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

Evans, Jake M. and Lee, Kyra S. and Yan, Ellen X. and Thompson, Annelise C. and Morla, Maureen B. and Meier, Madeline C. and Ifkovits, Zachary P. and Carim, Azhar I. and Lewis, Nathan S. (2022) Demonstration of a Sensitive and Stable Chemical Gas Sensor Based on Covalently Functionalized MoS₂. ACS Materials Letters, 4 (8). pp. 1475-1480. ISSN 2639-4979. doi:10.1021/acsmaterialslett.2c00372.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Evans, Jake M.0000-0002-8721-5316
Yan, Ellen X.0000-0003-3252-790X
Thompson, Annelise C.0000-0003-2414-7050
Morla, Maureen B.0000-0002-2520-9543
Meier, Madeline C.0000-0003-1608-0810
Ifkovits, Zachary P.0000-0003-2538-0794
Carim, Azhar I.0000-0003-3630-6872
Lewis, Nathan S.0000-0001-5245-0538
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.
Group:Resnick Sustainability Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-03-ER15483
NSF Graduate Research FellowshipUNSPECIFIED
Resnick Sustainability InstituteUNSPECIFIED
Subject Keywords:Electron density, Functional groups, Functionalization, Sensors, Volatile organic compounds
Issue or Number:8
Record Number:CaltechAUTHORS:20220714-369435000
Persistent URL:
Official Citation:Demonstration of a Sensitive and Stable Chemical Gas Sensor Based on Covalently Functionalized MoS2. Jake M. Evans, Kyra S. Lee, Ellen X. Yan, Annelise C. Thompson, Maureen B. Morla, Madeline C. Meier, Zachary P. Ifkovits, Azhar I. Carim, and Nathan S. Lewis. ACS Materials Letters 2022 4 (8), 1475-1480; DOI: 10.1021/acsmaterialslett.2c00372
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115555
Deposited By: George Porter
Deposited On:14 Jul 2022 23:13
Last Modified:15 Aug 2022 22:18

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