Highly selective and sensitive chemoresistive humidity sensors based on rGO/MoS2 van der Waals composites

Seo Yun Park, Yeon Hoo Kim, Seon Yong Lee, Woonbae Sohn, Jung Eun Lee, Do Hong Kim, Young Seok Shim, Ki Chang Kwon, Kyoung Soon Choi, Hee Joun Yoo, Jun Min Suh, Museok Ko, Jong Heun Lee, Mi Jung Lee, Soo Young Kim, Min Hyung Lee, Ho Won Jang

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Reduced graphene oxide (rGO) and MoS2, the most representative two-dimensional (2D) materials, are receiving significant attention for the fabrication of sensing devices owing to their high surface area, many abundant sites, and excellent mechanical flexibility. Herein, we demonstrated chemoresistive humidity sensors with fast response, excellent selectivity, and ultrahigh sensitivity based on 2D rGO and 2D MoS2 hybrid composites (RGMSs). The RGMSs were fabricated by simple ultrasonication without the addition of additives and additional heating. Compared to pristine rGO, the RGMS exhibited a 200 times higher response to humidity at room temperature. The significant enhancement in the sensing performance of the composite was attributed to electronic sensitization due to p-n heterojunction formation and porous structures between rGO and MoS2. The synergistic combination of rGO and MoS2 could be applied to construct a flexible humidity sensor. The sensing performance of an RGMS flexible device remains the same before and after bending; this indicates that the use of rGO and MoS2 is a viable new and simple strategy to realize a humidity sensor for use in wearable electronics.

Original languageEnglish
Pages (from-to)5016-5024
Number of pages9
JournalJournal of Materials Chemistry A
Volume6
Issue number12
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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    Park, S. Y., Kim, Y. H., Lee, S. Y., Sohn, W., Lee, J. E., Kim, D. H., Shim, Y. S., Kwon, K. C., Choi, K. S., Yoo, H. J., Suh, J. M., Ko, M., Lee, J. H., Lee, M. J., Kim, S. Y., Lee, M. H., & Jang, H. W. (2018). Highly selective and sensitive chemoresistive humidity sensors based on rGO/MoS2 van der Waals composites. Journal of Materials Chemistry A, 6(12), 5016-5024. https://doi.org/10.1039/c7ta11375g