Field Emission Properties of the Graphene Double-Walled Carbon Nanotube Hybrid Films Prepared by Vacuum Filtration and Screen Printing

Figure 8

FESEM images of (a) SPGC-0, (b) VFGC-0, (c) VFGC-20, (d) VFGC-60, and (e) VFGC-100.

(a)

(b)

(c)

(d)

(e)