A Simple Method for Synthesis of High‐Quality Millimeter‐Scale 1T′ Transition‐Metal Telluride and Near‐Field Nanooptical Properties |
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| Authors: | Kun Chen Zefeng Chen Xi Wan Zebo Zheng Fangyan Xie Wenjun Chen Xuchun Gui Huanjun Chen Weiguang Xie Jianbin Xu |
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| Affiliation: | 1. Department of Electronic Engineering and Materials Science and Technology Research Center, The Chinese University of Hong Kong, Hong Kong SAR, P. R. China;2. Engineering Research Center of IoT Technology Applications (Ministry of Education), Department of Electronic Engineering, Jiangnan University, Wuxi, P. R. China;3. State Key Lab of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat‐sen University, Guangzhou, P. R. China;4. Instrumental Analysis and Research Center, Sun Yat‐sen University, Guangzhou, P. R. China;5. State Key Lab of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat‐sen University, Guangzhou, P. R. China;6. Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou, Guangdong, China |
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| Abstract: | 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. |
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| Keywords: | 1T′ MoTe2 1T′ WTe2 APCVD ordinary salt promoters sub‐wavelength effect |
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