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Robust Cyclohexanone Selective Chemiresistors Based on Single-Walled Carbon Nanotubes

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Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
*Phone: 617-253-4423. E-mail: [email protected]
Cite this: Anal. Chem. 2013, 85, 15, 7154–7158
Publication Date (Web):July 25, 2013
Copyright © 2013 American Chemical Society

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    Functionalized single-walled carbon nanotube (SWCNT)-based chemiresistors are reported for a highly robust and sensitive gas sensor to selectively detect cyclohexanone, a target analyte for explosive detection. The trifunctional selector has three important properties: it noncovalently functionalizes SWCNTs with cofacial π–π interactions, it binds to cyclohexanone via hydrogen bond (mechanistic studies were investigated), and it improves the overall robustness of SWCNT-based chemiresistors (e.g., humidity and heat). Our sensors produced reversible and reproducible responses in less than 30 s to 10 ppm of cyclohexanone and displayed an average theoretical limit of detection (LOD) of 5 ppm.

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