Table 3.

Atomic percentages (at.%) of XPS-identified chemical species at the C 1s and Si 2p peaks of untreated and plasma-coated leather samples.

Element	Species	Binding Energy (eV)	CC-0	CC-3	CC-6	CC-12
C 1s	C-H/C-C	284.6	55.17	44.44	71.05	67.79
	C-N/C-O/C-Si	286.0	11.23	11.66	0.66	1.48
	C=O	286.9	4.26	11.68	1.59	1.03
	O=C-O	288.7	4.86	10.07	0.65	-
	COOH/COOR	291.5	-	6.24	-	0.14
Si 2p	SiOx	101.3	-	6.98	12.57	15.92
	SiOx	102.2	0.95	-	-	-
	SiO2/SiO2(CH3)3	103.2	-	-	-	-