Chromophore-Free photonic multilayer films for the ultra-sensitive colorimetric detection of nerve agent mimics in the vapor phase

Recyclable, chromophore-free, one-dimensional photonic crystal (1D PC) films were used for the sub-ppm-level vapor-phase colorimetric detection of diethyl chlorophosphate (DCP), a nerve agent mimic, with humidity-tunable sensitivity. [Display omitted] •Recyclable, flexible, chromophore-free one-dime...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2020-11, Vol.323, p.128698, Article 128698
Main Authors: Jung, Seo-Hyun, Jung, Yu Jin, Park, Byong Chon, Kong, Hoyoul, Lim, Bogyu, Park, Jong Mok, Lee, Hyung-il
Format: Article
Language:English
Subjects:
1D photonic crystal
Carbazoles
Chromophores
Colorimetry
Humidity
Multilayers
Nerve agent mimic
Photonic crystals
Polyethylene terephthalate
Polymer films
Polyvinyl carbazole
Recycle
Relative humidity
Sensitivity
Substrates
Vapor phases
Visibility
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Summary:Recyclable, chromophore-free, one-dimensional photonic crystal (1D PC) films were used for the sub-ppm-level vapor-phase colorimetric detection of diethyl chlorophosphate (DCP), a nerve agent mimic, with humidity-tunable sensitivity. [Display omitted] •Recyclable, flexible, chromophore-free one-dimensional photonic crystal (1D PC) film was fabricated.•1D PC showed colorimetric detection toward a nerve agent mimic.•1D PC showed remarkable selectivity and reversibility.•1D PC showed excellent stability and sustainability. Recyclable, chromophore-free, one-dimensional photonic crystal (1D PC) films were used for the sub-ppm-level vapor phase colorimetric detection of diethyl chlorophosphate (DCP), a nerve agent mimic, with humidity-tunable sensitivity. 1D PC films were fabricated via the sequential alternating-layer deposition of photocrosslinkable poly(N-vinyl carbazole-co-benzophenone acrylate) [P(VC-co-BPA)] as a high-refractive-index (RI) polymer and poly(4-vinylpyridine-co-benzophenone acrylate) [P(4VP-co-BPA)] as a low RI polymer onto a black polyethylene terephthalate (PET) substrate. Distinct colorimetric detection with sub-ppm sensitivity was achieved within a few seconds when these films were exposed to DCP vapor. Furthermore, detection sensitivity and visibility increased with rise in relative humidity (RH), which indicated that detection sensitivity could be fine-tuned through the modulation of RH. This detection process was reversible and repeatable over three cycles, which indicated that these polymeric multilayer films could be recycled while maintaining excellent stability and sustainability.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2020.128698