研究目的
Designing a hybrid dye-MOF structure for optical recognition of picric acid (PA) to address the need for simple, sensitive, and selective detection methods for explosives and environmental monitoring.
研究成果
The hybrid structure R6h@EuBTC successfully provides two sensing channels (colorimetric and ratiometric fluorescent) for PA detection with good linearity, selectivity, and low LOD (3.9 μM). The sensing mechanism involves proton-induced emission turn-on for rhodamine and electron transfer-induced emission turn-off for Eu components. The novelty lies in dual sensing capabilities and practicality for naked-eye detection, with recommendations for future enhancements in sensitivity and range.
研究不足
The working range for sensing is limited to PA concentrations up to 140 μM, beyond which sensing capacity is exhausted. The sensitivity for ratiometric fluorescent sensing is lower than for colorimetric sensing, and further improvements in sensitivity and widened working range are needed.
1：Experimental Design and Method Selection:
The study involved synthesizing a hybrid dye-MOF structure (R6h@EuBTC) by combining a rare earth metal-organic framework (EuBTC) with a rhodamine-based dye (R6h) for optical sensing of picric acid (PA). Characterization methods included XRD, IR spectroscopy, thermal gravimetric analysis (TGA), and photophysical analysis (absorption, emission, excitation spectra).
2：Sample Selection and Data Sources:
Samples included synthesized EuBTC nanocrystals, R6h dye, and the hybrid R6h@EuBTC. PA solutions of varying concentrations (0-140 μM) were prepared in ethanol for testing.
3：List of Experimental Equipment and Materials:
Equipment included SEM for morphology, XRD for crystal structure, IR spectrometer, TGA analyzer, and spectrophotometers for optical measurements. Materials included Eu(NO3)3, NaAc, H3BTC, ethanol, DMF, EDC, NHS, rhodamine 6G, hydrazine, and PA.
4：Experimental Procedures and Operational Workflow:
Synthesis involved ultrasonic treatment and reflux methods. Optical sensing tests involved adding PA to R6h@EuBTC suspensions and measuring absorption and emission spectra. Response time and selectivity were tested with various interferents.
5：Data Analysis Methods:
Data were analyzed using linear fitting for calibration curves, limit of detection (LOD) calculation (3σ/S method), and emission lifetime measurements for mechanism confirmation.
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