Fabrication and mechanism exploration of a highly-sensitive portable probe towards l-lysine and Fe3+ ions

• Published in: Dyes and pigments 2023-12, Vol.220, p.111715, Article 111715
• Main Authors: Wang, Jiaoying, Tai, Minghui, Yu, Zhikui, Wu, Qi, Wang, Qianwei, Guo, Jinhu, Cheng, Yichong, Jin, Dalai, Wang, Longcheng
• Format: Article
• Language: English
• Subjects: Fe3; Fluorescence sensing; l-lysine; Lanthanide metal-organic frameworks; Smartphone
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2023.111715

Herein, a water-stable Zn-based lanthanide MOF (probe 1) was synthesized by the doping of Tb3+/Eu3+ ions in bio-MOF-1. Based on detailed study on structural properties and luminescence properties, it is found that probe 1 has excellent selectivity for the detection of l-lysine (Lys) and Fe3+ ions. The calculated detection limits (DL) for Lys and Fe3+ ions in aqueous solution are 0.107 μM and 0.159 μM, respectively. A reasonable sensing mechanism is proposed based on detailed characterizations and theoretical calculations. Furthermore, a portable sensing device is fabricated for practical on-site application of probe 1. Combined with smartphone, the achieved RGB luminescence signals may present precise information of Lys/Fe3+ in sample solution, which might be of great importance for practical applications. [Display omitted] •As Multifunctional Ln-MOF luminescent probe, probe 1 illustrates highly selective detection of l-lysine and Fe3+ ions.•A more comprehensive luminescence mechanism of probe 1 towards l-lysine and Fe3+ ions are proposed and verified by systematic characterizations and theoretical calculations.•A portable sensing device based on probe 1 is fabricated for practical on-site applications.•l-lysine and Fe3+ ions in sample solutions can be quantitatively analyzed by RGB luminescence signals.