Room temperature amine sensors enabled by sidewall functionalization of single-walled carbon nanotubes
Author(s)
Paoletti, Clara; He, Maggie; Salvo, Pietro; Melai, Bernando; Calisi, Nicola; Mannini, Matteo; Cortigiani, Brunetto; Bellagambi, Francesca G.; Swager, Timothy M.; Di Francesco, Fabio; Pucci, Andrea; ... Show more Show less![Thumbnail](/bitstream/handle/1721.1/124867/c7ra13304a.pdf.jpg?sequence=4&isAllowed=y)
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A new series of sidewall modified single-walled carbon nanotubes (SWCNTs) with perfluorophenyl molecules bearing carboxylic acid or methyl ester moieties are herein reported. Pristine and functionalized SWCNTs (p-SWCNTs and f-SWCNTs, respectively) were characterized by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and scanning electron microscopy (SEM). The nitrene-based functionalization provided intact SWCNTs with methyl 4-azido-2,3,5,6-tetrafluorobenzoate (SWCNT-N-C[subscript 6]F[subscript 4]CO[subscript 2]CH[subscript 3]) and 4-azido-2,3,5,6-tetrafluorobenzoic acid (SWCNT-N-C[subscript 6]F[subscript 4]CO[subscript 2]H) attached every 213 and 109 carbon atoms, respectively. Notably, SWCNT-N-C[subscript 6]F[subscript 4]CO[subscript 2]H was sensitive in terms of the percentage of conductance variation from 5 to 40 ppm of ammonia (NH[subscript 3]) and trimethylamine (TMA) with a two-fold higher variation of conductance compared to p-SWCNTs at 40 ppm. The sensors are highly sensitive to NH[subscript 3] and TMA as they showed very low responses (0.1%) toward 200 ppm of volatile organic compounds (VOCs) containing various functional groups representative of different classes of analytes such as benzene, tetrahydrofurane (THF), hexane, ethyl acetate (AcOEt), ethanol, acetonitrile (CH[subscript 3]CN), acetone and chloroform (CHCl[subscript 3]). Our system is a promising candidate for the realization of single-use chemiresistive sensors for the detection of threshold crossing by low concentrations of gaseous NH[subscript 3] and TMA at room temperature.
Date issued
2018-02Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of ChemistryJournal
RSC Advances
Publisher
Royal Society of Chemistry (RSC)
Citation
Paoletti, Clara, et al. “Room Temperature Amine Sensors Enabled by Sidewall Functionalization of Single-Walled Carbon Nanotubes.” RSC Advances 8, 10 (2018): 5578–85. © 2018 The Royal Society of Chemistry
Version: Final published version
ISSN
2046-2069