A new facility for inert transfer of reactive samples to XPS equipment

Grünert, Wolfgang; Feldhaus, R.; Anders, K.; Shpiro, E. S.; Antoshin, G. V.; Миначев, Х. М.

doi:10.1016/0368-2048(86)80017-2

Cited by 47 publications

(36 citation statements)

References 4 publications

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“…26 BE peaks of various core levels of W confirm that W is present in the oxidized state. 27,28 BE values of the core levels are in good agreement with that of the sub-stoichiometric WO 3 . Table II lists the BE values of subshells of the fourth orbit of W. These values are higher than those for elemental W and less than that for stoichiometric WO 3 .…”

Section: X-ray Photoelectron Spectroscopysupporting

confidence: 70%

Effect of Substrate Temperature on the Properties of Sprayed WO3 Thin Films Using Peroxotungstic Acid and Ammonium Tungstate: A Comparative Study

Ganbavle

Kim

Rajpure

2015

Journal of Elec Materi

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A comparative study on the physicochemical properties of tungsten oxide (WO 3 ) thin films synthesized using peroxotungstic acid (PTA) and ammonium tungstate (AT) by simple spray pyrolysis technique is reported. X-ray diffraction patterns show that the films deposited using both the precursors are polycrystalline with monoclinic crystal structure. The x-ray photoelectron spectroscopy studies confirm that the films are sub-stoichiometric with O/W ratios of 2.93 and 2.87, respectively, for typical PTA and AT films. Tungsten (W) exists in two chemical states, 5+ and 6+. Scanning electron microscopy images show the uniform and dense network of wires in PTA films, while the films deposited using AT possess a porous structure with small grains. Electrical and dielectric studies show that films are highly resistive and possess high dielectric constant. The near ultra-violet, blue, green and weak red emissions due to defects were observed in the photoluminescence studies. Properties of the WO 3 thin films reported here are suitable for gas sensor applications. Films deposited using PTA are more functional than those deposited using AT.

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Section: X-ray Photoelectron Spectroscopysupporting

confidence: 70%

Effect of Substrate Temperature on the Properties of Sprayed WO3 Thin Films Using Peroxotungstic Acid and Ammonium Tungstate: A Comparative Study

Ganbavle

Kim

Rajpure

2015

Journal of Elec Materi

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“…In [18]. Although the variation between these values is quite high, all authors report binding energies similar or higher compared to their respectively cited WO 3 binding energies.…”

Section: Discussionmentioning

confidence: 72%

Interaction of energetic oxygen ions with the beryllium tungsten alloy Be₂W

et al. 2011

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In this study the interaction of energetic oxygen ions with the beryllium-tungsten alloy Be 2 W is investigated by depth-resolved X-ray photo-electron spectroscopy (XPS). A 4 nm tungsten layer is deposited on polycrystalline beryllium. By alloying at 900 K for 60 min Be 2 W is formed. In successive steps oxygen ions are implanted with 500 and 1000 V acceleration voltage with a fluence of 5 · 10 14 cm -2 in each step. Between the single implantation steps the sample is heated for 30 min at 600 K. Depth-resolved photoelectron spectroscopy is performed after each experimental step. The W 4f and Be 1s spectra reveal formation of beryllium tungstate BeWO 4 already at room temperature (r.t.) in significant amounts due to energy deposition of implanted oxygen ions. No indication for oxygen diffusion at r.t. is observed. In previous experiments in thermal equilibrium the ternary compound has proven to be stable to temperatures up to 1073 K. Contrary to these results, annealing at 600 K already leads to decomposition of BeWO 4 formed by energetic oxygen ions. After decomposition at 600 K oxygen stays in the sample bound as BeO.

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“…The hydrogen consumed in the range ~220 ºC ≤ T ≤ 650 ºC (1.65×10 -3 mol H 2 g -1 ) was only slightly higher than the amount of H 2 calculated for reduction of W 6+ to W 4+ (1.23×10 -3 mol H 2 g -1 ). The main hydrogen consuming process in this temperature range is indeed tungsten reduction [54], as ammonium tungstate species should decompose well below this temperature [60].…”

Section: Optimization Of the Preparation Of The 50ti 07 W 03 O 2 -5mentioning

confidence: 97%

Preparation and characterization of novel Ti0.7W0.3O2–C composite materials for Pt-based anode electrocatalysts with enhanced CO tolerance

Gubán

Borbáth

Pászti

et al. 2015

Applied Catalysis B: Environmental

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Ti-based electroconductive mixed oxides were deposited onto activated carbon by using three different sol-gel-based multistep synthesis routes. As demonstrated by X-ray diffraction, high crystallinity of the tungsten-loaded rutile was achieved by a sequence of annealing in inert atmosphere at 750°C and a short reductive treatment at 650°C.Formation of the rutile phase on the carbon support before the high temperature treatment has been proved to be the prerequisite for complete W incorporation into the rutile lattice. The structural and compositional properties of the mixed oxides were explored by transmission electron microscopy, temperature programmed reduction and X-ray photoelectron spectroscopy. Anode electrocatalysts were formulated by loading the composite of the activated carbon and the Ti-based electroconductive mixed oxides with 40 wt% Pt. Enhanced CO tolerance along with considerable stability was demonstrated for the electrocatalyst prepared using the Ti 0.7 W 0.3 O 2 -C composite material with high degree of W incorporation.

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A new facility for inert transfer of reactive samples to XPS equipment

Cited by 47 publications

References 4 publications

Effect of Substrate Temperature on the Properties of Sprayed WO3 Thin Films Using Peroxotungstic Acid and Ammonium Tungstate: A Comparative Study

Effect of Substrate Temperature on the Properties of Sprayed WO3 Thin Films Using Peroxotungstic Acid and Ammonium Tungstate: A Comparative Study

Interaction of energetic oxygen ions with the beryllium tungsten alloy Be₂W

Preparation and characterization of novel Ti0.7W0.3O2–C composite materials for Pt-based anode electrocatalysts with enhanced CO tolerance

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A new facility for inert transfer of reactive samples to XPS equipment

Cited by 47 publications

References 4 publications

Effect of Substrate Temperature on the Properties of Sprayed WO3 Thin Films Using Peroxotungstic Acid and Ammonium Tungstate: A Comparative Study

Effect of Substrate Temperature on the Properties of Sprayed WO3 Thin Films Using Peroxotungstic Acid and Ammonium Tungstate: A Comparative Study

Interaction of energetic oxygen ions with the beryllium tungsten alloy Be2W

Preparation and characterization of novel Ti0.7W0.3O2–C composite materials for Pt-based anode electrocatalysts with enhanced CO tolerance

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Interaction of energetic oxygen ions with the beryllium tungsten alloy Be₂W