Recovery Improvement for Large-Area Tungsten Diselenide Gas Sensors

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

Research output: Contribution to journalArticle

20 Citations (Scopus)


Semiconducting two-dimensional transition-metal dichalcogenides are considered promising gas-sensing materials because of their large surface-to-volume ratio, excellent electrical conductivity, and susceptible surfaces. However, enhancement of the recovery performance has not yet been intensively explored. In this study, a large-area uniform WSe2 is synthesized for use in a high-performance semiconductor gas sensor. At room temperature, the WSe2 gas sensor shows a significantly high response (4140%) to NO2 compared to the use of NH3, CO2, and acetone. This paper demonstrates improved recovery of the WSe2 gas sensor's NO2-sensing performance by utilizing external thermal energy. In addition, a novel strategy for improving the recovery of the WSe2 gas sensor is realized by reacting NH3 and adsorbed NO2 on the surface of WSe2: the NO2 molecules are spontaneously desorbed, and the recovery time is dramatically decreased (85 min → 43 s). It is expected that the fast recovery of the WSe2 gas sensor achieved here will be used to develop an environmental monitoring system platform.

Original languageEnglish
Pages (from-to)23910-23917
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number28
Publication statusPublished - 2018 Jul 18

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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