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Publications

Prof. Zonghoon Lee’s Atomic-Scale Electron Microscopy Lab

Publications

Link to Google Scholar


Publications in Nature | Science | their sister journals


Nature, 596, 519-524, 2021 Nature, 582, 511-514, 2020 / Nature Nanotechnology, 15, 289-295, 2020 / Nature Nanotechnology, 15, 59-66, 2020 / Science Advances, 6 (10), eaay4958, 2020 / Nature Electronics, 3, 207-215, 2020 / Nature Communications, 11 (1437), 2020 / Nature Energy, 3, 773-782, 2018 / Nature Communications, 8:1549, 2017 / Nature Communications, 6:8294, 2015 / Nature Communications, 6:7817, 2015 / Nature Communications, 5:3383, 2014




Abstract


 Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) have attracted considerable attention as promising building blocks for a new generation of gas-sensing devices because of their excellent electrical properties, superior response, flexibility, and low-power consumption. Owing to their large surface-to-volume ratio, various 2D TMDCs, such as MoS​2, MoSe​2, WS​2, and WSe​2, have exhibited excellent gas-sensing characteristics. However, exploration toward the enhancement of TMDC gas-sensing performance has not yet been intensively addressed. Here, we synthesized large-area uniform WS​2xSe​2-2x alloys for room-temperature gas sensors. As-synthesized WS​2xSe​2-2x alloys exhibit an elaborative composition control owing to their thermodynamically stable sulfurization process. Further, utilizing uniform WS​2xSe​2-2x alloys over a large area, we demonstrated improved NO​2-sensing performance compared to WSe​2 on the basis of an electronic sensitization mechanism. The WS​0.96Se​1.04 alloy gas sensor exhibits 2.4 times enhanced response for NO​2 exposure. Further, we demonstrated a low-power wearable NO​2-detecting wristband that operates at room temperature. Our results show that the proposed method is a promising strategy to improve 2D TMDC gas sensors and has a potential for applications in advanced gas-sensing devices.

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Prior to Joining UNIST, 2011

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