The surface morphologies of GO and rGO were observed
using an FEI Quanta 200F Environmental SEM at 5.0 kV with
10 mm working distance and a TM3030 tabletop SEM at 15.0 kV.The samples were prepared by adhering GO and rGO
powder onto carbon conductive tape.The morphologies of GO
and rGO were further confirmed using a JEM 2100-F high
resolution-transmission electron microscopy (HR-TEM) sys-
tem at 200 kV accelerating voltage.Approximately 0.01 g of
GO and rGO samples were dispersed in ethanol,and a droplet
of each sample was loaded on a copper grid.