Facile reduction of graphene oxide suspensions and films using glass wafers

Abstract

This paper reports a facile and green method for conversion of graphene oxide (GO) into graphene by low-temperature heating (80 °C) in the presence of a glass wafer. Compared to conventional GO chemical reduction methods, the presented approach is easy-scalable, operationally simple, and based on the use of a non-toxic recyclable deoxygenation agent. The efficiency of the proposed method is further expanded by the fact that it can be applied for reducing both GO suspensions and large-scale thin films formed on various substrates prior to the reduction process. The quality of the obtained reduced graphene oxide (rGO) strongly depends on the type of the used glass wafer, and, particularly, magnesium silicate glass can provide rGO with the C/O ratio of 7.4 and conductivity of up to 33000 S*cm. Based on the data obtained, we have suggested a mechanism of the observed reduction process in terms of the hydrolysis of the glass wafer with subsequent interaction of the leached alkali and alkali earth cations and silicate anions with graphene oxide, resulting in elimination of the oxygen-containing groups from the latter one. The proposed approach can be efficiently used for low-cost bulk-quantity production of graphene and graphene-based materials for a wide field of applications.

From graphene oxide towards aminated graphene: facile synthesis, its structure and electronic properties

“…No nitrates were used to prevent nitrogen doping of graphene oxide during the synthesis. The rest of the GO preparation procedure is analogous to that described in our previous work 30 and its main steps are as follows. The resulting mixture was centrifuged at 3500 rpm for 1 hour, and the supernatant was decanted away.…”

“…techniques was exploited similarly to the used in the aforementioned work 30 with some extensions concerning the study of the aminated and brominated materials as follows. Measurements using X-ray photoelectron spectroscopy (XPS) were made using Thermo Fisher ESCALAB 250Xi XPS system equipped with an Al Kα X-ray source providing 1486.6 eV line.…”

“…Structural characterization was mainly performed analogously to that presented in our previous work 30 with some differences as can be seen in the following. X-ray diffraction (XRD) technique was implemented using Bruker Smart Apex Duo set-up equipped with a CuKα source and an Apex 2D detector.…”

Reduced graphene oxide-intercalated graphene oxide nano-hybrid for enhanced photoelectrochemical water reduction

“…3a shows peak of GO dispersion at 296 nm. This is due to the n-π* transfer of the C=O bond in carbonyl and carboxyl functional groups [44,45]. In addition, it also can arise from electronic transfer involving π and π* orbitals in the sp 2 clusters remained in the structure of GO after its oxidation [46].…”

Development of hydrophobic reduced graphene oxide as a new efficient approach for photochemotherapy

“…Interestingly, its NIR absorbance can be improved by up to six times compared to GO due to its highly intact aromatic structure. 28 Gonçalves and co-workers proved that an extremely small amount of nano-GO (i.e. 0.0005 mg mL À1 ) could transfer energy from particles to a specic solution via radiation (i.e.…”