Table 2. BE position and atomic concentration of C, N and O in FPCN and CPS.

Formulation	Name	BE (ev) Position	Atomic concentration (%)
FPCHN-30	C	284.9	78.5
	N	399.7	9.5
	O	532.1	12.0
PCN	C	285.2	79.5
	N	-	-
	O	533.0	20.5