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<p>A series of dual-lanthanide metal–organic frameworks (MOFs: Dy<sub>1-x</sub>Ce<sub>x</sub>-BTC) have been successfully prepared by hydrothermal method using dysprosium (Dy<sup>3+</sup>) and cerium (Ce<sup>3+</sup>) ions as metal sources and 1,3,5-benzenetricarboxylic acid (H<sub>3</sub>BTC) as organic ligand, confirmed by XRD patterns and FT-IR spectra, and then the luminescence property, the application in detecting small organic molecules and structural stability have been discussed. Among the samples, Dy<sub>0.8</sub>Ce<sub>0.2</sub>-BTC exhibited two strongest emission peaks located at 485&#xa0;nm and 578&#xa0;nm under the excitation at 295&#xa0;nm, which are attributed to the excited electronic transitions of Dy<sup>3+</sup> from <sup>4</sup>F<sub>9/2</sub> to <sup>6</sup>H<sub>15/2</sub> and <sup>6</sup>H<sub>13/2</sub>. However, Dy<sub>0.8</sub>Ce<sub>0.2</sub>-BTC immersed in the solution of acetaldehyde (AH) demonstrated an obvious luminescence quenching with the calculated quenching constant (<i>K</i><sub><i>sv</i></sub>) and the limit of detection (<i>LOD</i>) as 7.08 × 10<sup>3</sup>&#xa0;M<sup>−1</sup>, 5.36 × 10<sup>–7</sup>&#xa0;M and high selectivity among the other tested organic solvents. Meanwhile, it revealed that the MOF could maintain good microstructural and recycle stability in deionized water, indicating a great potential as a turn-off fluorescent sensor for AH detection. Besides, the luminescence quenching mechanism was deduced from competitive absorption.</p>

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A Turn-Off Fluorescent Sensor (Dy1-xCex-BTC) for Detection of Acetaldehyde with High Sensitivity and Selectivity

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Zitao Yan,
  • Dachuan Zhu

摘要

A series of dual-lanthanide metal–organic frameworks (MOFs: Dy1-xCex-BTC) have been successfully prepared by hydrothermal method using dysprosium (Dy3+) and cerium (Ce3+) ions as metal sources and 1,3,5-benzenetricarboxylic acid (H3BTC) as organic ligand, confirmed by XRD patterns and FT-IR spectra, and then the luminescence property, the application in detecting small organic molecules and structural stability have been discussed. Among the samples, Dy0.8Ce0.2-BTC exhibited two strongest emission peaks located at 485 nm and 578 nm under the excitation at 295 nm, which are attributed to the excited electronic transitions of Dy3+ from 4F9/2 to 6H15/2 and 6H13/2. However, Dy0.8Ce0.2-BTC immersed in the solution of acetaldehyde (AH) demonstrated an obvious luminescence quenching with the calculated quenching constant (Ksv) and the limit of detection (LOD) as 7.08 × 103 M−1, 5.36 × 10–7 M and high selectivity among the other tested organic solvents. Meanwhile, it revealed that the MOF could maintain good microstructural and recycle stability in deionized water, indicating a great potential as a turn-off fluorescent sensor for AH detection. Besides, the luminescence quenching mechanism was deduced from competitive absorption.