Abstract
Gold nanoparticles, supported on oxides, have received considerable attention for their wide range of applications. Using dewetted gold particles on single-crystal oxide substrates as model systems, the unusual particle size distribution and relevant mechanism are investigated. Gold particles usually exhibit unimodal size distributions; however, when the growth of oxide bases is detected underneath these gold particles, particles have an unusual bimodal size distributions. A simple model, considering the effect of growing oxide bases on gold adatom migration, is proposed to explain this bimodal distribution. These results demonstrate the possibility of controlling the migration of surface adatoms and subsequent particle size at high temperatures.
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