R. Vanwijk et al., XPS NRA INVESTIGATIONS OF PARTICLE-SIZE EFFECTS DURING THE OXIDATION OF CU PARTICLES SUPPORTED ON OXIDIZED SI(100)/, Applied surface science, 90(3), 1995, pp. 261-269
Citations number
26
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical","Materials Science, Coatings & Films
In this study we investigate the effects of the particle size on the o
xidation of supported Cu particles under equivalent experimental condi
tions with respect to temperature and pressure. We compare the results
of oxidation of 4 and 15 nm Cu particles supported on oxidised Si(100
) at room temperature and 573 K. At room temperature and p = 10 Pa, th
e oxidation of Cu-0 to Cu2+ at the surface of 4 nm particles proceeds
significantly slower than in the case of 15 nm particles. At 573 K and
p = 0.1 Pa, a reverse trend is observed: oxidation of 4 nm particles
from Cu-0 to a Cu2+-oxide proceeds significantly faster than in the ca
se of 15 nm particles, At both temperatures Cu-0 was oxidised to Cu2+-
oxide through an intermediate Cu C-oxide.