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

Novotny, Z.; Netzer, F. P.; Dohnalek, Z.

doi:10.1016/j.susc.2016.03.020

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

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Abstract

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 CeO₂(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.

Authors:

Novotny, Z. ^[1]; Netzer, F. P. ^[2]; Dohnalek, Z. ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Karl-Franzens Univ., Graz (Austria)

Publication Date:: Tue Mar 22 00:00:00 EDT 2016

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

OSTI Identifier:: 1251559

Alternate Identifier(s):: OSTI ID: 1397444

Report Number(s):: PNNL-SA-114572
Journal ID: ISSN 0039-6028; PII: S0039602816300231

Grant/Contract Number:: KC0301050-47319; AC05-76RL01830

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Surface Science

Additional Journal Information:: Journal Volume: 1021; Journal Issue: C; Journal ID: ISSN 0039-6028

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 77 NANOSCIENCE AND NANOTECHNOLOGY; ceria; CeO2; nanoclusters; graphene; Ru(0001); smoluchowski ripening; STM; AES

Citation Formats


                    Novotny, Z., Netzer, F. P., and Dohnalek, Z. Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system.  United States: N. p., 2016. 
        Web.  doi:10.1016/j.susc.2016.03.020.

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                    Novotny, Z., Netzer, F. P., & Dohnalek, Z. Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system.  United States.  https://doi.org/10.1016/j.susc.2016.03.020

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                    Novotny, Z., Netzer, F. P., and Dohnalek, Z. 2016.  
        "Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system".  United States.  https://doi.org/10.1016/j.susc.2016.03.020.  https://www.osti.gov/servlets/purl/1251559.

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@article{osti_1251559,

  title        = {Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system},

  author       = {Novotny, Z. and Netzer, F. P. and Dohnalek, Z.},

  abstractNote = {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 CeO2(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.},

  doi          = {10.1016/j.susc.2016.03.020},

  url          = {https://www.osti.gov/biblio/1251559},
  journal      = {Surface Science},

  issn         = {0039-6028},

  number       = C,

  volume       = 1021,

  place        = {United States},

  year         = {Tue Mar 22 00:00:00 EDT 2016},

  month        = {Tue Mar 22 00:00:00 EDT 2016}

}

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