Atomic structure of Pt nanoclusters supported by graphene/Ir(111) and reversible transformation under CO exposure

Franz, Dirk; Blanc, Nils; Coraux, Johann; Renaud, Gilles; Runte, Sven; Gerber, Timm; Busse, Carsten; Michely, Thomas; Feibelman, Peter J.; Hejral, Uta; Stierle, Andreas

doi:10.1103/PhysRevB.93.045426

Title: Atomic structure of Pt nanoclusters supported by graphene/Ir(111) and reversible transformation under CO exposure

Journal Article · Tue Jan 26 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.045426· OSTI ID:1248613

Franz, Dirk ^[1]; Blanc, Nils ^[2]; Coraux, Johann ^[2]; Renaud, Gilles ^[3]; Runte, Sven ^[4]; Gerber, Timm ^[5]; Busse, Carsten ^[4]; Michely, Thomas ^[4]; Feibelman, Peter J. ^[6]; Hejral, Uta ^[7]; Stierle, Andreas ^[7]

Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. of Hamburg (Germany); Univ. Siegen, Siegen (Germany)
Univ. Grenoble Alpes, Grenoble (France); CNRS, Inst Neel, Grenoble (France)
Univ. Grenoble Alpes, Grenoble (France); Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA), Grenoble (France)
Univ. zu Koln (Germany)
Univ. zu Koln (Germany); Peter Grunberg Inst., Julich (Germany)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. of Hamburg (Germany)

We investigate the atomic structure of graphene/Ir(111) supported platinum clusters with on average fewer than 40 atoms by means of surface x-ray diffraction (SXRD), grazing incidence small angle x-ray scattering (GISAXS), and normal incidence x-ray standing waves (NIXSW) measurements, in comparison with density functional theory calculations (DFT). GISAXS revealed that the clusters with 1.3 nm diameter form a regular array with domain sizes of 90 nm. SXRD shows that the 1–2 monolayer high, (111) oriented Pt nanoparticles grow epitaxially on the graphene support. From the combined analysis of the SXRD and NIXSW data, a three-dimensional (3D) structural model of the clusters and the graphene support can be deduced which is in line with the DFT results. For the clusters grown in ultrahigh vacuum the lattice parameter is reduced by (4.6±0.1)% compared to bulk platinum. The graphene layer undergoes a strong Pt adsorption induced buckling, caused by a rehybridization of the carbon atoms below the cluster. Lastly, in situ observation of the Pt clusters in CO and O₂ environments revealed a reversible change of the clusters' strain state while successively dosing CO at room temperature and O₂ at 575 K, pointing to a CO oxidation activity of the Pt clusters.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1248613

Alternate ID(s):: OSTI ID: 1236086

Report Number(s):: SAND-2016-0693J; 618860

Journal Information:: Physical Review B, Vol. 93, Issue 4; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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