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    To investigate the strong electrochemiluminescence (ECL) of ultrathin two dimensional metal-organic frameworks (2D MOFs) is crucial. In this work, we reported the strong ECL behavior of 2D Yb-MOFs, which exhibited thickness-dependent ECL. The thinner the 2D Yb-MOFs, the stronger the ECL signals. The corresponding ECL emission mechanism was investigated in detail, which was ascribed to the thinner 2D Yb-MOF with larger specific surface area, provided more luminophores, better electronic conductivity and superior fluorescence quantum yield, which yielded a higher ECL intensity. Considering the excellent ECL performances above, the ultrathin 2D Yb-MOF-1 was selected as new ECL emitter so that a sensor could be fabricated to realize the "on-off-on" detection of picric acid (PA) and berberine chloride form (BCF). The proposed sensor strategy exhibited a good analytical performance, where the linear range for PA detection was from 0.1 μM to 1 μM with a limit of 81.3 nM, and that for BCF detection from 0.05 μM to 1 μM with a limit of 36.5 nM. This study carves out a novel avenue for exploiting excellent ECL materials. Copyright © 2021 Elsevier B.V. All rights reserved.


    Xiao Yan Wang, Si Yu Xiao, Zhong Wei Jiang, Shu Jun Zhen, Cheng Zhi Huang, Qing Qing Liu, Yuan Fang Li. An ultrathin 2D Yb(III) metal-organic frameworks with strong electrochemiluminescence as a "on-off-on" platform for detection of picric acid and berberine chloride form. Talanta. 2021 Nov 01;234:122625

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    PMID: 34364434

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