A Simple Method for Synthesis of High-Quality Millimeter-Scale 1T' Transition-Metal Telluride and Near-Field Nanooptical Properties.
basic_science · Level V
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- Record sourced from PubMed, PMID 28833622.
- Also identified by DOI 10.1002/adma.201700704.
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Abstract
The controlled synthesis of MoTe<sub>2</sub> and WTe<sub>2</sub> is crucial for their fundamental research and potential electronic applications. Here, a simplified ambient-pressure chemical vapor deposition (CVD) strategy is developed to synthesize high-quality and large-scale monolayer and few-layer 1T'-phase MoTe<sub>2</sub> (length ≈ 1 mm) and WTe<sub>2</sub> (length ≈ 350 µm) crystals by using ordinary salts (KCl or NaCl) as the growth promoter combining with low-cost (NH<sub>4</sub> )<sub>6</sub> Mo<sub>7</sub> O<sub>24</sub> ·4H<sub>2</sub> O and hydrate (NH<sub>4</sub> )<sub>10</sub> W<sub>12</sub> O<sub>41</sub> ·xH<sub>2</sub> O as the Mo and W sources, respectively. Atomic force microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and transmission electron microscopy confirm the high-quality nature and the atomic structure of the as-grown 1T' MoTe<sub>2</sub> and WTe<sub>2</sub> flakes. Variable-temperature transport measurements exhibit their semimetal properties. Furthermore, near-field nanooptical imaging studies are performed on the 1T' MoTe<sub>2</sub> and WTe<sub>2</sub> flakes for the first time. The sub-wavelength effects of 1T'-phase MoTe<sub>2</sub> (λ<sub>p</sub> ≈ 140 nm) and WTe<sub>2</sub> (λ<sub>p</sub> ≈ 100 nm) are obtained. This approach paves the way for the growth of special transition-metal dichalcogenides materials and boosts the future polaritonic research of 2D telluride compounds.