Effects of Nitrogen Concentration on Microstructure of Tungsten Coatings Synthesized by Plasma Sputtering Method

Vassallo, E.; Angella, Giuliano; Caniello, R.; Deambrosis, Silvia Maria; Inzoli, Fabio; Miorin, Enrico; Pedroni, Matteo

doi:10.1007/s10894-015-9945-0

Cited by 5 publications

(6 citation statements)

References 9 publications

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“…In our growth conditions, the pressure is 2 × 10 3 Pa, which is lower than 1 × 10 5 Pa. As a result, the melting temperature of tungsten is reduced. On the other hand, nitrogen can diffuse in the surface layer of tungsten grains to form the WN x phase in our conditions [50][51][52]. However, WN x (e.g.…”

Section: W Doping and Structural Change Of Moo 3-x Nanomaterials 321 ...mentioning

confidence: 76%

Effects of tungsten doping on structure and photoluminescence of MoO_3–xnanomaterials

Wang

Zhong

Shao

et al. 2020

J. Phys. D: Appl. Phys.

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The challenge in molybdenum oxides intended for integration into electronic, optical, energy conversion, and other devices is tuning of their photoluminescence (PL) properties. Despite some initial studies on possibilities of tuning PL properties, this issue remains unresolved. For this reason, we explored the tailoring of PL properties of molybdenum oxide nanomaterials with a dopant through a robust synthesis by hot filament chemical vapour deposition. Here the MoO3–x nanomaterials are doped with tungsten in a low concentration, and the room temperature PL properties are studied. The obtained results highlight the interaction of Mo5+ defects and oxygen vacancies, which are playing an essential role in the enhancement of green PL emission. Moreover, the used doping method is fast and straightforward and can be used to control the structure as well as the PL properties of molybdenum oxide nanomaterials.

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Section: W Doping and Structural Change Of Moo 3-x Nanomaterials 321 ...mentioning

confidence: 76%

Effects of tungsten doping on structure and photoluminescence of MoO_3–xnanomaterials

Wang

Zhong

Shao

et al. 2020

J. Phys. D: Appl. Phys.

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“…1 , recorded in the same experimental conditions. If no evolution with power density is expected, then as the band intensities of oxide and silicon are both proportional to the number of incoming photons (and thus to the power density of the used laser beam), H 800 /H Si should remain constant.…”

mentioning

confidence: 99%

Post-mortem analysis of tungsten plasma facing components in tokamaks: Raman microscopy measurements on compact, porous oxide and nitride films and nanoparticles

Pardanaud¹,

Dellasega²,

Passoni³

et al. 2020

Nucl. Fusion

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Raman microscopy is one of the methods that could be used for future post-mortem analyses of samples extracted from ITER plasma facing. This study shows that this technique is useful for studying tungsten-based materials containing impurities including oxides and nitrides. Here, we apply pulsed laser deposition and DC argon glow discharges to produce tungsten-containing synthetic films (compact, porous) and nanoparticles and investigate the influence of their morphology on the measured Raman spectra. The amounts of oxygen and/or nitrogen in the films are also investigated. Comparative data are obtained by X-ray Photoelectrons Spectroscopy, Atomic Force Microscopy, Electron Microscopies (Scanning and Transmission), Energy Dispersive X-ray spectroscopy, Time-of-Flight Elastic Recoil Detection Analysis. The power density of the laser beam used to perform Raman microscopy is varied by up to 4 orders of magnitude (0.01-20 mW/μm 2 ) to investigate thermal stability of films and nanoparticles. As a first result, we give evidence that Raman microscopy is sensitive enough to detect surface native oxides. Secondly, more tungsten oxides are detected in porous materials and nanoparticles than in compact films, and the intensities of the Raman band correlate to their oxygen content. Thirdly, thermal stability of these films (i.e. structural and chemical modification under laser heating) is poor when compact films contain a sufficiently large amount of nitrogen. This finding suggests that nitrogen can be substituted by oxygen during Raman laser induced heating occurring in ambient air. Finally, our methodology can be used to rapidly characterize morphology and chemistry of the samples analyzed, and also to create oxides at the micrometer scale.

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“…The carbon skeleton, built networks of sp 2 and sp 3 bonds, and that leads to all above mentioned bands totally hides signatures coming from the other chemical bonds. Indeed, C = C bonds lead to very intense bands due to resonance mechanisms enhancing the Raman cross section.…”

Section: Raman Spectroscopy Of Carbon Materialsmentioning

confidence: 99%

“…% a-C:H sample, derived by ion beam analysis [58] and presented in figure 9. Two peaks are present corresponding to bond breaking of C(sp 3 )-H and C(sp 2 )-H bonds, separated by 200 °C . It also displays thermal desorption spectra of H 2 and CH 4 .…”

Section: Perspectives For H Behavior With Raman In Be and Wo: What We...mentioning

confidence: 99%

“…Its use has been abandoned in 2013 for the ITER tokamak [1] and tokamaks adopting an ITER-Like-Wall configuration [2] because of fuel retention problems extrapolated from existing tokamaks. Tungsten is now chosen due to its good thermomechanical properties (dissipating 10 to 20 MW m −2 in steady state operations) and low affinity for hydrogen (H) isotopes [3][4][5]. Be is used with the aim to trap oxygen (O) impurities by forming oxides [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Raman microscopy to characterize plasma-wall interaction materials: from carbon era to metallic walls

Pardanaud,

Martin,

Roubin

et al. 2023

Mater. Res. Express

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Plasma-wall interaction in magnetic fusion devices is responsible for wall changes and plasma pollution with major safety issues. It is investigated both in situ and ex situ, especially by realizing large scale dedicated poWst-mortem campaigns. Selected parts of the walls are extracted and characterized by several techniques. It is important to extract hydrogen isotopes, oxygen or other element content. This is classically done by ion beam analysis and thermal desorption spectroscopy. Raman microscopy is an alternative and complementary technique. The aim of this work is to demonstrate that Raman microscopy is a very sensitive tool. Moreover, if coupled to other techniques and tested on well-controlled reference samples, Raman microscopy can be used efficiently for characterization of wall samples. Present work reviews long experience gained on carbon-based materials demonstrating how Raman microscopy can be related to structural disorder and hydrogen retention, as it is a direct probe of chemical bonds and atomic structure. In particular, we highlight the fact that Raman microscopy can be used to estimate the hydrogen content and bonds to other elements as well as how it evolves under heating. We also present state-of-the-art Raman analyses of beryllium- and tungsten-based materials, and finally, we draw some perspectives regarding boron-based deposits.

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Effects of Nitrogen Concentration on Microstructure of Tungsten Coatings Synthesized by Plasma Sputtering Method

Cited by 5 publications

References 9 publications

Effects of tungsten doping on structure and photoluminescence of MoO_3–xnanomaterials

Effects of tungsten doping on structure and photoluminescence of MoO_3–xnanomaterials

Post-mortem analysis of tungsten plasma facing components in tokamaks: Raman microscopy measurements on compact, porous oxide and nitride films and nanoparticles

Raman microscopy to characterize plasma-wall interaction materials: from carbon era to metallic walls

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Effects of Nitrogen Concentration on Microstructure of Tungsten Coatings Synthesized by Plasma Sputtering Method

Cited by 5 publications

References 9 publications

Effects of tungsten doping on structure and photoluminescence of MoO3–xnanomaterials

Effects of tungsten doping on structure and photoluminescence of MoO3–xnanomaterials

Post-mortem analysis of tungsten plasma facing components in tokamaks: Raman microscopy measurements on compact, porous oxide and nitride films and nanoparticles

Raman microscopy to characterize plasma-wall interaction materials: from carbon era to metallic walls

Contact Info

Product

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Effects of tungsten doping on structure and photoluminescence of MoO_3–xnanomaterials

Effects of tungsten doping on structure and photoluminescence of MoO_3–xnanomaterials