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    MagnetoPlasmonic Waves/HOMO-LUMO Free pi-Electron Transitions Coupling in Organic Macrocycles and Their Effect in Sensing Applications

    Year: 2021

    Journal: Chemosensors, Volume 9, OCT

    Authors: Manera, Maria Grazia; Giancane, Gabriele; Bettini, Simona; Valli, Ludovico; Borovkov, Victor; Colombelli, Adriano; Lospinoso, Daniela; Rella, Roberto

    Organizations: European Union [828779]

    Keywords: magneto-plasmonic; cobalt bisporphyrins; terbium bisphthalocyanine; Langmuir-Schafer technique; chemical sensing

    Optical and magneto-optical surface plasmon resonance (MOSPR) characterization and preliminary sensing test onto single- and multi-layers of two organic macrocycles have been performed; TbPc2(OC11H21)(8) phthalocyanine and CoCoPo2 porphyrin were deposited by the Langmuir-Schafer (LS) technique onto proper Au/Co/Au magneto-optical transducers. Investigations of the MOSPR properties in Kretschmann configuration by angular modulation, gives us an indication about the potential discrimination of two organic macrocycles with absorption electronic transition in and out of the propagating plasmon energy spectral range. An improved molecular vapors sensitivity increase by the MOSPR sensing probe can be demonstrated depending on the overlap between the plasmonic probe energy and the absorption electronic transitions of the macrocycles under investigation. If the interaction between the plasmon energy and molecular HOMO-LUMO transition is preserved, a variation in the complex refractive index takes place. Under this condition, the magneto-plasmonic effect reported as 1/|MOSPR| signal allows us to increase the detection of molecules deposited onto the plasmonic transducer and their gas sensing capacity. The detection mechanism appears strongly enhanced if the Plasmon Wave/HOMO-LUMO transitions energy are in resonance. Under coupling conditions, a different volatile organic compounds (VOC) sensing capability has been demonstrated using n-butylamine as the trial molecule.
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