Photoluminescence of a covalent assembled porphyrin-based monolayer: optical behavior in the presence of O2 |
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Authors: | Gulino Antonino Giuffrida Salvatore Mineo Placido Purrazzo Michele Scamporrino Emilio Ventimiglia Giorgio van der Boom Milko E Fragalà Ignazio |
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Institution: | Dipartimento di Scienze Chimiche, Università di Catania, and I.N.S.T.M. UdR of Catania, Viale Andrea Doria 6, 95125 Catania, Italy. |
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Abstract: | The optical O(2) recognition capability of a covalently assembled monolayer (CAM) of 5,10,15-tri-{p-dodecanoxyphenyl}-20-(p-hydroxyphenyl) porphyrin on silica-based substrates was studied at room temperature by both UV-vis and photoluminescence (PL) measurements. The optical properties of this robust monolayer setup appear to be highly sensitive to the O(2) concentration in N(2). Both UV-vis and PL measurements were used to study the porphyrin-oxygen interactions. The monolayer-based sensor exhibits a short response time and can be restored within seconds. The oxygen-induced luminescence quenching of the monolayer involves both ground and excited states. The proposed mechanism responsible for the luminescence quenching involves different kinds of interactions between the monolayer and O(2). |
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