Controlled photocorrosion of tungsten diselenide:  influence of molecular oxygen

Mahalu, D.; Peisach, M.; Jaegermann, Wolfram; Wold, A.; Tenne, R.

doi:10.1021/j100384a005

Cited by 30 publications

(27 citation statements)

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“…Another factor influencing the reactivity of the nanoparticles is the relatively high humidity during the tribological measurements. The chemical reactivity of metal dichalcogenides towards oxidation is known to be influenced by the presence of water [21]. Therefore, the chemical reactivity of MoS 2 in humid atmosphere is likely to be even higher than that of WS 2 .…”

Section: Resultsmentioning

confidence: 99%

Fullerene-like MoS2 Nanoparticles and Their Tribological Behavior

Rosentsveig

Gorodnev²,

Feuerstein³

et al. 2009

Tribol Lett

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167

109

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Using a new quartz-made reactor, large amounts of fullerene-like (IF) MoS 2 nanoparticles were synthesized by reacting MoO 3 vapor with H 2 S in a reducing atmosphere. The nanoparticles were found to be of high crystalline order; with an average size of 70 nm and consist of more than 30 closed shells. Extensive tribological testing of the nanoparticles in two types of synthetic oils-poly-alpha olefins (PAO)-was carried out and compared to that of bulk (2H platelets) MoS 2 and IF-WS 2 . These tests indicated that under high pressure and relatively low humidity, the IF-MoS 2 exhibited a friction coefficient as low as 0.03 and the smallest wear rate of the measured systems. However, its performance was found to be lower in comparison to IF-WS 2 after 2500 cycles, due probably to its inferior chemical stability. This study indicates that the tribological performance of the IF nanoparticles depends strongly on their crystalline order and size.

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Section: Resultsmentioning

confidence: 99%

Fullerene-like MoS2 Nanoparticles and Their Tribological Behavior

Rosentsveig

Gorodnev²,

Feuerstein³

et al. 2009

Tribol Lett

Self Cite

167

109

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show abstract

“…Previous studies on MoS 2 have concentrated mainly on its use as an extreme pressure additive in lubricating oil and as a lubricant additive in polymeric/metallic composites [17][18][19][20][21]. There has been strong interest in the properties of the MoS 2 composites such as thermal oxidation stability, wear reduction mechanism, rolling contact fatigue and material transfer [22].…”

Section: Discussionmentioning

confidence: 99%

Synthesis and Tribological Performance of Novel Mo x W1−x S2 (0 ≤ x ≤ 1) Inorganic Fullerenes

et al. 2009

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Inorganic fullerene-like (IF) MoS 2 and WS 2 nanoparticles were found to be good friction modifiers and anti-wear additives when dispersed in a lubricant. Their tribological performance seems to be related to the structure, size, and shape of these nanomaterials. The present study describes the tribological properties of a new inorganic fullerene IF-Mo x W 1-x S 2 containing both molybdenum and tungsten disulfide under boundary lubrication. Mo x W 1-x S 2 amorphous inorganic fullerene nanostructures were synthesized by means of MOCVD using an induction furnace setup. The average diameters range from 25 to 45 nm. Upon variation of the amounts of precursors and S, various solid solutions of IF-Mo x W 1-x S 2 were obtained. In addition, a morphological, chemical, and structural analysis of the samples was performed using high resolution scanning electron microscopy (HRSEM), transmission electron microscopy (TEM), and X-ray powder diffraction (XRD). Friction experiments were carried out with a ball-on-flat contact using an environmental tribometer. The results show interesting friction reducing and wear properties of these nanomaterials. The change in the molecule stoichiometry, which led to a variation of particles size but also to a variation of the crystallinity of the particles, affects the tribological performance.

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“…31,[33][34][35] Although in this work edge sites were not created using (photo)electrochemical etching, a pristine, unetched, freshly cleaved crystal exposed to air may possess passivated oxidized edges that do not act as recombination centers. Predominantly sigmoidal responses were observed for line scans shown in demonstrated previously using electron-beam-induced-current microscopy for the interface between WSe 2 /WO 3 at edge sites created by (photo)electrochemical etching WSe 2 samples.…”

Section: Energy and Environmental Science Accepted Manuscriptmentioning

confidence: 99%

A scanning probe investigation of the role of surface motifs in the behavior of p-WSe₂ photocathodes

Velázquez

John

Esposito

et al. 2016

Energy Environ. Sci.

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The spatial variation in the photoelectrochemical performance for the reduction of an aqueous one-electron redox couple, Ru(NH 3 ) 6 3+/2+ , and for the evolution of H 2 (g) from 0.5 M H 2 SO 4 (aq) at the surface of bare and Pt-decorated p-type WSe 2 photocathodes has been investigated in situ using scanning photocurrent microscopy (SPCM). The measurements revealed significant differences in the charge-collection performance (quantified by the values of external quantum yields, Φ ext ) on various macroscopic terraces. Local spectral response measurements indicated a variation in the local electronic structure among the terraces which was consistent with a non-uniform spatial distribution of sub-band-gap states within the crystals. The photoconversion

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Controlled photocorrosion of tungsten diselenide: influence of molecular oxygen

Cited by 30 publications

References 0 publications

Fullerene-like MoS2 Nanoparticles and Their Tribological Behavior

Fullerene-like MoS2 Nanoparticles and Their Tribological Behavior

Synthesis and Tribological Performance of Novel Mo x W1−x S2 (0 ≤ x ≤ 1) Inorganic Fullerenes

A scanning probe investigation of the role of surface motifs in the behavior of p-WSe₂ photocathodes

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Controlled photocorrosion of tungsten diselenide: influence of molecular oxygen

Cited by 30 publications

References 0 publications

Fullerene-like MoS2 Nanoparticles and Their Tribological Behavior

Fullerene-like MoS2 Nanoparticles and Their Tribological Behavior

Synthesis and Tribological Performance of Novel Mo x W1−x S2 (0 ≤ x ≤ 1) Inorganic Fullerenes

A scanning probe investigation of the role of surface motifs in the behavior of p-WSe2 photocathodes

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A scanning probe investigation of the role of surface motifs in the behavior of p-WSe₂ photocathodes