Photoluminescence of a covalent assembled porphyrin-based monolayer: optical behavior in the presence of O2.
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).
Gulino
Antonino
A
Dipartimento di Scienze Chimiche, Università di Catania, and I.N.S.T.M. UdR of Catania, Viale Andrea Doria 6, 95125 Catania, Italy.
Giuffrida
Salvatore
S
Mineo
Placido
P
Purrazzo
Michele
M
Scamporrino
Emilio
E
Ventimiglia
Giorgio
G
van der Boom
Milko E
ME
Fragalà
Ignazio
I