X-ray standing waves and hard X-ray photoelectron spectroscopy at the insertion device beamline ID32

Zegenhagen, J.; Detlefs, Blanka; Lee, Tien‐Lin; Thieß, S.; Isérn, H.; Petit, L.; André, Lionel; Roy, J.; Mi, Y. Y.; Joumard, Isabelle

doi:10.1016/j.elspec.2009.09.008

Cited by 50 publications

(35 citation statements)

References 33 publications

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“…The experiments were performed at beamline ID32 of the ESRF. 31 DIP films were prepared and studied in situ under ultrahigh-vacuum conditions. A separate preparation chamber contained a Knudsen cell, a quartz crystal microbalance, installations for Ar + sputtering, and a temperature-controlled sample stage.…”

Section: Methodsmentioning

confidence: 99%

Exploring the bonding of large hydrocarbons on noble metals: Diindoperylene on Cu(111), Ag(111), and Au(111)

et al. 2013

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We present a benchmark study for the adsorption of a large π -conjugated organic molecule on different noble metal surfaces, which is based on x-ray standing wave (XSW) measurements and density functional theory calculations with van der Waals (vdW) interactions. The bonding distances of diindenoperylene on Cu(111), Ag(111), and Au (111) surfaces (2.51, 3.01, and 3.10Å, respectively) determined with the normal-incidence XSW technique are compared with calculations. Excellent agreement with the experimental data, i.e., deviations less than 0.1Å, is achieved using the Perdew-Burke-Ernzerhof (PBE) functional with vdW interactions that include the collective response of substrate electrons (the PBE + vdW surf method). It is noteworthy that the calculations show that the vdW contribution to the adsorption energy increases in the order Au(111) < Ag(111) < Cu(111).

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Section: Methodsmentioning

confidence: 99%

Exploring the bonding of large hydrocarbons on noble metals: Diindoperylene on Cu(111), Ag(111), and Au(111)

et al. 2013

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“…34 The local ultrahigh vacuum chamber was equipped with a hemispherical electron analyzer (PerkinElmer PHI model 10-360, r = 150 mm) at an angle of 45…”

Section: Methodsmentioning

confidence: 99%

Normal-incidence x-ray standing-wave study of copper phthalocyanine submonolayers on Cu(111) and Au(111)

et al. 2011

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Understanding the adsorption and growth mechanisms of large π -conjugated molecules on noble metal surfaces is a crucial aspect for designing and optimizing electronic devices based on organic materials. The investigation of adsorption heights for these molecules on different surfaces can be a direct measure for the strength of the adsorbate-substrate interaction, and gives insight into the fundamental bonding mechanisms. However, the adsorption strength is often also influenced by intermolecular (lateral) interactions which cause, e.g., island formation in the submonolayer regime and influence the adsorption geometry of individual molecules. The lateral structure can then dominate the vertical structure formation and influence the adsorbate-substrate interaction. In this context, the adsorption of copper-phthalocyanines on noble metal surfaces [Au(111), Ag(111), and Cu (111)] represents an ideal model system since the lateral structure formation, as well as the molecular adsorption geometries, strongly depend on coverage and temperature, and hence can be tuned easily. We demonstrate that for CuPc/Au(111), a system dominated by physisorption, the adsorption height of the molecules is independent from the lateral adsorption geometry. In contrast, a strong chemisorption of CuPc on Cu(111) shows a clear gradient in the interaction strength: Individual molecules in diluted phases are significantly stronger bonded than molecules in dense phases. This finding quantifies the increase of the exchange correlation in the binding process, which goes along with the tendency to a more site-specific adsorption geometry at small coverages.

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“…To suppress Ir fluorescence background detectors were protected by a 1 mm thick Al filter. The NIXSW [24] experiments were performed at the ESRF beam line ID32 [29]. The standing wave was excited using the Ir(111) reflection at an incident photon energy of 2801 eV.…”

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confidence: 99%

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

et al. 2016

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We have investigated 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 15 small angle x-ray scattering (GISAXS) and normal incidence x-ray standing waves (NIXSW) measurements, in comparison with density functional theory calculations (DFT). GISXAS 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 3D structural model of the 20 clusters and the graphene support can be deduced which is in line with the DFT results. For the clusters grown in ultra high 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 re-hybridisation of the carbon atoms below the cluster. In-situ observation of the Pt clusters in CO and O2 environments revealed a reversible change of the clusters' strain state while successively 25 dosing CO at room temperature and O2 at 575 K, pointing to a CO oxidation activity of the Pt clusters.2

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X-ray standing waves and hard X-ray photoelectron spectroscopy at the insertion device beamline ID32

Cited by 50 publications

References 33 publications

Exploring the bonding of large hydrocarbons on noble metals: Diindoperylene on Cu(111), Ag(111), and Au(111)

Exploring the bonding of large hydrocarbons on noble metals: Diindoperylene on Cu(111), Ag(111), and Au(111)

Normal-incidence x-ray standing-wave study of copper phthalocyanine submonolayers on Cu(111) and Au(111)

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

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