2,4,6-trinitrophenol (TNP) is environmentally deleterious substance that has been of pressing societal concern. Therefore, developing a convenient and reliable platforms for its fast and efficient detection is of paramount importance from security point of view. Herein, amphiphilic fluorescent carbon dots (CDs) were prepared by a simple solvothermal method . CDs exhibit high selectivity and sensitivity on TNP in the polar and apolar solvent and even natural water samples. Moreover, the simple and portable indicator paper can be prepared conveniently and used for sensing TNP visually with high sensitivity and fast response. Research findings obtained from this study would assist in the development of portable devices for the on-site and real-time detection of environmental hazards.
Porous aromatic framework materials with high stability, sensitivity, and selectivity have great potential to provide new sensors for optoelectronic/fluorescent probe devices. In this work, a luminescent porous aromatic framework material (LNU-23) was synthesized via the palladium-catalyzed Suzuki cross-coupling reaction of tetrabromopyrene and 1,2-bisphenyldiborate pinacol ester. The resulting PAF solid exhibited strong fluorescence emission with a quantum yield of 18.31%, showing excellent light and heat stability. Because the lowest unoccupied molecular orbital (LUMO) of LNU-23 was higher than that of the nitro compounds, there was an energy transfer from the excited LNU-23 to the analyte, leading to the selective fluorescence quenching with a limit of detection (LOD) ≈ 1.47 × 10−5M. After integrating the luminescent PAF powder on the paper by a simple dipping method, the indicator papers revealed a fast fluorescence response to gaseous nitrobenzene within 10 s, which shows great potential in outdoor fluorescence detection of nitro compounds.Keywords:porous aromatic framework;luminescence;nitro compounds;indicator paper;selective detection
Visual and selective detection of 2,4,6-trinitrophenol (TNP) for public and environmental protection is an extremely urgent issue and challenge. Herein, a novel fluorescence polyurethane (FPU) has been successfully synthesized and exploited for selective TNP-detection in coexistence with other commonly competitive nitroaromatic analytes. Excellent recognition ability of FPU toward TNP could reach as low as 0.12 μM and the observed fluorescence responses of FPU are exceptional stable to acid, alkali, and salt. Furthermore, a portable, cost effective, and simple indicator paper depending on FPU for visual detection of TNP is developed. FPU indicator paper exhibits two unique advantages: one is the higher selectivity for TNP detection, the other is realizing the rapid and visual explosives detection. The detection mechanism is described for the synergies in the photoelectron transfer (PET), the fluorescence internal filtration effect (IFE) and the fluorescence energy transfer (FRET). This work provides a novel guidance for the design of fluorescent polymers with portable, cost effective, and visual detection of TNP.
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