Strain-Based Chemiresistive Polymer-Coated Graphene Vapor Sensors
Abstract
Suspended chemiresistive graphene sensors have been fabricated using well-established nanofabrication techniques to generate sensors that are highly sensitive to pyridine and with excellent discrimination between polar and nonpolar analytes. When coated with a polymer surface layer and suspended on 3-D patterned glass electrodes, a hybrid combination of polymer and graphene yields chemiresistive vapor sensors. Expansion and contraction of the polymer layer produces strain on the suspended graphene (Gr). Hence, when organic vapors permeate into the polymer layer, the high gauge factor of the graphene induces substantial electrical resistive changes as folds and creases are induced in the graphene. The hybrid suspended polymer/Gr sensor exhibits substantial responses to polar organic vapors, especially pyridine, while also exhibiting reversibility and increased discrimination between polar and nonpolar analytes compared to previous approaches. This sensor design also allows for potential tunability in the types of polymers used for the reactive surface layer, allowing for use in a variety of potential applications.
Additional Information
© 2022 The Authors. Published by American Chemical Society. Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) Received: January 26, 2022; Accepted: February 28, 2022; Published: March 15, 2022. This work was supported by the Department of Energy (DOE) Basic Energy Sciences, grant DE-FG02-03-ER15483. Fabrication was performed in the Kavli Nanoscience Institute (KNI) at Caltech, and the authors thank the KNI staff for their assistance during fabrication. A.C.T. acknowledges a National Science Foundation Graduate Research Fellowship. Author Contributions. A.C.T. and K.S.L. contributed equally. The authors declare no competing financial interest.Attached Files
Published - acsomega.2c00543.pdf
Supplemental Material - ao2c00543_si_001.pdf
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Additional details
- PMCID
- PMC8973036
- Eprint ID
- 113912
- Resolver ID
- CaltechAUTHORS:20220315-625938000
- Department of Energy (DOE)
- DE-FG02-03-ER15483
- NSF Graduate Research Fellowship
- Created
-
2022-03-16Created from EPrint's datestamp field
- Updated
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2022-04-06Created from EPrint's last_modified field
- Caltech groups
- Kavli Nanoscience Institute