Thermal control of organic semiconductors for trace detection of explosives

Edward B. Ogugu, Ross N. Gillanders, Salam Mohammed, Graham A. Turnbull*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
1 Downloads (Pure)

Abstract

Organic semiconductors can be applied as ultra-sensitive fluorescent sensors for detecting trace vapours of explosives. The detection of explosives is manifest by the fluorescence quenching of the sensors. However, for many organic fluorescent sensors, the fluorescence quenching is irreversible and imposes a limitation in terms of reusability. Here we present a study of the thermal control of thin-film fluorescent sensors made from the commercial fluorescent polymer Super Yellow (SY). Thermal control of the sensor's temperature results in the desorption of the absorbed analytes, nitroaromatic explosives (2,4-DNT and DNB), and a taggant molecule (DMDNB). The amount of photoluminescence (PL) quenching and the desorption temperature of analytes provides a route to discriminate between the analytes, and additonally make the SY sensors reusable.
Original languageEnglish
Pages (from-to)29548-2955
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume25
Issue number43
Early online date31 Oct 2023
DOIs
Publication statusPublished - 21 Nov 2023

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