Figure 1
From: 3D Oxidized Graphene Frameworks for Efficient Nano Sieving
Micro structural analysis of porous membranes fabricated from 3D oxidized graphene framework (a) Cross-sectional SEM micrograph of graphene based filter showing micro-pores. Bottom-left inset shows micrograph of large chunk while the bottom-right inset shows a zoomed in image of a part of the same (b) SEM micrograph shows 3D view of a lower dimensional microhole array inside larger microhole structure. Inset on the left shows the front surface of similar such structure while the inset on the right shows the Raman spectrum (top-right), UV-Vis absorption spectrum (middle-right), zoomed in image of nanohole within microhole (bottom-right) and the FFT image of sheet (top-left). (c) Shows large (~10 μm) NaCl crystallites sticking on the membrane after filtration. The inset at the bottom-left shows smaller (<200 nm) NaCl crystals on the surface of membrane. (d) TEM micrograph of clusters of NaCl nano crystals on membrane. The EDX confirms the presence of Na and Cl elements.
