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Self-propagating solar light reduction of graphite oxide in water

Todorova, N, Giannakopoulou, T, Boukos, N, Vermisoglou, E, Lekakou, Constantina and Trapalis, C (2016) Self-propagating solar light reduction of graphite oxide in water Applied Surface Science., 391 (Part B). pp. 601-608.

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Graphite Oxide (GtO) is commonly used as an intermediate material for preparation of graphene in the form of reduced graphene oxide (rGO). Being a semiconductor with tunable band gap rGO is often coupled with various photocatalysts to enhance their visible light activity. The behavior of such rGO-based composites could be affected after prolonged exposure to solar light. In the present work, the alteration of the GtO properties under solar light irradiation is investigated. Water dispersions of GtO manufactured by oxidation of natural graphite via Hummers method were irradiated into solar light simulator for different periods of time without addition of catalysts or reductive agent. The FT-IR analysis of the treated dispersions revealed gradual reduction of the GtO with the increase of the irradiation time. The XRD, FT-IR and XPS analyses of the obtained solid materials confirmed the transition of GtO to rGO under solar light irradiation. The reduction of the GtO was also manifested by the CV measurements that revealed stepwise increase of the specific capacitance connected with the restoration of the sp2 domains. Photothermal self-propagating reduction of graphene oxide in aqueous media under solar light irradiation is suggested as a possible mechanism. The self-photoreduction of GtO utilizing solar light provides a green, sustainable route towards preparation of reduced graphene oxide. However, the instability of the GtO and partially reduced GO under irradiation should be considered when choosing the field of its application.

Item Type: Article
Subjects : subj_Mechanical_Engineering
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Todorova, N
Giannakopoulou, T
Boukos, N
Vermisoglou, E
Trapalis, C
Date : 4 May 2016
Funders : FP7 Autosupercap, GSRT PhotoTiGRA and PolyGraph project
DOI : 10.1016/j.apsusc.2016.04.088
Copyright Disclaimer : © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Depositing User : Symplectic Elements
Date Deposited : 10 May 2016 14:26
Last Modified : 16 Jan 2019 17:03

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