Aug 1, 2019 · High quality graphene oxide (GO) and reduced graphene oxide (rGO) have been synthesized by chemical oxidation of graphite flakes via three modified Hummers methods using a mixture of sulfuric acid (H 2 SO 4), phosphoric acid (H 3 PO 4) and nitric acid (HNO 3) as intercalating agents and potassium permanganate (KMnO 4) and hydrogen peroxide (H 2 ...

Reduced graphene oxide (RGO)/Ni composites with high-performance microwave absorption were successfully synthesized through the electroless plating. The structures and morphologies of the...

Aug 1, 2014 · The survey XPS spectra recorded from the commercial samples FL-GOc and FL-RGOc show at the surface carbon, oxygen and traces of calcium, whereas the prepared graphene oxide and reduced graphene oxide show carbon, oxygen and sulphur contamination resulting from traces of sulphuric acid.

The XPS spectrum of Fe-2p of composite LMFO/rGO is shown in Fig. 8b, revealing the shifting of the position of Fe 2p 3/2, satellite peaks, and Fe 2p 1/2 towards higher binding energy compared...

Jul 12, 2017 · Used as glucose sensing material, the 3D NiO hollow sphere/rGO composite modified electrode exhibits high sensitivity of ~2.04 mA mM −1 cm −2, quick response time of less than 5 s, good...

The GO and rGO have been thoroughly characterized by FTIR, XPS, and XRD. The results showed the presence of different oxygen functional groups in the GO structure (e.g., carbonyl, epoxy, hydroxyl groups) confirming the successful oxidation of GO.

Jun 25, 2023 · XPS spectra of GO and rGO show unique patterns that reveal their chemical composition (Fig. 10) [80]. C(1 s) and (O1s) peaks are visible in the XPS full scan spectra of GO and rGO, positioned at around 285 and 532 eV, respectively [81] , [73] .

C1s XPS spectra of graphene oxide samples: (a) GO, (b) bwGO, (c) rGO and rbwGO. The results from O1s spectra of GO samples confirm the C1s results according to which the graphite structure is strongly oxidized and contains different oxygen functionalities.

Mar 27, 2017 · Two different reduced graphene oxide (rGO) derivatives, terminated by hydroxyl and epoxy-hydroxyl groups, were prepared and blended with two different molecular weights of polyethylene glycol...

... appearance of pseudocapacitance can be explained based on structural analysis of RGO. Fig. 4 shows the C1s XPS spectra of both GO and RGO. The C1s spectrum of RGO shows a major peak at...