Reduction of graphene oxide (GO) is a key process toward simple and massively scalable production of graphene. Analytic techniques such as X-Ray diffraction, X-Ray photoemission spectroscopy and Raman spectroscopy are excellent for ex-situ post-process assessment of the state of reduction of GO, but are unsuited for a real-time analysis during the process itself. In this work, we show that photoluminescence (PL) spectroscopy can be effectively used to this aim, allowing tracing the time dynamics of photoreduction processes. A proof-of-concept is shown, using a low-cost setup, by considering the case of pristine GO samples and of GO/titanium dioxide (TiO2) composites. We show that the PL analysis allows evidencing in real time the TiO2-induced photocatalytic contribution to GO photoreduction and the changes in photoreduction rates caused by the presence of oxygen and water molecules adsorbed on GO surfaces.
Photoluminescence-based real-time monitoring of graphene oxide photoreduction: Demonstrations and application to graphene oxide/titanium dioxide composites / Pallotti, DEBORAH KATIA; Gesuele, Felice; Palomba, M.; Longo, A.; Carotenuto, G.; Maddalena, Pasqualino; Lettieri, Stefano. - In: JOURNAL OF LUMINESCENCE. - ISSN 0022-2313. - 188:(2017), pp. 129-134. [10.1016/j.jlumin.2017.04.011]
Photoluminescence-based real-time monitoring of graphene oxide photoreduction: Demonstrations and application to graphene oxide/titanium dioxide composites
PALLOTTI, DEBORAH KATIA;GESUELE, FELICE;MADDALENA, PASQUALINO;LETTIERI, STEFANO
2017
Abstract
Reduction of graphene oxide (GO) is a key process toward simple and massively scalable production of graphene. Analytic techniques such as X-Ray diffraction, X-Ray photoemission spectroscopy and Raman spectroscopy are excellent for ex-situ post-process assessment of the state of reduction of GO, but are unsuited for a real-time analysis during the process itself. In this work, we show that photoluminescence (PL) spectroscopy can be effectively used to this aim, allowing tracing the time dynamics of photoreduction processes. A proof-of-concept is shown, using a low-cost setup, by considering the case of pristine GO samples and of GO/titanium dioxide (TiO2) composites. We show that the PL analysis allows evidencing in real time the TiO2-induced photocatalytic contribution to GO photoreduction and the changes in photoreduction rates caused by the presence of oxygen and water molecules adsorbed on GO surfaces.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.