penetrate into film structure. The experimental results obtained from this study prove this dynamic diffusion effect between thin film and vapor molecules. Thus the interaction kinetics between thin film molecules and vapor molecules were demonstrated using the barrier layer affect.

Determination of Interaction Mechanism between Porphyrin Thin Film and Organic Vapor