Improved chemical vapor transport growth of transition metal dichalcogenides

Ubaldini, Alberto; Giannini, E.

doi:10.1016/j.jcrysgro.2013.12.070

Cited by 33 publications

(26 citation statements)

References 19 publications

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“…After one week growth time, the quartz tube was quickly pulled out and then quenched into cold water. Consistent with the earlier reports [24], the as-grown single crystals show thin flake-like shapes and gold-shining color, with typical sizes are in the range (3 ∼ 10) × (2 ∼ 3) × (0.02 ∼ 0.08) mm 3 . Ref.…”

Section: Introductionsupporting

confidence: 90%

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Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1T−TaS2

Hou

et al. 2018

Phys. Rev. B

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The electric field dependence of the dielectric properties and the non-linear conductance of 1T-TaS 2 below 50 K has been investigated. A large dielectric constant of about 10 4 is obtained up to 10 7 Hz, which can not be attributed to hopping of the localized carriers alone, the collective excitations of the commensurate charge-density-wave must be another contributor. The dielectric spectra disperse slightly in our measured temperature and frequency range. At a moderate dc bias

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Section: Introductionsupporting

confidence: 90%

“…The 2D-CDW often reveals itself in layered transition-metal dichalcogenides and rareearth tritellurides [13,14,[23][24][25][26]. Researchers began to study the charge transport properties of 2D-CDW systems (1T-TaS 2 ) about forty years ago: Refs.…”

Section: Introductionmentioning

confidence: 99%

Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1T−TaS2

Hou

et al. 2018

Phys. Rev. B

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“…From this point of view, source materials and the mineralizer can be regarded as the most decisive factors in the growth of TMD crystals. Thereafter, the reaction conditions could be optimized case by case, typically in an empirical way, and some representative reactions are summarized in Table 1 …”

Section: Cvt Based Synthesis Of 2d Transition Metal Dichalcogenidesmentioning

confidence: 99%

Chemical Vapor Transport Reactions for Synthesizing Layered Materials and Their 2D Counterparts

Wang

Luo

Lü

et al. 2019

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semimetals (Si and Ge) to transition metal dichalcogenides (TMDs), which can be tuned from semiconductors to superconductors, have been intensively investigated. [8] Despite the recent advances in 2D materials, it is still challenging to obtain 2D materials with desired layers and size in facile and controllable manners.Indeed, continuous research has been carried out on the synthesis of 2D materials. [9] Generally, two synthetic strategies, known as top-down and bottom-up, are applied to obtain 2D materials. In the common top-down strategy, 2D materials are exfoliated from their bulk counterparts. Differently, using the bottom-up strategy, 2D materials with a few thin layers, even an atomically thin layer, can be directly synthesized from small building blocks such as molecules and atoms. [10] In these synthetic strategies for 2D materials, chemical vapor transport (CVT) reaction, an old yet powerful technology, plays an important role because CVT reactions can be used for both topdown and bottom-up syntheses of 2D materials. [11] CVT reactions represent a category of reactions with one common feature: a condensed phase, typically a solid, sublimes in the presence of a gaseous reactant (the mineralizer), and then deposits elsewhere usually in the form of crystals. [12] Notably, CVT is different from chemical vapor deposition (CVD), another chemical vapor-based approach for synthesizing 2D materials. Specifically, the main difference between CVT and CVD lies in the source materials for synthesizing products, where solid reactants are typically used in CVT and gaseous precursors are usually applied in CVD. The difference induces consequent differences in reactor design, operational control, and product features, thus bringing strengths and drawbacks for each approach. Since the discovery of CVT reaction by Bunsen in 1851, comprehensive understanding of CVT reactions in both experimental exploration and theoretical modeling has been established. [13] Furthermore, thousands of CVT reactions have been applied till now, producing a great variety of pure and crystalline solids, including metals, metalloids, intermetallic phases, metal oxides, halides, chalcogen halides, chalcogenides, and pnictides. [13,14] The knowledge about CVT reactions, together with the large number of applicable reactions, can offer opportunities for the controllable synthesis of 2D materials and the exploration of new 2D materials. Unfortunately, for the preparation of 2D materials, in stark contrast to the wide application of CVD, 2D materials, namely thin layers of layered materials, are attracting much attention because of their unique electronic, optical, thermal, and catalytic properties for wide applications. To advance both the fundamental studies and further practical applications, the scalable and controlled synthesis of large-sized 2D materials is desired, while there still lacks ideal approaches. Alternatively, the chemical vapor transport reaction is an old but powerful technique, and is recently adopted for synthesizing 2D material...

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“…To prepare the Ag + -intercalated TaS 2 , single-crystalline 2H-and 4Hb-TaS 2 were grown via chemical vapor transport. 20) Polycrystalline TaS 2 and I 2 (5 mg/cm 3 ) as a transporting agent were added to a closed quartz tube. They were sintered using a temperature gradient from 800 to 900°C for seven days.…”

Section: Proton-driven Ion Introductionmentioning

confidence: 99%

Superconductivity in AgxTaS2 single crystals with stage structure obtained via proton-driven ion introduction

Fujioka

Kubo

Nagao

et al. 2018

J. Ceram. Soc. Japan

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Improved chemical vapor transport growth of transition metal dichalcogenides

Cited by 33 publications

References 19 publications

Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1T−TaS2

Possible origin of nonlinear conductivity and large dielectric constant in the commensurate charge-density-wave phase of 1T−TaS2

Chemical Vapor Transport Reactions for Synthesizing Layered Materials and Their 2D Counterparts

Superconductivity in Ag<i><sub>x</sub></i>TaS<sub>2</sub> single crystals with stage structure obtained via proton-driven ion introduction

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