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Laser chemosensor with rapid responsivity and inherent memory based on a polymer of intrinsic microporosity

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Published copy (DOI)

Author(s)

  • Yue Wang
  • Neil B. McKeown
  • Kadhum J. Msayib
  • Graham A. Turnbull
  • Ifor D W Samuel

Department/unit(s)

Publication details

JournalSensors
DatePublished - 1 Mar 2011
Issue number3
Volume11
Number of pages10
Pages (from-to)2478-2487
Original languageEnglish

Abstract

This work explores the use of a polymer of intrinsic microporosity (PIM-1) as the active layer within a laser sensor to detect nitroaromatic-based explosive vapors. We show successful detection of dinitrobenzene (DNB) by monitoring the real-time photoluminescence. We also show that PIM-1 has an inherent memory, so that it accumulates the analyte during exposure. In addition, the optical gain and refractive index of the polymer were studied by amplified spontaneous emission and variable-angle ellipsometry, respectively. A second-order distributed feedback PIM-1 laser sensor was fabricated and found to show an increase in laser threshold of 2.5 times and a reduction of the laser slope efficiency by 4.4 times after a 5-min exposure to the DNB vapor. For pumping at 2 times threshold, the lasing action was stopped within 30 s indicating that PIM-1 has a very fast responsivity and as such has a potential sensing ability for ultra-low-concentration explosives.

    Research areas

  • Chemosensors, Distributed feedback laser, Explosive detection, Organic semiconductor, Polymer of intrinsic microporosity

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