Thermal behavior of MOCVD-grown Cu-clusters on ZnO(101̄0)

Kroll, Martin; Löber, Thomas; Schott, Vadim; Wöll, Christof; Köhler, Ulrich

doi:10.1039/c2cp22901c

Cited by 14 publications

(34 citation statements)

References 22 publications

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“…Therefore, as a first step to better understand the complex behavior of the Cu/ZnO system, the interaction of Cu with low‐indexed surfaces of ZnO single crystals as a well‐defined model system was investigated with a broad spectrum of surface science tools. For the polar ZnO surfaces 5–9 and the non‐polar surfaces 10, 11 Cu‐cluster formation is found with the appearance of 3D‐clusters already in the sub‐monolayer range. The structural and the chemical state at the cluster/oxide interface on the other hand are quite unclear.…”

Section: Introductionmentioning

confidence: 94%

The thermally induced interaction of Cu and Au with ZnO single crystal surfaces

Köhler

Kroll

Löber

et al. 2013

Physica Status Solidi (b)

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The reaction of Cu‐clusters with a polar and a mixed terminated single crystalline ZnO‐substrate upon thermal treatment in UHV is studied in comparison with Au‐films. Scanning tunneling microcopy and spectroscopy in combination with photoemission experiments reveal the geometrical and chemical changes in the Cu‐cluster system on ZnO(0001)‐Zn and ZnO(10$\overline {1} $0) upon annealing up to 770 K. On ZnO($10\overline {1} 0$) the Cu‐clusters show a roof like outline with Cu(111) side facets. The data points to a Cu(110) interface with the ZnO‐substrate. The interface of the Cu‐clusters and the ZnO‐substrate was investigated by the controlled removal of clusters using STM‐tip manipulation exposing the “footprints” of the clusters. On both investigated ZnO surfaces an entrenching of the Cu‐clusters during annealing was found which partly explains the observed decrease of the amount of Cu visible above the ZnO‐substrate level upon annealing. Even at higher annealing temperature the main body of the cluster surface is still pure copper. No large scale oxidation or brass formation was found. Scanning tunneling spectroscopy shows an increased density of occupied states at the cluster perimeter which is possibly relevant as an active site in catalysis.

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Section: Introductionmentioning

confidence: 94%

The thermally induced interaction of Cu and Au with ZnO single crystal surfaces

Köhler

Kroll

Löber

et al. 2013

Physica Status Solidi (b)

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“…This oxidation state can be confirmed by the XPS Cu 2p region to differentiate Cu + and Cu 2+ and by the Cu L 3 M 45 M 45 Auger region to differentiate Cu 0 and Cu + . 44,45 …”

Section: Resultsmentioning

confidence: 99%

Transmetalation Process as a Route for Preparation of Zinc-Oxide-Supported Copper Nanoparticles

et al. 2016

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Supported nanoparticulate materials have a variety of uses, from energy storage to catalysis. In preparing such materials, precision control can often be achieved by applying chemical deposition methods. However, ligand removal following the initial deposition presents a substantial challenge because of potential surface contamination. Traditional approaches normally include multistep processing and require a substantial thermal budget. Using transmetalation chemistry, it is possible to circumvent both disadvantages and prepare chemically reactive copper nanoparticles supported on a commercially available ZnO powder material by metal-organic vapor copper deposition followed by very mild annealing to 350 K. The self-limiting copper deposition reaction is used to demonstrate the utility of this approach for hexafluoroacetylacetonate-copper-vinyltrimethylsilane, Cu(hfac)VTMS, reacting with ZnO. The low-temperature transmetalation is confirmed by a combination of spectroscopic studies. Model density functional theory calculations are consistent with a thermodynamic driving force for the process.

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“…increases with the growth temperature [18][19][20]. Very small surface roughness over large area in all these films makes them suitable for 2D device structure growth on ZnO surface.…”

Section: Morphological Studymentioning

confidence: 97%

Role of growth temperature on the structural, optical and electrical properties of ZnO thin films

Kumar

et al. 2015

Journal of Alloys and Compounds

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Thermal behavior of MOCVD-grown Cu-clusters on ZnO(101̄0)

Cited by 14 publications

References 22 publications

The thermally induced interaction of Cu and Au with ZnO single crystal surfaces

The thermally induced interaction of Cu and Au with ZnO single crystal surfaces

Transmetalation Process as a Route for Preparation of Zinc-Oxide-Supported Copper Nanoparticles

Role of growth temperature on the structural, optical and electrical properties of ZnO thin films

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