Optical-absorption spectra of inorganic fullerenelike<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">Mo</mml:mi><mml:mo>,</mml:mo></mml:math>W)

Frey, Gitti L.; Elani, S.; Homyonfer, M.; Feldman, Yishay; Tenne, Reshef

doi:10.1103/physrevb.57.6666

Cited by 289 publications

(207 citation statements)

References 24 publications

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“…The shift is however lower than reported for the I F-WS 2 nanostructures (i.e. at 649.1 and 551 nm, respectively) [14,45]. Our spectra thus indicate formation of WS 2 hydrothermally synthesized MoS 2 nanowires [46].…”

Section: Hscontrasting

confidence: 40%

“…It shows two weak absorption bands centered at 646 and 533 nm, which can be assigned to the excitons A and B of WS 2 , respectively. The observed positions of the excitonic bands are shifted to higher wavelength in comparison to the respective excitons at 635.8 and 525.3 nm, reported for the bulk 2H WS 2 system [45]. The shift is however lower than reported for the I F-WS 2 nanostructures (i.e.…”

Section: Hscontrasting

confidence: 37%

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Microwave-assisted synthesis of WS₂nanowires through tetrathiotungstate precursors

Panigrahi¹,

Pathak²

2008

Science and Technology of Advanced Materials

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Tungsten disulfide (WS 2 ) nanowires have been synthesized through a microwave-assisted chemical route that uses tungstic acid, elemental sulfur and monoethanolamine as starting reagents for obtaining a precursor solution of tetrathiotungstate ions. Acidification of the precursor solution yields amorphous precipitates, which lead to the formation of nanowires of WS 2 with thickness of about 5-10 nm when heated at 750• C under argon atmosphere for 1.5 h. Phase and the microstructure of the prepared powders have been investigated through x-ray powder diffraction and high-resolution transmission electron microscopy, respectively. Optical absorption of the WS 2 powders reveals a red shift of the exciton bands compared to bulk WS 2 .

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Section: Hscontrasting

confidence: 40%

Section: Hscontrasting

confidence: 37%

Microwave-assisted synthesis of WS₂nanowires through tetrathiotungstate precursors

Panigrahi¹,

Pathak²

2008

Science and Technology of Advanced Materials

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“…Subsequently, the largescale synthesis of IF-MS 2 (M Mo, W) powder has been reported. [3][4][5] Furthermore, these IF metal dichalcogenides exhibit a variety of sizes and shapes and have been investigated by x-ray powder diffraction (XRD), 3 scanning tunneling microscopy (STM), 6 high resolution transmission electron microscopy (TEM), [3][4][5] optical absorption spectroscopy, 7 and Raman scattering. 8 The XRD analysis revealed that the bulk 2H structure of the unit cell is locally preserved within an IF particle.…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of MS₂ (M = Mo, W) Inorganic Fullerenelike and Nanotube Material Optical Absorption and Resonance Raman Measurements

et al. 1998

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The optical properties of inorganic fullerene-like and nanotube MS 2 (M Mo, W) material are studied through absorption and resonance Raman, and compared to those of the corresponding bulk material. The absorption measurements show that the semiconductivity is preserved. Nevertheless, the positions of the excitons are altered in comparison to the bulk. The Raman spectra of the nanoparticles show a close correspondence to that of the bulk. However, the first-order peaks are broadened and, under resonance conditions, new peaks are observed. The new peaks are assigned to disorder-induced zone edge phonons.

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“…In this respect, new opportunities emerged from recognizing that variations in the composition of some twodimensional layered compounds result in microscopic tubular structures [6][7][8]. In 1999 Millet and coworkers [9] reported the synthesis of Na 2 V 3 O 7 , a material whose structure may be considered as composed by nanotubes oriented along the c-axis of the crystal lattice (space group P31c).…”

mentioning

confidence: 99%

Low-Dimensional SpinS=1/2System at the Quantum Critical Limit:Na2V3

et al. 2003

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A low-dimensional spin S = 1/2 system at the quantum critical limit: Na We report the results of measurements of the dc-susceptibility and the 23 Na-NMR response of Na2V3O7, a recently synthesized, non metallic low dimensional spin system. Our results indicate that upon reducing the temperature to below 100 K, the V 4+ moments are gradually quenched, leaving only one moment out of 9 active. The NMR data reveal a phase transition at very low temperatures. With decreasing applied field H, the critical temperature shifts towards T = 0 K, suggesting that Na2V3O7 may be regarded as an insulator reaching a quantum critical point at H = 0.

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Optical-absorption spectra of inorganic fullerenelikeMS2(M=Mo,W)

Cited by 289 publications

References 24 publications

Microwave-assisted synthesis of WS₂nanowires through tetrathiotungstate precursors

Microwave-assisted synthesis of WS₂nanowires through tetrathiotungstate precursors

Optical Properties of MS₂ (M = Mo, W) Inorganic Fullerenelike and Nanotube Material Optical Absorption and Resonance Raman Measurements

Low-Dimensional SpinS=1/2System at the Quantum Critical Limit:Na2V3

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Optical-absorption spectra of inorganic fullerenelikeMS2(M=Mo,W)

Cited by 289 publications

References 24 publications

Microwave-assisted synthesis of WS2nanowires through tetrathiotungstate precursors

Microwave-assisted synthesis of WS2nanowires through tetrathiotungstate precursors

Optical Properties of MS2 (M = Mo, W) Inorganic Fullerenelike and Nanotube Material Optical Absorption and Resonance Raman Measurements

Low-Dimensional SpinS=1/2System at the Quantum Critical Limit:Na2V3

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Product

Resources

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Microwave-assisted synthesis of WS₂nanowires through tetrathiotungstate precursors

Microwave-assisted synthesis of WS₂nanowires through tetrathiotungstate precursors

Optical Properties of MS₂ (M = Mo, W) Inorganic Fullerenelike and Nanotube Material Optical Absorption and Resonance Raman Measurements