Are vacuum-filtrated reduced graphene oxide membranes symmetric?

Abstract

Asymmetry of the reduced graphene oxide (rGO) membranes prepared by the commonly used vacuum filtration process is disclosed. When the filter membrane surface pores have similar dimension to GO sheets, the entry of GO sheets into its surface pore space during vacuum filtration can take place, leading to the asymmetry of the rGO membrane.

Graphene-Based Materials as Strain Sensors in Glass Fiber/Epoxy Model Composites

“…The C 1s spectrum can be fitted into five components, located at 284.8, 286.4, 287.1, 288.2, and 290.2 eV, corresponding to C−C, C−O, CO, and O−CO groups and the π−π* shakeup satellite structure, respectively. 21 The deconvolution of the C 1s peak suggests that its atomic C/O ratio is around 13.8, which is similar to the oxygen content of the weakly oxidized graphene. 22 The morphology of Elicarb and EG graphene coated glass fiber was observed by SEM as shown in Figures 2b and 2c, respectively.…”

A facile nanocomposite strategy to fabricate a rGO–MWCNT photothermal layer for efficient water evaporation

“…[23][24][25] Graphene, a two-dimensional (2D) nanomaterial, can be easily processed into a membrane on porous substrates by vacuum ltration. 26,27 However, the as-prepared graphene membrane usually shows a smooth surface with weak light absorption because of its strong light reection. Besides that, the membrane is constructed by densely stacked graphene sheets, and it is difficult for water molecules to pass through them without an external driving force.…”

In-situ Deposition of Graphene Oxide Catalyst for Efficient Photoelectrochemical Hydrogen Evolution Reaction Using Atmospheric Plasma

“…The primary component is corresponding to C-OH bonding and C-O-C bonding at 532.8 eV and the secondary component represents a carbon double bond with oxygen, i.e., C=O at 531 eV. The atomic percentage ratio of C/O calculated from XPS survey spectra in Figure 2 is 6.57, which corresponds to rGO [25][26][27]. The hydrophobic rGO was treated with argon plasma for one minute after carbon deposition and resulted in the hydrophilic GO.…”

“…The proportion of oxygen in hydrophilic GO treated with argon plasma is increased from 13.21% (untreated) to 27.27% (treated) with the addition of N1s peak. The atomic percentage ratio of C/O calculated from XPS survey spectra inFigure 3is 2.63 corresponding to GO[25][26][27].…”

“…The proportion of oxygen in hydrophilic GO treated with argon plasma is increased from 13.21% (untreated) to 27.27% (treated) with the addition of N1s peak. The atomic percentage ratio of C/O calculated from XPS survey spectra inFigure 3is 2.63 corresponding to GO[25][26][27].Materials 2019, 12, x FOR PEER REVIEW 5 of The XPS spectra survey of the hydrophilic graphene oxide (GO). (a) XPS wide-scan spectrum, (b) XPS high-resolution spectrum registered for the energy range of C1s, (c) O1s, and (d) N1s spectra of GO.…”