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  • Kühn, Gerhard (1) (entfernen)

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  • 2009 (1) (entfernen)

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  • Zeitschriftenartikel (1) (entfernen)

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  • ESCA/XPS (1)
  • Photoelectron spectroscopy (1)
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  • Poly(propylene) (PP) (1)
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  • X-ray (1)

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Photoelectron spectroscopy on organic surfaces: X-ray degradation of oxygen-plasma-treated and chemically reduced poly(propylene) surfaces in comparison to conventional polymers (2009)
Gross, Thomas ; Kühn, Gerhard ; Unger, Wolfgang
The X-ray-induced sample damage during mono XPS analysis of an oxygen-plasma-oxidized and subsequently wet-chemically reduced poly(propylene) film was investigated as a showcase for plasma-modified or plasma-deposited samples. By doing this, the degradation index approach as introduced by Beamson and Briggs in the Scienta ESCA300 high-resolution XPS database of organic polymers has been adopted. As to be expected, the sample degrades by loosing oxygen as revealed by observation of decreasing O/C and COR/Csum ratios. However, the X-ray degradation indices are definitely higher than those of conventional reference polymers. Moreover, the COR/Csum degradation index is significantly higher in comparison with one obtained for the O/C ratio. In that context, there is no difference between the plasma sample and a conventional poly(vinyl alcohol) polymer. It is concluded that for reliable quantitative surface chemical analysis, the quality of spectra in terms of acquisition times must be optimized aimed to a minimization of X-ray degradation. Finally, it is proposed to describe the photon flux of an X-ray gun in an XPS experiment, which defines the degradation rate at the end, by using the sample current simply measured with a carefully grounded sputter-cleaned reference silver sample.
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