Electronic structure of ultrathin ordered iron oxide films grown onto Pt(111)

Schedel‐Niedrig, Th.; Weiß, Werner; Schlögl, Robert

doi:10.1103/physrevb.52.17449

Cited by 230 publications

(150 citation statements)

References 37 publications

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“…The Fe 2p core levels are split into 2p 1/2 and 2p 3/2 components due to the spin-orbit coupling. The Fe 2p 3/2 core level appears at 711.2 eV, which is characteristic for the Fe 3+ species and agree well with the literature data [26,27]. ObviObviously, the metallic iron nanoparticles resulted from the heat treatment in reduction atmosphere were partially oxidized by oxygen and/or water vapor (moisture) during sample transfer in air.…”

Section: Resultssupporting

confidence: 79%

Iron impregnation on the amorphous shell of vapor grown carbon fibers and the catalytic growth of secondary nanofibers

Xia

Bitter

et al. 2009

Diamond and Related Materials

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Vapor grown carbon fibers (VGCFs) with diameters of several microns were synthesized and investigated by high resolution transmission electron microscopy. It was found that the shell of the VGCFs consisted of densely-packed domains embedded in loosely-packed matrix, and both were highly amorphous. Regular edge planes as observed on the surface of fishbone nanofibers do not exist on VGCFs. Hence, surface treatment is more important for the deposition of catalysts. Ammonium ferric citrate (AFC) was employed for the impregnation of iron, where the high viscosity of the aqueous solution of AFC is beneficial. Calcination was found to be a key step to improve the dispersion of the iron particles, which can be attributed to enhanced interactions between iron and carbon due to the gasification of carbon occurring at the iron-carbon interface. Quantitative analysis by X-ray photoelectron spectroscopy showed that the calcination of the supported AFC led to a higher atomic concentration of iron on the surface, indicating smaller particle size and higher dispersion. Secondary carbon nanofibers were grown subsequently on the VGCFs from cyclohexane. The specific surface area was enhanced considerably, from less than 1 m 2 g -1 to 106 m 2 g -1 after the growth of the secondary nanofibers. The obtained composites are promising materials as structured support in heterogeneous catalysis.

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Section: Resultssupporting

confidence: 79%

Iron impregnation on the amorphous shell of vapor grown carbon fibers and the catalytic growth of secondary nanofibers

Xia

Bitter

et al. 2009

Diamond and Related Materials

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“…2 are straightforwardly assigned to O 2p states but the region below 5 eV is more difficult to interpret due to the mixed TM 3d-O 2p states. VB spectra qualitatively agree with the previous studies 21,40,50,51 , in the present work the spectral features are much better resolved. Pt 5d states still contribute to the spectra taken in normal electron emission geometry whereas they nearly vanish in grazing geometry.…”

Section: Discussionsupporting

confidence: 82%

“…Despite the differences in the intensity ratios of the main lines to the satellite peaks, c(4×2) and (9×2) phases of the cobalt oxides grown on Pd(100) demonstrate similar BEs 40 . XPS spectrum of FeO films is identical to the previously published data 21 .…”

Section: Discussionsupporting

confidence: 73%

“…The findings of earlier photoelectron diffraction (PD) 18 , low energy electron diffraction (LEED), and scanning tunneling microscopy (STM) 19 studies mostly agree with the recent ones 20 , that the FeO films grown on Pt(111) have a lattice mismatch which is revealed as a superstructure (Moiré patterns). X-ray photoelectron spectroscopy (XPS) studies show that the oxidation state of Fe is 2+; indicating the formal charges are close to the charges in FeO stoichiometry 21,22 . CoO grows on Pt(111) similarly 23 , with the Co possessing formal charges close to those in bulk CoO 24 but much less is known about the electronic structure of this film.…”

Section: Introductionmentioning

confidence: 99%

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Identification of the electronic structure differences between polar isostructural FeO and CoO films by core-level soft x-ray spectroscopy

et al. 2013

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The electronic properties of the FeO and CoO single layer thin films on Pt(111) were examined by core level soft X-ray spectroscopy. These oxygen terminated films are bilayer-thick and isostructural, Pt, Fe-Co, and O atoms stacked with small lateral shifts due to incommensurate relation with Pt(111). Probing occupied and unoccupied states projected on the oxygen atoms revealed states at the Fermi level suggesting orbital mixing with the metal substrate and also indicated an anisotropy in transition metal-oxygen bonding geometry. The differences in the core level spectral features were attributed to the substrate induced modification of the charge transfer energy and with an additional valence electron on Co.

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“…The shapes and relative areas of the iron L 2,3 peaks acquired using EELS (Figure 3a) were found to be consistent with those reported for aFe 2+ -containing oxide. 62,63 Further characterization of the iron valence states was performed using XPS (Figure 3b). The Fe 2p 3/2 spectrum of the nanocubes displayed a major peak at 710.6 eV, which is consistent with the 710.5 eV Fe 2p 3/2 peak position of Fe x O.…”

Section: Chemistry Of Materialsmentioning

confidence: 99%

Nickel/Iron Oxide Nanocrystals with a Nonequilibrium Phase: Controlling Size, Shape, and Composition

Bau

Marenco

et al. 2014

Chem. Mater.

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/npsi/ctrl?action=rtdoc&an=21272906&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21272906&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca.

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Electronic structure of ultrathin ordered iron oxide films grown onto Pt(111)

Cited by 230 publications

References 37 publications

Iron impregnation on the amorphous shell of vapor grown carbon fibers and the catalytic growth of secondary nanofibers

Iron impregnation on the amorphous shell of vapor grown carbon fibers and the catalytic growth of secondary nanofibers

Identification of the electronic structure differences between polar isostructural FeO and CoO films by core-level soft x-ray spectroscopy

Nickel/Iron Oxide Nanocrystals with a Nonequilibrium Phase: Controlling Size, Shape, and Composition

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