Controlled Doping of MS<sub>2</sub> (M=W, Mo) Nanotubes and Fullerene‐like Nanoparticles

Yadgarov, Lena; Rosentsveig, Rita; Leitus, Gregory; Albu‐Yaron, Ana; Moshkovich, A.; Perfilyev, V.; Vasić, Relja; Frenkel, Anatoly I.; Enyashin, Andrey N.; Seifert, Gotthard; Rapoport, L.; Tenne, Reshef

doi:10.1002/anie.201105324

Cited by 76 publications

(91 citation statements)

References 24 publications

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“…A detailed account of the synthesis of the undoped and doped IF-MoS 2 NP can be found in Refs. [10][11][12], respectively. In brief, small amount of ReO 3 was mixed with MoO 3 powder and annealed at 750°C.…”

Section: Methodsmentioning

confidence: 99%

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

et al. 2011

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The electrostatic effects in tribological systems have been studied in the past, especially with regards to data storage media. Nanoparticles (NP) of WS 2 and MoS 2 with fullerene-like structure (IF) have been studied in the past and showed very good tribological behavior. Being semiconductors, their electrical properties can be controlled by, e.g., substituting the lattice Mo (W) atoms with Re (n-type conductivity) and Nb (p-type conductivity) atoms. In this study doping of IF-MoS 2 , and to a lesser degree IF-WS 2 , NP with small amounts (\ 1 at.%) of rhenium atoms has been studied. For this purpose two new synthetic approaches have been pursued. The doped nanoparticles were characterized by various techniques. In particular, the doping density was determined by ICP-MS technique. The resistivity of the nanoparticles was shown to decrease significantly with increasing doping level. In contrast to the undoped nanoparticles, the doped NP were shown to exhibit reduced agglomeration and produce stable suspensions in PAO-4 and PAO-6 oils. Extensive tribological measurements with these PAO oils formulated with 1 wt % of the doped NP showed friction coefficients as low as 0.01 in mixed lubrication conditions and negligible wear. Microscopy analysis of the tribological surfaces reveal very smooth but discontinuous and dense film of the doped NP on the tribological surfaces. It is proposed that the doped NP are negatively charged at their surface eliciting mutual repulsion, which has a remarkable influence on their rheological properties and their tribological behavior.

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Section: Methodsmentioning

confidence: 99%

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

et al. 2011

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“…39 While the incorporation of Re atoms may also enhance the transition to the 1T phase, because of the new electronic structure of the doped material, 40 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 22 atomic resolution and in the general appearance of the particles), it is to be concluded that the incorporation of Re atoms on substitutional Mo sites does not alter significantly the closed-caged structure. 39 While the incorporation of Re atoms may also enhance the transition to the 1T phase, because of the new electronic structure of the doped material, 40 …”

Section: Understanding Reaction Mechanisms If-mos 2 and Int-wsmentioning

confidence: 99%

Diffraction from Disordered Stacking Sequences in MoS₂ and WS₂ Fullerenes and Nanotubes

et al. 2012

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MoS 2 and WS 2 emerge as important materials due to their layered structure, either as molecular sheets or as onion-like inorganic fullerenes. The prominent anisotropy within the materials requires understanding of the layer stacking sequence in order to understand the difference of physical properties of these structures from the bulk materials. Traditional Rietveld refinement in this regime proves to be inadequate to describe the crystallographic structure of these fullerene particles and nanotubes, since the results contradict the direct evidence by high resolution TEM. Another direct method of structure analysis, known as Debye Function Analysis, is used to determine these special features in the X-ray powder diffraction. It is demonstrated that the experimental diffraction intensities are substantially distorted compared to bulk material and that line shapes and intensities are consistent with a random stacking of trigonal prismatic MS 2 layers rather than a mixture of hexagonal and rhombohedral bulk phase. We compare experimental with simulated data for fullerenes of MoS 2 , platelets and nanotubes of WS 2 and discuss the results in relation to growth mechanisms.

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“…8,9 The prototypical TMD material is MoS 2 , 10,11 which is a semiconductor with an optical band gap of about 2 eV. 12,13 It can be doped n or p type, 14 and shows fairly high carrier mobilities, 2 excellent mechanical characteristics, 15 and intriguing optical properties. 16,17 These properties may find use in logical devices, 2,18 flexible electronics, 15,19 photonics, 20,21 and gas sensing.…”

Section: Introductionmentioning

confidence: 99%

From point to extended defects in two-dimensional MoS2: Evolution of atomic structure under electron irradiation

et al. 2013

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By combining high-resolution transmission electron microscopy experiments and first-principles calculations, we study production, diffusion, and agglomeration of sulfur vacancies in monolayer MoS 2 under electron irradiation. Single vacancies are found to be mobile under the electron beam and tend to agglomerate into lines. Different kinds of such extended defects are identified in the experiments, and their atomic structures and electronic properties are determined with the help of calculations. The orientation of line defects is found to be sensitive to mechanical strain. Our calculations also indicate that the electronic properties of the extended defects can be tuned by filling vacancy lines with other atomic species, thereby suggesting a way for strain and electron-beam-assisted engineering of MoS 2 -based nanostructures.

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Controlled Doping of MS₂ (M=W, Mo) Nanotubes and Fullerene‐like Nanoparticles

Cited by 76 publications

References 24 publications

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

Diffraction from Disordered Stacking Sequences in MoS₂ and WS₂ Fullerenes and Nanotubes

From point to extended defects in two-dimensional MoS2: Evolution of atomic structure under electron irradiation

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Controlled Doping of MS2 (M=W, Mo) Nanotubes and Fullerene‐like Nanoparticles

Cited by 76 publications

References 24 publications

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

Diffraction from Disordered Stacking Sequences in MoS2 and WS2 Fullerenes and Nanotubes

From point to extended defects in two-dimensional MoS2: Evolution of atomic structure under electron irradiation

Contact Info

Product

Resources

About

Controlled Doping of MS₂ (M=W, Mo) Nanotubes and Fullerene‐like Nanoparticles

Diffraction from Disordered Stacking Sequences in MoS₂ and WS₂ Fullerenes and Nanotubes