Titanium-Doped Molybdenum Disulfide Nanostructures

Hsu, Wen Kuang; Zhu, Yah Qiu; Yao, Nan; Firth, Steven; Clark, Robin J. H.; Kroto, Harold W.; Walton, D. R. M.

doi:10.1002/1616-3028(200102)11:1<69::aid-adfm69>3.0.co;2-d

Cited by 55 publications

(37 citation statements)

References 14 publications

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“…The outer layers at the tip show discontinuity in some regions and there are layer defects and dislocations causing deformation in layer stacking. The defects found by us in the Mo 1Àx W x S 2 nanotubes are similar to those described in WS 2 and MoS 2 nanotubes by Walton, Kroto and coworkers [3,4,9]. The TEM image of the nanotube ðx ¼ 0:06Þ in Fig.…”

Section: Resultssupporting

confidence: 85%

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Mo1−W S2 nanotubes and related structures

Nath

Mukhopadhyay

Rao

2002

Chemical Physics Letters

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Section: Resultssupporting

confidence: 85%

“…Besides developing strategies for synthesizing such novel nanotubes, there have been attempts to substitute Mo and W in MoS 2 and WS 2 nanotubes by other metals. Thus, Ti has been introduced in MoS 2 nanotubes, starting with a Mo-Ti alloy [4]. Nb-doped WS 2 nanotubes have been prepared starting with Nb 2 O 5 covered WO x [5].…”

Section: Introductionmentioning

confidence: 99%

Mo1−W S2 nanotubes and related structures

Nath

Mukhopadhyay

Rao

2002

Chemical Physics Letters

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“… 27 , 36 In most cases, substitutionally doped MoS 2 is synthesized by high-temperature sulfurization (900 °C is not uncommon) of an alloy or a nanolaminate of metallic Mo and the pure dopant. 37 Substitutional doping of TMDs with, for example, Nb, 27 Er, 38 C, 28 Ti, 39 Zn, 15 and Cl, 36 has already been reported using this strategy, resulting in mainly n -type doping, in a few instances,in p -type doping, and inmost cases this approach exhibited limited control over the dopant level.…”

Section: Introductionmentioning

confidence: 99%

Atomic Layer Deposition of Al-Doped MoS₂: Synthesizing a p-type 2D Semiconductor with Tunable Carrier Density

Vandalon

Verheijen

Kessels

et al. 2020

ACS Appl. Nano Mater.

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Extrinsically doped two-dimensional (2D) semiconductors are essential for the fabrication of high-performance nanoelectronics among many other applications. Herein, we present a facile synthesis method for Al-doped MoS 2 via plasma-enhanced atomic layer deposition (ALD), resulting in a particularly sought-after p -type 2D material. Precise and accurate control over the carrier concentration was achieved over a wide range (10 17 up to 10 21 cm –3 ) while retaining good crystallinity, mobility, and stoichiometry. This ALD-based approach also affords excellent control over the doping profile, as demonstrated by a combined transmission electron microscopy and energy-dispersive X-ray spectroscopy study. Sharp transitions in the Al concentration were realized and both doped and undoped materials had the characteristic 2D-layered nature. The fine control over the doping concentration, combined with the conformality and uniformity, and subnanometer thickness control inherent to ALD should ensure compatibility with large-scale fabrication. This makes Al:MoS 2 ALD of interest not only for nanoelectronics but also for photovoltaics and transition-metal dichalcogenide-based catalysts.

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“…Preparation of doped TMDC nanoparticles is not new to the literature. For example, nanostructures of WS 2 and MoS 2 doped with carbon [29], titanium [30], or niobium [31] were reported more than a decade and a half ago. Later, the preparation of rhenium-doped TMDC IFs was reported [32].…”

Section: Introductionmentioning

confidence: 99%

Testing of WS2 Nanoparticles Functionalized by a Humin-Like Shell as Lubricant Additives

et al. 2018

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Nanoparticles of transition metal dichalcogenides (TMDC) have been known to reduce friction and wear when added to oil-type liquid lubricants. Aggregation limits the ability of the nanoparticles to penetrate into the interface between the two rubbing surfaces-an important factor in friction reduction mechanisms. Doping has been successfully used to reduce agglomeration, but it must be done in the production process of the nanoparticles. The use of surface-functionalized nanoparticles is less common than doping. Nonetheless, it has the potential to reduce agglomeration and thereby improve the reduction of friction and wear. In this study, we present the results of preliminary tribological ball-on-flat tests performed with WS 2 nanoparticles functionalized by a humin-like conformal shell, as additives to polyalphaolefin-4 (PAO-4) oil. We tested WS 2 inorganic nanotubes (INTs) and two grades of inorganic fullerene-like nanoparticles (IFs). The shell/coating was found to improve friction reduction for IFs but not for INTs through better dispersion in the oil. The thicker the coating on the IFs, the less agglomerated they were. Coated industrial-grade IFs were found, by far, to be the best additive for friction reduction. We suggest the combination between reduced agglomeration and poor crystallinity as the reason for this result.

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Titanium-Doped Molybdenum Disulfide Nanostructures

Abstract: Ti‐doped MoS2 nanotubes are produced by pyrolyzing a H2S/N2 mixture over an oxidized Ti–Mo alloy powder at elevated temperatures. Partial substitution of Mo by Ti does not significantly alter the 2H–MoS2 lattice.

Cited by 55 publications

References 14 publications

Mo1−W S2 nanotubes and related structures

Mo1−W S2 nanotubes and related structures

Atomic Layer Deposition of Al-Doped MoS₂: Synthesizing a p-type 2D Semiconductor with Tunable Carrier Density

Testing of WS2 Nanoparticles Functionalized by a Humin-Like Shell as Lubricant Additives

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Titanium-Doped Molybdenum Disulfide Nanostructures

Abstract: Ti‐doped MoS2 nanotubes are produced by pyrolyzing a H2S/N2 mixture over an oxidized Ti–Mo alloy powder at elevated temperatures. Partial substitution of Mo by Ti does not significantly alter the 2H–MoS2 lattice.

Cited by 55 publications

References 14 publications

Mo1−W S2 nanotubes and related structures

Mo1−W S2 nanotubes and related structures

Atomic Layer Deposition of Al-Doped MoS2: Synthesizing a p-type 2D Semiconductor with Tunable Carrier Density

Testing of WS2 Nanoparticles Functionalized by a Humin-Like Shell as Lubricant Additives

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Resources

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Atomic Layer Deposition of Al-Doped MoS₂: Synthesizing a p-type 2D Semiconductor with Tunable Carrier Density