Table 1.

Work function of carbon-based materials.

Sl. no.	Material	Work function (eV)	Ref.
1	graphene oxide	3.7–5.1	[118]
2	reduced graphene oxide	4.5	[119]
3	graphene	4.8–5.1	[120]
4	graphitic carbon nitride	4.4–4.7	[121]
5	carbon nanotubes	4.7–4.9	[122]