Table 1.

Roughness characteristics, atomic fraction and chemical states of elements present in top surface layer of polymer coatings deposited on the surface of PET substrata.

	PET	10 W	15 W	20 W	25 W	30 W
1 µm × 1 µm
Rq, nm	1.07	3.19	5.98	2.20	1.73	8.97
Rmax, nm	4.31	22.49	27.12	10.87	7.64	33.75
Rmin, nm	−3.14	−7.49	−18.19	−6.90	−6.96	−28.25
ADv, nm	0.83	2.37	4.80	1.76	1.36	7.20
R sk	0.39	1.38	0.28	0.39	0.26	0.06
R ku	0.47	3.33	0.04	0.13	0.32	-0.15
10 µm × 10 µm
Rq, nm	2.08	4.72	5.19	4.07	3.21	9.18
Rmax, nm	39.73	56.82	54.84	38.02	36.58	107.03
Rmin, nm	−6.41	−14.28	−20.28	−11.85	−10.58	−31.72
ADv, nm	1.54	3.29	3.93	2.94	2.35	6.78
R sk	1.80	2.12	0.93	1.57	1.34	1.29
R ku	14.20	10.10	2.77	5.73	5.14	7.12
Atomic fraction, %
O 1s (530 eV)		25.1	26.0	22.9	14.0	21.4
C 1s (285 eV)		73.0	74.0	77.1	86.1	78.7
N 1s (397 eV)		1.9
O/C ratio		0.34	0.35	0.30	0.16	0.27
Water contact angle, °		62.1 ± 2.1	66.6 ± 1.9	70.3 ± 1.5	74.2 ± 1.8	77.1 ± 0.8