Telluriding monolayer MoS2 and WS2 via alkali metal scooter
| Autor: | Dinh Loc Duong, Jiong Zhao, Gang Hee Han, Seok Joon Yun, Seung Mi Lee, Quoc An Vu, Jubok Lee, Bong Gyu Shin, Hyun You Kim, Young Hee Lee |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Science General Physics and Astronomy chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Article General Biochemistry Genetics and Molecular Biology chemistry.chemical_compound Chalcogen Transition metal Monolayer lcsh:Science Molybdenum disulfide Multidisciplinary Thermal decomposition digestive oral and skin physiology technology industry and agriculture General Chemistry 021001 nanoscience & nanotechnology Alkali metal equipment and supplies 0104 chemical sciences chemistry Molybdenum Physical chemistry lcsh:Q 0210 nano-technology Tellurium |
| Zdroj: | Nature Communications, Vol 8, Iss 1, Pp 1-10 (2017) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | The conversion of chalcogen atoms to other types in transition metal dichalcogenides has significant advantages for tuning bandgaps and constructing in-plane heterojunctions; however, difficulty arises from the conversion of sulfur or selenium to tellurium atoms owing to the low decomposition temperature of tellurides. Here, we propose the use of sodium for converting monolayer molybdenum disulfide (MoS2) to molybdenum ditelluride (MoTe2) under Te-rich vapors. Sodium easily anchors tellurium and reduces the exchange barrier energy by scooting the tellurium to replace sulfur. The conversion was initiated at the edges and grain boundaries of MoS2, followed by complete conversion in the entire region. By controlling sodium concentration and reaction temperature of monolayer MoS2, we tailored various phases such as semiconducting 2H-MoTe2, metallic 1T′-MoTe2, and 2H-MoS2−xTex alloys. This concept was further extended to WS2. A high valley polarization of ~37% in circularly polarized photoluminescence was obtained in the monolayer WS2−xTex alloy at room temperature. Two dimensional monolayer transition metal ditellurides and their alloys are interesting but their growth has been difficult. Herein, Yun et al. demonstrate the use of sodium salts to convert transition metal disulfide to ditelluride and alloys in tellurium vapor at low temperature. |
| Databáze: | OpenAIRE |
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