Abstract
In this study we investigate the effects of the particle size on the oxidation of supported Cu particles under equivalent experimental conditions 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, the oxidation of Cu 0 to Cu 2+ 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 Cu 2+-oxide proceeds significantly faster than in the case of 15 nm particles. At both temperatures Cu 0 was oxidised to Cu 2+-oxide through an intermediate Cu +-oxide.
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