Table 2.

Roughness characteristics, atomic fraction and chemical states of elements present in the top surface layer of polymer coatings deposited on the surface of PET substrata at 15 W before and after 60 s of plasma treatment.

	Before		After
Surface roughness
	1 µm × 1 µm	10 µm × 10 µm	1 µm × 1 µm	10 µm × 10 µm
Rq, nm	5.98	5.19	7.33	5.45
Rmax, nm	27.12	54.84	29.76	34.29
Rmin, nm	−18.19	−20.28	−22.00	−18.71
ADv, nm	4.80	3.93	5.93	4.26
R sk	0.28	0.93	0.38	0.63
R ku	0.04	2.77	−0.09	0.91
Atomic fraction, %
O 1s (530 eV)	26.0		29.6
C 1s (285 eV)	74.0		70.4