Abstract
We have investigated the interaction of CO with Ir/Au{111} bimetallic surfaces, and the influence of morphology changes as Ir moves sub-surface into the Au bulk, using reflection–absorption infrared spectroscopy (RAIRS). The presence of Ir stabilises CO on exposed regions of the Au surface at temperatures up to around 200K: we attribute this to low-coordinated Au sites, probably associated with lifting of the clean-surface ‘herringbone’ reconstruction by Ir deposition. The highest density of active Au sites is obtained after annealing the bimetallic surface to 500–600K: we attribute this to morphology changes associated with the movement of Ir into bulk Au.
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