Obtained data from XPS analysis of C 1s in bulk and nano forms of PFPS.

Bond type	Bulk				Nano
	Peak energy bond, eV	Height ratio	Area ratio	FWHM, eV	Peak energy bond, eV	Height ratio	Area ratio	FWHM, eV
C C, C–C	284.64	1	1	1.32	284.55	1	1	1.38
C–O	286.07	0.83	0.89	1.41	285.93	0.19	0.2	1.45
C=O	287.51	0.18	0.13	1.01	287.72	0.14	0.15	1.47
O–C O	288.71	0.23	0.23	1.32	—	—	—	—