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'Sodium-scooter’ delivers tellurium to MoS2

Date:
January 29, 2018
Source:
Institute for Basic Science
Summary:
Korean food delivery system is renowned to be fast and efficient. Scooters speed through the city to bring orders timely to your doorstep. Researchers have now developed a low-temperature reaction, where a “chemical scooter delivery” can be used as a metaphor. A “sodium-scooter”, namely Na2Te, transports tellurium to molybdenum disulfide (MoS2) and tungsten disulfide (WS2) monolayers. With the help of the scooter, sulfur atoms were replaced with tellurium. The process occurs at 525 °C, about 300 °C lower than previously achievable. This study is expected to facilitate the exploration of new properties in these 2D materials.
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Korean food delivery system is renowned to be fast and efficient. Scooters speed through the city to bring orders timely to your doorstep. Researchers from the Center for Integrated Nanostructure Physics, within the Institute for Basic Science (IBS, South Korea) have developed a low-temperature reaction, where a "chemical scooter delivery" can be used as a metaphor. A "sodium-scooter," namely Na2Te, transports tellurium to molybdenum disulfide (MoS2) and tungsten disulfide (WS2) monolayers. With the help of the scooter, sulfur atoms were replaced with tellurium. The process occurs at 525 °C, about 300 °C lower than previously achievable. This study, published in Nature Communications, is expected to facilitate the exploration of new properties in these 2D materials.

"We call it scooter, because it delivers quickly. MoTe2 molecules decompose to molybdenum and tellurium at high temperatures, but the scooter anchors telluride to MoS2 and acts as a catalyst that lowers the activation temperature of the reaction," explains YUN Seok Joon, the first author of the study.

Using this approach, the research team prepared semiconducting molybdenum ditelluride (2H-MoTe2), metallic 1T'-MoTe2, MoS2−xTex and WS2−xTex alloys. The conversion which began at the edges and grain boundaries of MoS2, was complete. 2H-MoTe2 formed near the edge and is favored at low temperatures, while 1T'-MoTe2 at high temperatures. In this method, the team could produce a diode with 2H-MoTe2 on the edge and 2H-MoS2 on the inner part.

The resulting materials had different bandgap (1.1 eV), and higher degree of valley polarization (~37%) than MoS2.


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Materials provided by Institute for Basic Science. Note: Content may be edited for style and length.


Journal Reference:

  1. Seok Joon Yun, Gang Hee Han, Hyun Kim, Dinh Loc Duong, Bong Gyu Shin, Jiong Zhao, Quoc An Vu, Jubok Lee, Seung Mi Lee, Young Hee Lee. Telluriding monolayer MoS2 and WS2 via alkali metal scooter. Nature Communications, 2017; 8 (1) DOI: 10.1038/s41467-017-02238-0

Cite This Page:

Institute for Basic Science. "'Sodium-scooter’ delivers tellurium to MoS2." ScienceDaily. ScienceDaily, 29 January 2018. <www.sciencedaily.com/releases/2018/01/180129091911.htm>.
Institute for Basic Science. (2018, January 29). 'Sodium-scooter’ delivers tellurium to MoS2. ScienceDaily. Retrieved May 26, 2024 from www.sciencedaily.com/releases/2018/01/180129091911.htm
Institute for Basic Science. "'Sodium-scooter’ delivers tellurium to MoS2." ScienceDaily. www.sciencedaily.com/releases/2018/01/180129091911.htm (accessed May 26, 2024).

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