Bio-Inspired Carbon Monoxide Sensors with Voltage-Activated Sensitivity
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Author(s)
He, Xin
Yassine, Omar
Salama, Khaled N.
Zhang, Xi-Xiang
Savagatrup, Suchol
Schroeder, Vera
Lin, Sibo
He, Maggie
Swager, Timothy M
Date Issued
October 2017
Journal
Angewandte Chemie International Edition
Publisher
Wiley Blackwell
Citation
Savagatrup, Suchol et al. “Bio-Inspired Carbon Monoxide Sensors with Voltage-Activated Sensitivity.” Angewandte Chemie International Edition 56, 45 (October 2017): 14066–14070 © 2017 Wiley-VCH Verlag
Version
Author's final manuscript
Abstract
Carbon monoxide (CO) outcompetes oxygen when binding to the iron center of hemeproteins, leading to a reduction in blood oxygen level and acute poisoning. Harvesting the strong specific interaction between CO and the iron porphyrin provides a highly selective and customizable sensor. We report the development of chemiresistive sensors with voltage-activated sensitivity for the detection of CO comprising iron porphyrin and functionalized single-walled carbon nanotubes (F-SWCNTs). Modulation of the gate voltage offers a predicted extra dimension for sensing. Specifically, the sensors show a significant increase in sensitivity toward CO when negative gate voltage is applied. The dosimetric sensors are selective to ppm levels of CO and functional in air. UV/Vis spectroscopy, differential pulse voltammetry, and density functional theory reveal that the in situ reduction of Fe III to Fe II enhances the interaction between the F-SWCNTs and CO. Our results illustrate a new mode of sensors wherein redox active recognition units are voltage-activated to give enhanced and highly specific responses.
MIT Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1002/anie.201707491
