Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system
作者： Z. Novotny , F.P. Netzer , Z. Dohnálek
DOI: 10.1016/J.SUSC.2016.03.020
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摘要: Abstract The growth of ceria nanoclusters on single-layer graphene Ru(0001) has been examined, with a view towards fabricating stable system for model catalysis studies. surface morphology and cluster distribution as function oxide coverage substrate temperature monitored by scanning tunneling microscopy (STM), whereas the chemical composition deposits determined Auger electron spectroscopy (AES). nanoparticles are CeO2(111)-type anchored at intrinsic defects surface, resulting in variation densities across macroscopic sample surface. clusters display remarkable stability against reduction ultrahigh vacuum up to 900 K, but some sintering is observed temperatures > 450 K. evolution size suggests that proceeds via Smoluchowski ripening mechanism, i.e. diffusion aggregation entire clusters.
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