Figure 12
Survey XPS spectra at the Al2O3 ball scar formed against the UNCD(0%H2) films sliding in two different tribo-condition: ambient (ai) and high vacuum (aii) condition, (b to e) high resolution XPS: O1s peaks in ambient (bi) and high vacuum (bii), C1s peaks in ambient (c) and in high vacuum (d) and Al2p peaks in ambient (ei) and in high vacuum (eii), optical micrograph of ball scars where circles show x-ray exposed region during XPS: (fi) in ambient and (fii) in high vacuum conditions.
