Data for: Effects of Air Nonequilibrium Atmospheric-Pressure Plasma Jet Treatment on Characteristics of Polypropylene Film Surfaces

Fig. 3. (a) Waveform of the voltage applied to the twisted wires and (b)−(e) waveforms of discharge currents following into the cylinder electrode and the sample stage, IC and IS, for 3 and 10 l/min air plasma jets at a nozzle-to-sample distance of 1 mm. Fig. 4. RMS discharge currents flowing into the cylinder electrode and the sample stage, IC and IS, for air and Ar plasma jets generated at various nozzle-to-sample distances, as a function of gas flow rate. Fig. 5. Comparison between the spectra of light emitted from (a) air and (b) Ar plasma jets. The inset shows the Ar plasma spectrum magnified at the UV range of 280−400 nm in wavelength. Fig. 6. Contact angles of PP film surfaces treated with air and Ar plasma jets, as a function of treatment time. In each figure, the contact angle at zero treatment time corresponds to that of untreated PP film surface. Fig. 7. XPS spectra of C 1s regions of (a) untreated PP film surface, (b) 3 l/min air plasma-treated surface, (c) 10 l/min air plasma-treated surface, and (d) 3 l/min Ar plasma-treated surface, at a treatment time of 1 min and a nozzle-to-sample distance of 1 mm. (e) Comparison between chemical compositions of the plasma-treated surfaces. Fig. 8. XPS spectra of O 1s regions of (a) 3 l/min air plasma-treated surface, (b) 10 l/min air plasma-treated surface, and (c) 3 l/min Ar plasma-treated surface, at a nozzle-to-sample distance of 1 mm. (d) Comparison between the ratios of O=C to O−C of the plasma-treated surfaces. Fig. 9. SEM images of PP film surfaces treated with 3 and 10 l/min air plasma jets and with 3 l/min Ar plasma jet at a nozzle-to-sample distance of 1 mm. Fig. 10. Temperatures of PP film surfaces treated with air and Ar plasma jets, as a function of treatment time.

图3. (a) 施加于绞合导线的电压波形；(b)−(e) 分别为气流速率3 l/min和10 l/min的空气等离子体射流在喷嘴与样品间距为1 mm时，流入圆柱电极与样品台的放电电流波形（记为IC和IS）。
图4. 不同喷嘴-样品间距下产生的空气与氩（Ar）等离子体射流的流入圆柱电极和样品台的均方根（Root Mean Square, RMS）放电电流随气体流速的变化关系。
图5. (a) 空气等离子体射流与(b) 氩等离子体射流的发射光谱对比。插图为波长280−400 nm紫外区间的放大氩等离子体光谱。
图6. 经空气与氩等离子体射流处理的聚丙烯（Polypropylene, PP）薄膜表面接触角随处理时长的变化关系。其中，处理时长为0时的接触角对应未处理PP薄膜表面的接触角。
图7. 在处理时长1 min、喷嘴-样品间距1 mm的条件下，(a) 未处理PP薄膜表面、(b) 3 l/min空气等离子体处理表面、(c) 10 l/min空气等离子体处理表面以及(d) 3 l/min氩等离子体处理表面的C 1s区X射线光电子能谱（X-ray Photoelectron Spectroscopy, XPS）。(e) 不同等离子体处理表面的化学成分对比。
图8. 在喷嘴-样品间距1 mm的条件下，(a) 3 l/min空气等离子体处理表面、(b) 10 l/min空气等离子体处理表面以及(c) 3 l/min氩等离子体处理表面的O 1s区XPS光谱。(d) 不同等离子体处理表面的O=C与O−C键占比对比。
图9. 喷嘴-样品间距为1 mm时，经3 l/min、10 l/min空气等离子体射流以及3 l/min氩等离子体射流处理的PP薄膜表面扫描电子显微镜（Scanning Electron Microscope, SEM）图像。
图10. 经空气与氩等离子体射流处理的PP薄膜表面温度随处理时长的变化关系。