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• W3192662373 endingPage "150883" @default.
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• W3192662373 abstract "• GO samples were successfully prepared via two new modified Hummers’ approaches. • The pre-oxidation of graphite was performed using H 3 BO 3 /H 2 SO 4 and H 3 BO 3 /H 2 SO 4 /CrO 3. • The obtained GO samples differed in the content and nature of oxygen functional groups. • GO obtained using H 2 SO 4 /H 3 BO 3 /CrO 3 mixture has a higher oxidation degree C/O = 1.03. • rGO derived from new synthesized GO were tested as label-free sensors for H 2 O 2. This research presents two new modified Hummers' methods which include the pre-oxidation of graphite powder by mixtures of H 3 BO 3 /H 2 SO 4 and H 3 BO 3 /H 2 SO 4 /CrO 3 . Compared to the traditional Hummers’ method, these significant improvements substantially enhanced the number of oxygen functionalities onto graphene oxide (GO) layers. The GO samples were characterized by X-ray photoelectron spectroscopy (XPS), Boehm titration, Raman spectroscopy, X-ray diffraction (XRD), dynamic light scattering (DLS), and zeta potential analysis. Boehm titration results showed that GO layers contain oxygen functionalities such as phenolic, ketone, lactone, carboxyl, and epoxy. Quantitative XPS analysis reveals that GO obtained using a pre-oxidation step with H 2 SO 4 /H 3 BO 3 /CrO 3 mixture has a higher oxidation degree (C/O = 1.03). Moreover, this sample possessed a greater number of electronegative functional groups, resulting in the decrease of the zeta potential (-43.3 mV). Raman analysis revealed a slightly higher structural disorder in GO layers during the increase in oxidation levels. Further, reduced GO (rGO) obtained from new synthesized GO were tested as label-free H 2 O 2 sensors electrodes. The electrochemical investigations showed that the samples were prospective on H 2 O 2 sensing. Our results suggest that the properties of rGO can be tuned by varying the oxidation degree of GO, which may stimulate new developments in rGO-based sensors." @default.
• W3192662373 created "2021-08-16" @default.
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• W3192662373 date "2021-11-01" @default.
• W3192662373 modified "2023-09-25" @default.
• W3192662373 title "A novel approach to prepare highly oxidized graphene oxide: structural and electrochemical investigations" @default.
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• W3192662373 doi "https://doi.org/10.1016/j.apsusc.2021.150883" @default.
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