Table 1.

PP samples treated by RF plasma slit jet used in the gas feed comparison: $Q_{\mathrm{Ar}}$ denotes Ar flow rate, $Q_{\mathrm{x}}$ is the flow rate of the additive gas (oxygen, nitrogen), P is the RF power, v is the treatment speed, and d is the distance between the slit exit and the sample surface. The letters f or s in the sample name denote a faster or slower treatment speed, respectively, and $fo$ is used for the optimized conditions at the faster treatment speed. Samples were treated two or ten times (passes).

Sample	Gas Feed	${\mathit{Q}}_{\mathbf{Ar}}/{\mathit{Q}}_{\mathbf{x}}$ (slm)	P (W)	v (mm/s)	Passes	d (mm)
Ar-f	Ar	67	500	100	2	10
ArO-f	Ar/O${}_2$	67/1.0	500	100	2	10
ArN-f	Ar/N${}_2$	67/1.5	500	100	2	10
ArN-$fo$	Ar/N${}_2$	100/3.5	600	100	2	10
Ar-s	Ar	67	500	22	10	5
ArO-s	Ar/O${}_2$	67/1.0	500	22	10	5
ArN-s	Ar/N${}_2$	67/1.2	400	22	10	5