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;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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/674722
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