Ni ultrathin film development on SrTiO3(100) surface

Vlachos, D.; Kamaratos, M.; Foulias, S.D.; Argirusis, Chr.; Borchardt, Günter

doi:10.1016/j.susc.2003.12.019

Cited by 20 publications

(22 citation statements)

References 37 publications

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“…34 In particular, oxygen adsorption initially causes a rapid WF decrease of the nickel precovered surface, passing through a minimum and then increases up to a maximum value with a following monotonic decrease. In accordance to our recent study of nickel ultrathin films development on the STO(100) surface, 27 Ni grows in the SM (simultaneous multilayers) mode on the surface. The initial decrease of the WF has been attributed to the O adsorption on the step sites whereas the increase is due to the chemisorption of O atoms on the nickel terraces.…”

Section: Oxygen Adsorption On the Nickel Covered Sto(100) Surfacesupporting

confidence: 91%

“…The nickel dose was coverage calibrated into monolayers by the WF changes according to previous results. 27 Spectroscopically pure oxygen was admitted into the chamber through a leak valve. The exposure of oxygen was measured in Langmuirs (1 L = 10 −6 torr · s).…”

Section: Methodsmentioning

confidence: 99%

“…27 It seems that Ni develops in simultaneous multilayers on the surface, gradually approaching a rather metallic character. There are also strong indications that nickel adatoms in the metaloxide interface interact with the outmost surface oxygen atoms resulting in the formation of a time dependent two-dimensional NiO compound.…”

Section: Ni On the Sto(100) Surfacementioning

confidence: 99%

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THE DEVELOPMENT OF NICKEL ULTRA-THIN FILMS AND THE INTERACTION WITH OXYGEN ON THE SrTiO₃(100) SURFACE STUDIED BY SOFT X-RAYS PHOTOELECTRON SPECTROSCOPY

et al. 2004

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The electronic properties of very thin Ni films on the SrTiO 3 (100)-Fe doped surfaces and their interaction with oxygen have been studied by soft X-rays photoelectron spectroscopy measurements. Nickel starts to become metallic on the surface in the very early adsorption stages. Oxygen adsorption on the nickel covered SrTiO 3 (100) surface leads gradually to an almost complete oxidation of the nickel overlayer. The oxidation seems to take place through two different oxidation states, which according to the literature are due to the Ni 2+ and Ni 3+ species. The heating of the O/Ni/SrTiO 3 system at 850 K, causes a partial reduction of the nickel overlayer.

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Section: Oxygen Adsorption On the Nickel Covered Sto(100) Surfacesupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Ni On the Sto(100) Surfacementioning

confidence: 99%

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THE DEVELOPMENT OF NICKEL ULTRA-THIN FILMS AND THE INTERACTION WITH OXYGEN ON THE SrTiO₃(100) SURFACE STUDIED BY SOFT X-RAYS PHOTOELECTRON SPECTROSCOPY

et al. 2004

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“…[49][50][51] With the help of oxygen affinity, Ni atoms could react with substrate O atoms, resulting in the reduction of the high interfacial strain. 52,53 To understand further the roles of the SrO addition in the used se-Ni/Sr/Si catalyst, TEM analysis of the 50 h endurancetested catalyst at 350 C was carried out. As shown in Fig.…”

Section: Stability Testmentioning

confidence: 99%

The difference of roles of alkaline-earth metal oxides on silica-supported nickel catalysts for CO₂ methanation

Guo

Lü

2014

RSC Adv.

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The roles of alkaline-earth metal oxides on CO 2 methanation over modified Ni/SiO 2 catalysts were investigated. Ni/MO/SiO 2 catalysts with variable elements (M ¼ Mg, Ca, Sr and Ba) were prepared by the sequential impregnation method. The results indicated that the presence of SrO promoted the catalytic activity and enhanced the catalyst stability. In addition, BaO addition enhanced the reaction activity, but the Ni/BaO/SiO 2 catalyst deactivated significantly after 50 h of time-on-stream due to the sintering of metallic Ni. Moreover, CaO addition affected negligibly the performance of the Ni/CaO/SiO 2 catalyst, and MgO addition inhibited significantly the methanation performance because of the low reducibility of Ni species.

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“…7 The material is also noted for its photocatalytic 8 and optical properties. 9 Surface terminations of STO have been used as a substrate for the epitaxial growth of metal nanocrystals and thin films, [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and for TiO x ͑Refs. 25-27͒ or SrO ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

SrTiO3(001)−(5×5)−R26.6°reconstruction: A surface resulting from phase

et al. 2007

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Scanning tunneling microscopy ͑STM͒ was used to produce atomic resolution images of the Nb-doped SrTiO 3 ͑001͒-͑ ͱ 5 ϫ ͱ 5͒-R26.6°reconstruction and its precursor surfaces. Low-energy electron diffraction was used to identify the surface structure in combination with the STM imaging. The ͑ ͱ 5 ϫ ͱ 5͒-R26.6°reconstruction was observed growing as an adlayer on top of the underlying terraces. The formation of this structure could routinely be detected by an increase in the crystal's electrical conductivity during ultrahigh vacuum ͑UHV͒ annealing at 1300°C. This rise in conductivity occurs due to significant reduction of the crystal. Scanning electron microscopy ͑SEM͒ on these samples showed small islands with a rectangular base separated by flat regions. Auger electron spectroscopy showed titanium enrichment, and strontium and oxygen depletion of the surface region. The islands seen in the SEM images are TiO crystals, as reported by S. B. Lee et al. ͓Ultramicroscopy 104, 30 ͑2005͔͒. The flat regions between the islands are composed of a Sr adlayer on the surface that is consistent with the ͑ ͱ 5 ϫ ͱ 5͒-R26.6°adatom model of Kubo and Nazoye ͓Phys. Rev. Lett. 86, 1801 ͑2001͔͒. We propose that the TiO islands and the ͑ ͱ 5 ϫ ͱ 5͒-R26.6°Sr adlayer reconstruction form due to phase separation in the surface region of the crystal. This phase separation is driven by oxygen depletion which occurs during high-temperature UHV annealing of the sample.

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Ni ultrathin film development on SrTiO3(100) surface

Cited by 20 publications

References 37 publications

THE DEVELOPMENT OF NICKEL ULTRA-THIN FILMS AND THE INTERACTION WITH OXYGEN ON THE SrTiO₃(100) SURFACE STUDIED BY SOFT X-RAYS PHOTOELECTRON SPECTROSCOPY

THE DEVELOPMENT OF NICKEL ULTRA-THIN FILMS AND THE INTERACTION WITH OXYGEN ON THE SrTiO₃(100) SURFACE STUDIED BY SOFT X-RAYS PHOTOELECTRON SPECTROSCOPY

The difference of roles of alkaline-earth metal oxides on silica-supported nickel catalysts for CO₂ methanation

SrTiO3(001)−(5×5)−R26.6°reconstruction: A surface resulting from phase

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Ni ultrathin film development on SrTiO3(100) surface

Cited by 20 publications

References 37 publications

THE DEVELOPMENT OF NICKEL ULTRA-THIN FILMS AND THE INTERACTION WITH OXYGEN ON THE SrTiO3(100) SURFACE STUDIED BY SOFT X-RAYS PHOTOELECTRON SPECTROSCOPY

THE DEVELOPMENT OF NICKEL ULTRA-THIN FILMS AND THE INTERACTION WITH OXYGEN ON THE SrTiO3(100) SURFACE STUDIED BY SOFT X-RAYS PHOTOELECTRON SPECTROSCOPY

The difference of roles of alkaline-earth metal oxides on silica-supported nickel catalysts for CO2 methanation

SrTiO3(001)−(5×5)−R26.6°reconstruction: A surface resulting from phase

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THE DEVELOPMENT OF NICKEL ULTRA-THIN FILMS AND THE INTERACTION WITH OXYGEN ON THE SrTiO₃(100) SURFACE STUDIED BY SOFT X-RAYS PHOTOELECTRON SPECTROSCOPY

THE DEVELOPMENT OF NICKEL ULTRA-THIN FILMS AND THE INTERACTION WITH OXYGEN ON THE SrTiO₃(100) SURFACE STUDIED BY SOFT X-RAYS PHOTOELECTRON SPECTROSCOPY

The difference of roles of alkaline-earth metal oxides on silica-supported nickel catalysts for CO₂ methanation