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Sensory Arrays of Covalently Functionalized Single-Walled Carbon Nanotubes for Explosive Detection

Authors

  • Jan M. Schnorr,

    1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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  • Daan van der Zwaag,

    1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
    2. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
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  • Joseph J. Walish,

    1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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  • Yossi Weizmann,

    1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
    2. Department of Chemistry, University of Chicago, Chicago, IL 60637, USA
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  • Timothy M. Swager

    Corresponding author
    1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
    • Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

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Abstract

Chemiresistive sensor arrays for cyclohexanone and nitromethane are fabricated using single-walled carbon nanotubes (SWCNTs) that are covalently functionalized with urea, thiourea, and squaramide containing selector units. Based on initial sensing results and 1H NMR binding studies, the most promising selectors are chosen and further optimized. These optimized selectors are attached to SWCNTs and simultaneously tested in a sensor array. The sensors show a very high level of reproducibility between measurements with the same sensor and across different sensors of the same type. Furthermore, the sensors show promising long-term stability, which renders them suitable for practical applications.

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