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Issue 10, 2018, Issue in Progress
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Room temperature amine sensors enabled by sidewall functionalization of single-walled carbon nanotubes

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Abstract

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-C6F4CO2CH3) and 4-azido-2,3,5,6-tetrafluorobenzoic acid (SWCNT-N-C6F4CO2H) attached every 213 and 109 carbon atoms, respectively. Notably, SWCNT-N-C6F4CO2H was sensitive in terms of the percentage of conductance variation from 5 to 40 ppm of ammonia (NH3) and trimethylamine (TMA) with a two-fold higher variation of conductance compared to p-SWCNTs at 40 ppm. The sensors are highly sensitive to NH3 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 (CH3CN), acetone and chloroform (CHCl3). 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 NH3 and TMA at room temperature.

Graphical abstract: Room temperature amine sensors enabled by sidewall functionalization of single-walled carbon nanotubes

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Publication details

The article was received on 13 Dec 2017, accepted on 29 Jan 2018 and first published on 01 Feb 2018


Article type: Paper
DOI: 10.1039/C7RA13304A
Citation: RSC Adv., 2018,8, 5578-5585
  • Open access: Creative Commons BY license
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    Room temperature amine sensors enabled by sidewall functionalization of single-walled carbon nanotubes

    C. Paoletti, M. He, P. Salvo, B. Melai, N. Calisi, M. Mannini, B. Cortigiani, F. G. Bellagambi, T. M. Swager, F. Di Francesco and A. Pucci, RSC Adv., 2018, 8, 5578
    DOI: 10.1039/C7RA13304A

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