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Abstract
Atomically well-defined TiO2 is the prerequisite for both interfacial-physics engineering and photocatalytic-mechanism understanding. Here, we report the preparation of atomically flat rutile TiO2(100) over a centimeter scale by high-temperature annealing in ultrahigh vacuum and detailedly traced its microscopic evolution dynamics towards atomic smoothness. The reflection high-energy electron-diffraction pattern and the scanning topographic image both show an atomically flat surface over a sub–square-centimeter area. These results provide a microscopic understanding of the methodologies for obtaining atomically well-defined surfaces.
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