Carbon Nanotube Formic Acid Sensors Using a Nickel Bis(ortho-Diiminosemiquinonate) Selector
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Swager_Carbon nanotube formic.pdf
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Author(s)
Lin, Sibo
Swager, Timothy M
Date Issued
February 2018
Journal
ACS Sensors
Publisher
American Chemical Society (ACS)
Citation
Lin, Sibo, and Timothy M. Swager. “Carbon Nanotube Formic Acid Sensors Using a Nickel Bis(ortho-Diiminosemiquinonate) Selector.” ACS Sensors 3, 3 (February 2018): 569–573 © 2018 American Chemical Society
Version
Author's final manuscript
Abstract
Formic acid is corrosive, and a sensitive and selective sensor could be useful in industrial, medical, and environmental settings. We present a chemiresistor for detection of formic acid composed of single-walled carbon nanotubes (CNTs) and nickel bis(ortho-diiminosemiquinonate) (1), a planar metal complex that can act as a ditopic hydrogen-bonding selector. Formic acid is detected in concentrations as low as 83 ppb. The resistance of the material decreases on exposure to formic acid, but slightly increases on exposure to acetic acid. We propose that 1 assists in partial protonation of the CNT by formic acid, but the response toward acetic acid is dominated by inter-CNT swelling. This technology establishes CNT-based chemiresistive discrimination between formic and acetic acid vapors.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/ACSSENSORS.8B00026
