Use of Surface Signal Enhancement Techniques in X-ray Photoelectronic Studies of Carbon Fibre Surfaces.

摘要

There have been many studies of the chemical changes induced by oxidative treatments of carbon fiber surfaces with the attempt to understand the nature of fiber/matrix interaction in carbon fiber/epoxy composites C.G. 1-5. Most of the more successful studies utilized x-ray photoelectron spectroscopy for chemical groups identification. However, there are many conflicting reports on the amount and type of oxygen and nitrogen functionally induced by similar surface treatments. This arises because most commercially successful treatments only alter the first few atomic layers of the fiber itself and signals from these functional groups are swamped by the graphitic backbone in the carbon's spectrum. It will be shown here, that by using the small spot and small acceptance angle features of the PHI 5400 X-ray photoelectron spectrometer signals from these surface features can be enhanced dramatically. (This technique is well established for surface signal enhancement for flat metal and polymer samples but has not been exploited for fiber surface studies.).