Possible Mechanisms
1) O2 and Cu2+ compete for e- from Si:
Cu2+ + 2e- ? Cu
O2 + 4H+ + 4e- ? 2H2O
2) Metal Induced Oxidation (Ohmi, et al., JECS 144 (9) p.3275)
Si
+ O2
Si
SiO2
+ HF
Si
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