skip to main content


Title: Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system

In this study, the growth of ceria nanoclusters on single-layer graphene on Ru(0001) has been examined, with a view towards fabricating a stable system for model catalysis studies. The surface morphology and cluster distribution as a function of oxide coverage and substrate temperature has been monitored by scanning tunneling microscopy (STM), whereas the chemical composition of the cluster deposits has been determined by Auger electron spectroscopy (AES). The ceria nanoparticles are of the CeO 2(111)-type and are anchored at the intrinsic defects of the graphene surface, resulting in a variation of the cluster densities across the macroscopic sample surface. The ceria clusters on graphene display a remarkable stability against reduction in ultrahigh vacuum up to 900 K, but some sintering of clusters is observed for temperatures > 450 K. The evolution of the cluster size distribution suggests that the sintering proceeds via a Smoluchowski ripening mechanism, i.e. diffusion and aggregation of entire clusters.
 [1] ;  [2] ;  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Karl-Franzens Univ., Graz (Austria)
Publication Date:
Report Number(s):
Journal ID: ISSN 0039-6028; PII: S0039602816300231
Grant/Contract Number:
KC0301050-47319; AC05-76RL01830
Accepted Manuscript
Journal Name:
Surface Science
Additional Journal Information:
Journal Volume: 1021; Journal Issue: C; Journal ID: ISSN 0039-6028
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; ceria; CeO2; nanoclusters; graphene; Ru(0001); smoluchowski ripening; STM; AES
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1397444