PHI XPS instruments can be used to detect ultra thin surface
modified layers and quantify the impact of the modification. In this
case, the modification incorporated oxygen into the surface of the
polyethylene as indicated by the dramatic increase of the O 1s peak
after plasma treatment.
XPS spectra of a polyethylene surface before and after plasma
modification demonstrating the surface sensitivity of PHI XPS systems
for detecting these ultra thin surface layers.
Sample is courtesy of N. De Geyter, University of Ghent, Plasma Technology Research Unit, Applied Physics Dept. , Belgium