High-Performance Gas Sensor Using a Large-Area WS2 xSe2-2 x Alloy for Low-Power Operation Wearable Applications

Kyung Yong Ko, Sangyoon Lee, Kyunam Park, Youngjun Kim, Whang Je Woo, Donghyun Kim, Jeong Gyu Song, Jusang Park, Jung Hwa Kim, Zonghoon Lee, Hyungjun Kim

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


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 MoS2, MoSe2, WS2, and WSe2, 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 WS2xSe2-2x alloys for room-temperature gas sensors. As-synthesized WS2xSe2-2x alloys exhibit an elaborative composition control owing to their thermodynamically stable sulfurization process. Further, utilizing uniform WS2xSe2-2x alloys over a large area, we demonstrated improved NO2-sensing performance compared to WSe2 on the basis of an electronic sensitization mechanism. The WS0.96Se1.04 alloy gas sensor exhibits 2.4 times enhanced response for NO2 exposure. Further, we demonstrated a low-power wearable NO2-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.

Original languageEnglish
Pages (from-to)34163-34171
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number40
Publication statusPublished - 2018 Oct 10

Bibliographical note

Funding Information:
This work was supported by the following: the Materials and Components Technology Development Program of MOTIE/ KEIT [10080527, Development of commercialization technology of high sensitive gas sensor based on chalcogenide 2D nanomaterial]; and a grant from the National Research Foundation of Korea (NRF) funded by the Korea government (MSIP) (no. NRF-2014R1A2A1A11052588); Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology(no. 2015R1D1A1A01060064).

Publisher Copyright:
© 2018 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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