Influence of subphase parameters on the nanostructures of 5,10,15,20-tetraphenyl-21H,23H-porphine films at air-water interface.
In this work, we have evaluated the influence of concentration of 5,10,15,20-tetraphenyl-21H,23H-porphine solutions on pi-A isotherms, varying the pH of subphase. The obtained pi-A isotherms indicated the existence of different aggregation states and the dependence of area/molecule with the pH was established. There is an increase in the area/molecule for both pH = 5 and pH = 8 in low concentrations with a marked increase for the acid pH. Such trend has given such clearly evidence that proton (H+) effect in the chromophore macrocycle is potentially indicated for the pH-sensitive gas sensors.
Department of Metallurgical and Materials Engineering of Federal University of Minas Gerais, Rua Espírito Santo, 35/316-Gentro. Belo Horizonte/MG, 30.160-030, Brazil.
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Mansur