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Dec 2008

Volume 15, Issue 1, pp. 1-123

Issue Cover Spotlight Figure

Surf. Sci. Spectra 15, 1 (2008); http://dx.doi.org/10.1116/11.20061006 (13 pages)

Marta Maria Natile, Alessandro Galenda, and Antonella Glisenti
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From La2O3 To LaCoO3: XPS Analysis

Marta Maria Natile, Alessandro Galenda, and Antonella Glisenti

Surf. Sci. Spectra 15, 1 (2008); http://dx.doi.org/10.1116/11.20061006 (13 pages)

Online Publication Date: 7 May 2010

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Nanostructured LaCoO3 powder was prepared by a new approach: cobalt oxide nanoparticles were deposited, by wet impregnation, on the La2O3 surface. The La2O3 support was prepared by precipitation from a basic solution of La(NO3)3⋅6H2O. The precipitate was dried at 353 K for 2 h and calcined at 923 K for 6 h in air. Nanostructured LaCoO3 was obtained by wet impregnation of La2O3 with aqueous solutions of Co(NO3)2⋅6H2O: [Co/La]nomimal = 1.0 (nominal atomic ratio is obtained from the precursors weighed quantities). The obtained suspension was maintained under stirring for two days and then kept in rest for one day. Water was evaporated in air and the obtained solid was dried at 353 K for 2 h and at 923 K for 6 h in air. The thermal treatment in air promotes a solid state reaction between La-O and Co-O and then the formation of LaCoO3.
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61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
81.10.Dn Growth from solutions
81.10.Fq Growth from melts; zone melting and refining
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
81.40.Gh Other heat and thermomechanical treatments
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

CuO/La0.6Sr0.4Co0.2Fe0.8O3-δ Powder by XPS

Marta Maria Natile, Alessandro Galenda, Fabio Poletto, and Antonella Glisenti

Surf. Sci. Spectra 15, 14 (2008); http://dx.doi.org/10.1116/11.20070802 (9 pages)

Online Publication Date: 6 July 2010

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A CuO/La0.6Sr0.4Co0.2Fe0.8O3-δ supported system was obtained by depositing, by wet impregnation, 10 wt% CuO loading on the La0.6Sr0.4Co0.2Fe0.8O3-δ surface. The surface properties are investigated by means of XPS. Besides the wide scan spectrum, detailed spectra for the La 3d, Sr 3d, Co 2p, Fe 2p, Cu 2p, O 1s, and C 1s regions, and related data, are presented and discussed.
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82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation

Piranha Treated Titanium Compared to Passivated Titanium as Characterized by XPS

Holly J. Martin, Kirk H. Schulz, and Keisha B. Walters

Surf. Sci. Spectra 15, 23 (2008); http://dx.doi.org/10.1116/11.20070702 (8 pages)

Online Publication Date: 24 August 2010

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Titanium is commonly used as an implant material because of its strength, durability, density, and ability to passivated. Two titanium surfaces were compared, one produced by passivation following the ASTM F87 standard and one produced by treating coupons with piranha. The XPS spectra of the two treated titanium surfaces were collected with a Mg Kα (1253.6 eV) x-ray source operated at 300 W and 15 kV. This report includes XPS spectra of the elements associated with the treated titanium, which consisted of carbon, oxygen, and titanium. Significantly more titanium and oxygen were seen when comparing the piranha treated titanium to the passivated titanium, while significantly more carbon was present on the passivated titanium as compared to the piranha treated titanium.
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81.65.Rv Passivation
79.60.Bm Clean metal, semiconductor, and insulator surfaces
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
81.05.Bx Metals, semimetals, and alloys

Ag/Cu(100) Surface Alloy and Polycrystalline Cu(Ag) Alloy Studied by XPS

Petri Jussila, Kimmo Lahtonen, Markus Lampimäki, Mika Hirsimäki, Mari Honkanen, Toivo Lepistö, Pekka Taskinen, and Mika Valden

Surf. Sci. Spectra 15, 31 (2008); http://dx.doi.org/10.1116/11.20060701 (10 pages)

Online Publication Date: 3 January 2011

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In this work, polycrystalline Cu(Ag) bulk alloy (1 wt.% Ag) and Ag/Cu(100) surface alloy (0.9 ML Ag) have been characterized by x-ray photoelectron spectroscopy (XPS) employing Al Kα and Mg Kα radiation. XPS spectra of the principal core levels (Cu, Ag) are presented together with XAES (x-ray induced Auger electron spectroscopy) spectra of the Cu LMM transition. The samples were prepared in situ by argon ion sputtering at room temperature and subsequent annealing at 700 K. Ag overlayer was deposited on the Cu(100) surface by a resistively heated Ag evaporator. The absence of contaminants such as C or O was confirmed by XPS. Together, the industrial Cu(Ag) alloy and the well defined Ag/Cu(100) model system serve as a template for studies of nanoscale surface oxidation and segregation phenomena.
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81.15.Cd Deposition by sputtering
61.80.Fe Electron and positron radiation effects
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization

La0.6Sr0.4Co1-yFeyO3-δ Powders Studied by X-ray Photoelectron Spectroscopy

Fabio Poletto, Marta Maria Natile, Alessandro Galenda, and Antonella Glisenti

Surf. Sci. Spectra 15, 41 (2008); http://dx.doi.org/10.1116/11.20070201 (18 pages)

Online Publication Date: 6 January 2011

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Perovskite-type oxides, ABO3, are known to be very good oxidation catalysts. The redox properties of the B cation, the availability of weakly bonded oxygen at the surface and the presence of lattice defects have been often claimed as responsible for their catalytic activity. Moreover, their performances can be improved if they are nanodimensioned. The present study focuses on the development of new LaCoO3-based catalysts for alcohol (such as methanol, ethanol) steam reforming. Several La0.6Sr0.4Co1-yFeyO3-δ (y=0.2, 0.5, 0.8) were prepared by the citrate gel method and calcined at 1073 K for 5 h in air. Herein, the influence of the cobalt/iron ratio on the surface properties was investigated.
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81.07.Wx Nanopowders
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
81.40.Gh Other heat and thermomechanical treatments
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
79.60.Bm Clean metal, semiconductor, and insulator surfaces

Core Level XPS of Elemental Hafnium and Hafnium Dioxide

R. L. Miller, S. H. McKinney, and A. R. Chourasia

Surf. Sci. Spectra 15, 59 (2008); http://dx.doi.org/10.1116/11.20060801 (11 pages)

Online Publication Date: 14 January 2011

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Core levels and x-ray excited Auger regions of hafnium and oxygen in elemental hafnium and hafnium dioxide have been investigated by x-ray photoelectron spectroscopy. The zirconium Lα radiation (energy = 2042.4 eV) has been used for this purpose. The XPS data in the 3d, 4d and 4f core levels, and the x-ray excited MNN Auger region of hafnium and in the 1s core level of oxygen have been recored in these materials. The zirconium radiation enabled accessing in the 3d core levels of hafnium. The data set will serve as a source of valuable information for analyzing spectra associated with hafnium and oxygen in hafnium dioxide.
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73.20.-r Electron states at surfaces and interfaces
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)

Interaction of Iron Tetrasulfophthalocyanine with TiO2 Nanoparticles by XPS

P. Delichere, S. Daniele, L. G. Hubert-Pfalzgraf, and A. B. Sorokin

Surf. Sci. Spectra 15, 70 (2008); http://dx.doi.org/10.1116/11.20051110 (7 pages)

Online Publication Date: 21 January 2011

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Mesoporous iron tetrasulfophthalocyanine/TiO2 nanoparticles were prepared by a one-pot hydrolytic process starting from modified titanium alkoxide. The material has been characterized by elemental analysis, Fourier transform infrared spectroscopy (FTIR), x-ray diffraction powder (XDR), transmission electronic microscopy (TEM), nitrogen absorption-desorption isotherm (BET), diffuse reflectance UV-visible spectrocopy and x-ray photoelectron spectroscopy (XPS). It contains anatase as the main crystalline phase (85%) along with brookite. Average crystallites size gave around 10 and 12 nm, for anatase and brookite, respectively. Diffuse reflectance UV-visible spectroscopy confirmed the presence of intact iron tetrasulfophtahlocyanine (FePcS), predominantly in dimeric form. The chemical interaction of the FePcS with the TiO2 nanoparticles was studied by using FTIR and XPS techniques which indicated that FePcS is covalently bonded onto TiO2 nanoparticles, leading to a stable hybrid system. Careful attention to binding energies of O 1s and S 2p elements in the nanohybrid material and in FePcS complex helps to shed light on this point.
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82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
81.07.Pr Organic-inorganic hybrid nanostructures
81.07.Bc Nanocrystalline materials
81.16.-c Methods of micro- and nanofabrication and processing
78.67.Rb Nanoporous materials
61.46.-w Structure of nanoscale materials
68.43.Mn Adsorption kinetics
68.43.Nr Desorption kinetics

Characterization of Cr(III) Compounds of O, OH, F and Cl by XPS

Thomas Gross, Dieter Treu, Ercan Ünveren, Erhard Kemnitz, and Wolfgang E. S. Unger

Surf. Sci. Spectra 15, 77 (2008); http://dx.doi.org/10.1116/11.20080801 (47 pages)

Online Publication Date: 17 March 2011

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Cr2O3, CrCl3, α-CrF3, CrF3⋅3H20 and Cr(OH)3 were investigated by x-ray photoelectron (XPS) and x-ray excited Auger electron spectroscopy (XAES) using a latest generation XPS spectrometer. Non-conductive powders are analyzed with ultimate energy resolution. Multiplet splitting features and/or satellite emission were observed in the Cr 2p and Cr 3s spectra. Cr(III) compounds are of interest in many applications as for example in corrosion and catalysis. Chromia and chromium-III-fluoride activated by reaction with fluoroalkanes are very promising industrial catalysts. It is the aim of this selection of spectral reference data to enable deeper insight in the formation of catalytically active fluorinated chromia phases by using XPS analysis.
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82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
79.60.-i Photoemission and photoelectron spectra
79.20.Fv Electron impact: Auger emission
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
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