3 years ago

A Simple Method for Synthesis of High-Quality Millimeter-Scale 1T′ Transition-Metal Telluride and Near-Field Nanooptical Properties

A Simple Method for Synthesis of High-Quality Millimeter-Scale 1T′ Transition-Metal Telluride and Near-Field Nanooptical Properties
Jianbin Xu, Xi Wan, Fangyan Xie, Huanjun Chen, Xuchun Gui, Weiguang Xie, Zefeng Chen, Kun Chen, Zebo Zheng, Wenjun Chen
The controlled synthesis of MoTe2 and WTe2 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 MoTe2 (length ≈ 1 mm) and WTe2 (length ≈ 350 µm) crystals by using ordinary salts (KCl or NaCl) as the growth promoter combining with low-cost (NH4)6Mo7O24·4H2O and hydrate (NH4)10W12O41·xH2O 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′ MoTe2 and WTe2 flakes. Variable-temperature transport measurements exhibit their semimetal properties. Furthermore, near-field nanooptical imaging studies are performed on the 1T′ MoTe2 and WTe2 flakes for the first time. The sub-wavelength effects of 1T′-phase MoTe2 (λp ≈ 140 nm) and WTe2 (λp ≈ 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. High-quality and millimeter-scale two-dimensional (2D) 1T′-phase MoTe2 and WTe2 crystals are synthesized through a simplified chemical vapor deposition (CVD) strategy by using green and ordinary salt as a promoter. Near-field nanooptical studies are performed on the as-grown 1T′ transition-metal tellurides for the first time. The sub-wavelength effects of 1T′-phase MoTe2 (λp ≈ 140 nm) and WTe2 (λp ≈ 100 nm) are obtained.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201700704

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.