Porphycene Films Grown on Highly Oriented Pyrolytic Graphite: Unveiling Structure–Property Relationship through Combined Reflectance Anisotropy Spectroscopy and Atomic Force Microscopy Investigations

Thin organic films are widely used in sensors, solar cells, and optical devices due to their intense absorption the visible/near-infrared (IR) region. Shifting, quenching, or reshaping of some spectral features can be achieved by chemical functionalization molecules, whereas an anisotropic fingerprint preferential molecular alignment induced via a proper design and/or preparation substrate. Recently, we investigated response thin porphycene acidification. With respect well-known closely related tetraphenyl porphyrin, has clear advantage being optically active full visible range, this makes naked eye immediate change film from brilliant blue-turquoise green when exposed HCl vapors. In work, exploiting homemade reflectance anisotropy spectroscopy (RAS) apparatus, explore possible anisotropies range relate them morphology analyzed atomic force microscopy (AFM).