Vapor transport crystal growth of the transition metal dichalcogenide compounds Nb1-Ta Se2

Dalrymple, B.J.; Mroczkowski, S.; Prober, D. E.

doi:10.1016/0022-0248(86)90204-6

Cited by 18 publications

(12 citation statements)

References 25 publications

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“…Through TMDs, 3d block metal intercalation of TMDs and composites of these materials are explored extensively worldwide, but the detailed study of ternary compounds of Mo (4d block) and W (5d block) is extremely rare. The H 2 evolution catalysis and superconducting nature of some ternary TMDs in the form of nanotubes and nanosheets are reported by few researchers [16][17][18][19][20][21]. In this paper, we have reported the synthesis of MoW-disulphide ternary compounds with different Mo:W molar ratios in particle form at the nanoscale using solid state reactions and provide a comparative analysis of their morphology and optical properties with that of the as-synthesized MoS 2 and WS 2 nanoparticles (NPs).…”

Section: Introductionmentioning

confidence: 99%

Investigation of structural and luminescence properties of nanocrystalline tungsten-incorporated molybdenum disulphide ternary compounds: an experimental and DFT study

Kalita

Chetia

Chetri³

et al. 2019

Bull Mater Sci

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The present manuscript reports the synthesis of tungsten-incorporated molybdenum disulphide ternary compounds in particle form at the nanoscale using existing solid state reactions, followed by ultrasonication and a density functional theory (DFT) investigation of the compound system. The effect of W in the W-inserted MoS 2 ternary compound system is the subject of current research. A comparative study shows enhanced photoluminescence (PL) at room temperature in the as-synthesized transition metal dichalcogenide (TMD) ternary compound. The compositional and structural characterization studies of the materials are performed using XRD, SEM, EDX, TEM and Raman spectroscopy. We have observed that a combination of W and S leads to better crystallinity than the combination of Mo and S in the compound system. The high band gap (BG) energy also confirms the nanoscale dimension of the material system which may be attributed to the formation of excitonic states from spin splitting and band nesting effects. A theoretical investigation of the effect of W in the MoS 2 system using DFT also reveals that insertion of W leads the system toward a direct BG semiconductor (SC). Multiple BGs of the material in the visible light range as found by UV-Visible (UV-Vis) spectroscopy, suggest applicability of these materials in luminescence devices and photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

Investigation of structural and luminescence properties of nanocrystalline tungsten-incorporated molybdenum disulphide ternary compounds: an experimental and DFT study

Kalita

Chetia

Chetri³

et al. 2019

Bull Mater Sci

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“…The samplegrowth procedures have been described elsewhere. 8 min with typical contact resistance less than 1 ⍀. Large gold ribbons ͓50 m(w)ϫ25 m(t)͔ are used as current leads, and thin gold wires ͑diameter 12.5 m͒ are used as voltage probes ͑spaced Ϸ0.5 mm apart͒.…”

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confidence: 99%

Nature of vortex lattice disordering at the onset of the peak effect

1998

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We report a transport study of the onset of the peak effect in a 2H-NbSe 2 single crystal with very weak pinning. At low driving current, we find that at the onset of the peak effect, where the resistance starts to dip with increasing field, the resistance is hysteretic upon field cycling. The resistance is higher for upward field sweeps than for downward sweeps. The difference between the two has a double-peak feature, indicative of two-stage disordering of a vortex lattice. The resistance hysteresis and the two-stage feature disappear after cold-working the sample. The onset field of the peak effect is found to depend on driving current nonmonotonically, suggesting reentrant driven disorder-order and order-disorder transitions in the peak-effect regime.

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“…The supersaturation condition is needed to facilitate crystal formation after the cooling process. The solution is filtered hot and then cooled slowly to get a large crystal form because if the temperature decreases rapidly, the growth rate of the crystal nucleus is faster than the growth rate of the crystal so that the resulting crystals are small brittle, amorphous [22].…”

Section: Isolation Of Andrographolide From the Leaves Of Andrographis Paniculata Nessmentioning

confidence: 99%

Isolation and Identification of Andrographolide Compounds from the Leaves of Sambiloto Plant (Andrographis paniculata Ness)

Septiani¹,

Hakim²,

Patech³

et al. 2021

Acta.Chim.Asiana

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Sambiloto plant (Andrographis paniculata Ness) is a plant that has been used as medicine from generation to generation. Bioactive compounds in Sambiloto have pharmacological effects such as immunostimulants (increase immunity), antibiotic diuretics (facilitate urine), antipyretics, anti-inflammatory (anti-inflammatory), hepatoprotective, hypotensive, hypoglycemic, antibacterial, anti-inflammatory, respiratory tract, and heart and lung meridians - lungs. The bioactive compound in Sambiloto which is mostly found in the leaves is Andrographolide. In this study, the isolation of Andrographolide from the leaves of the sambiloto plant (Andrographis paniculata Ness) was carried out using purification and crystallization methods aimed at obtaining pure Andrographolide isolates more efficiently and identifying the results of Andrographolide isolates. The results showed that the isolates obtained using the purification and crystallization methods obtained a yield of 0.47%. In the qualitative test of Andrographolide isolates using eluent and acetate: n-hexane (3: 2), the Rf value was 0.38. The results obtained from Andrographolide isolates using infrared spectroscopy (FT-IR) were identical to the literature on Andrographolide. The absorption peaks at the wavenumbers obtained includes 3400,41 cm-1, 1979,68 cm-1, 1959,46 cm-1, 2928,22 cm-1, 1727,56 cm-1, 1646,98 cm-1, and 907,53 cm-1.

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Vapor transport crystal growth of the transition metal dichalcogenide compounds Nb1-Ta Se2

Cited by 18 publications

References 25 publications

Investigation of structural and luminescence properties of nanocrystalline tungsten-incorporated molybdenum disulphide ternary compounds: an experimental and DFT study

Investigation of structural and luminescence properties of nanocrystalline tungsten-incorporated molybdenum disulphide ternary compounds: an experimental and DFT study

Nature of vortex lattice disordering at the onset of the peak effect

Isolation and Identification of Andrographolide Compounds from the Leaves of Sambiloto Plant (Andrographis paniculata Ness)

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