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Published August 1, 2022 | Supplemental Material
Journal Article Open

Demonstration of a Sensitive and Stable Chemical Gas Sensor Based on Covalently Functionalized MoS₂

Abstract

Chemically exfoliated MoS₂ was covalently functionalized and characterized as a chemically sensitive vapor sensor using changes in dc electrical resistance to detect a variety of volatile organic compounds (VOCs). Regardless of the polarity of the functionality introduced to the surface, sensors derived from functionalized MoS₂ showed high sensitivity for polar and nonpolar VOCs. Additionally, MoS₂ functionalized with trifluoromethyl benzyl bromide exhibited a very high sensitivity to polar and nonpolar organic vapors relative to the electrical resistance response of 2H MoS₂, 1T′ MoS₂, or carbon black/polymer composite chemiresistive vapor sensors. Chemically functionalized MoS₂ sensors retained >70% of their initial responsiveness to test analytes after at least 72 h in air.

Additional Information

© 2022 American Chemical Society. Received: April 26, 2022; Accepted: June 21, 2022; Published: July 13, 2022. This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under award no. DE-FG02-03-ER15483. XPS data and vapor sensor measurements were obtained using the facilities and support of the Molecular Materials Resource Center of the Beckman Institute of the California Institute of Technology. M.C.M. acknowledges Graduate Research Fellowship from the National Science Foundation. M.C.M. also acknowledges the Resnick Sustainability Institute at Caltech for fellowship support. Author Contributions: J.M.E., K.S.L., and E.X.Y. contributed equally to this work. The authors declare no competing financial interest.

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Created:
August 22, 2023
Modified:
October 24, 2023