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Fluorescence Sensing of Amine Vapors Using a Cationic Conjugated Polymer Combined with Various Anions

Authors

  • Dr. Sébastien Rochat,

    1. Department of Chemistry and The Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (USA)
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  • Prof. Dr. Timothy M. Swager

    Corresponding author
    1. Department of Chemistry and The Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (USA)
    • Department of Chemistry and The Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (USA)

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  • This research was supported by the Army Research Office through MIT’s Institute for Soldier Nanotechnologies. S.R. acknowledges financial support from the Swiss National Science Foundation (Advanced Postdoctoral fellowship PA00P2-145389). We thank J. F. Fennell and Dr. J. Im for help with the XPS analyses.

Abstract

A series of conjugated cationic polymers, differentiated only by their accompanying counter-anions, was prepared and characterized. The choice of counter-anion (CA) was found to drastically impact the solubility of the polymers and their optical properties in solution and in the solid state. Fluorescent polymer thin films were found to be instantaneously quenched by volatile amines in the gas phase at low ppm concentrations, and a mini-array with CAs as variable elements was found to be able to differentiate amines with good fidelity.

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