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Molecular-To-Device Integration: A Turn-On Polymeric Receptor for IoT-Enabled Detection of Explosive TKX-50
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DOI：10.1002/admt.71221.png)
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Abstract
En 中文
The rational design of responsive molecular frameworks that convert molecular recognition into measurable optical signals is crucial for advanced sensing technologies. Herein, we report a preorganized 3D conjugated polymeric receptor integrated with a custom-built IoT-enabled photonic platform for the quantitative detection of the advanced explosive TKX-50. The polymeric receptor (2), synthesized from tris(4-aminophenyl)amine (TAPA) and tetraphenylethylene (TPE) motifs, exhibits a selective fluorescence “turn-on” response toward TKX-50. Structural and spectroscopic analyses confirm the formation of a thermally robust imine-linked polymeric framework with spherical morphology. Receptor 2 shows a broad emission band with λmax ∼600 nm (ΦEms = 0.005, Ru(2,2′-bipy)32+ as reference), whereas TKX-50 binding induces a strong emission at ∼ 475 nm (ΦEms = 0.51, Ru(2,2′-bipy)32+ as reference), affording an ultralow detection limit of 29.2 nM. Time-resolved fluorescence and DFT/TD-DFT studies reveal that hydrogen bonding-driven charge transfer and excited-state rigidification suppress nonradiative decay pathways associated with phenyl-ring rotation. This emission response was utilised for photocurrent generation and the development of a portable IoT-integrated fluorometric device. A custom-made LED-photodiode architecture enables rapid, reproducible, and quantitative detection of TKX-50. This work integrates purpose-built polymer design with intelligent optoelectronic engineering, establishing a new paradigm for real-time, field-ready detection of energetic materials.
Keywords:
explosives
fluorescence response
functionalized polymer
IoT device
TKX-50
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