Journal
ACS SENSORS
Volume 1, Issue 4, Pages 354-357Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.6b00005
Keywords
carbon monoxide; carbon nanotubes; cobalt; chemiresistor; gas sensor
Funding
- National Science Foundation [DMR-1410718]
- Army Research Office through the Institute for Soldier Nanotechnologies
- NSF [1122374]
- F32 Ruth L. Kirschstein National Research Service Award
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1410718] Funding Source: National Science Foundation
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A chemiresistive detector for carbon monoxide was created from single-walled carbon nanotubes (SWCNTs) by noncovalent modification with diiodo(eta(5):eta(1)-1-[2-(N,N-dimethylamino)ethyl]-2,3,4,5-tetramethylcyclopentadienyl)-cobalt(III) ([Cp<^>CoI2]), an organocobalt complex with an intramolecular amino ligand coordinated to the metal center that is displaced upon CO binding. The unbound amino group can subsequently be transduced chemiresistively by the SWCNT network. The resulting device was shown to have a ppm-level limit of detection and unprecedented selectivity for CO gas among CNT-based chemiresistors. This work, the first molecular-level mechanistic elucidation for a CNT-based chemiresistive detector for CO, demonstrates the efficacy of using an analyte's reactivity to produce another chemical moiety that is readily transduced as a strategy for the rational design of chemiresistive CNT-based detectors.
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