Figure 2. Fabrication of graphene vessel.

(a) Schematic of ion mediated assembly (IMA) process for fabricating graphene vessel. Copper mesh container (vessel) and counter electrode are immersed in GO solution. When a dc voltage is applied between the electrodes, GO nanoplatelets are attracted to anode and an ion-mediated assembly takes place. (b–d) Scanning electron microscopy (SEM) images of rGO aerogel (foam): (b) Image of rGO foam at the edge of copper mesh. The foam formed uniformly on the mesh without macroscopic holes. Scale bar is 500 μm. (c) Magnified SEM image of the rectangular part in the image of (b). (d) Cross-sectional SEM image of the foam. The rGO nanoplatelets are interconnected to form a three-dimensional porous structure with pores in the range of several micrometers to tens of micrometers. Scale bars are 50 μm and 10 μm, respectively, in (c,d).