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Tb(iii)-doped nanosheets as a fluorescent probe for the detection of dipicolinic acid

机译：Tb（III） - 掺杂纳米片作为用于检测二辛酸的荧光探针

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A new fluorescent probe based on terbium( III )-doped nanosheets was designed for detecting low-levels of dipicolinic acid (DPA), a biomarker of bacterial spores. The ability to detect ultra-low concentrations of DPA is therefore of great significance. First, Tb( III )-doped ytterbium hydroxide nanosheets were obtained by mechanical exfoliation from layered rare-earth hydroxide (LRH) materials. The morphology of the as-synthesized nanosheets was studied by transmission electron microscopy and atomic force microscopy. The Tb( III )-doped nanosheets are demonstrated to be highly sensitive to DPA, which remarkably enhances Tb( III ) luminescence intensities at a wavelength of 544 nm. Furthermore, Tb( III ) emission increases linearly with DPA concentration. Selectivity studies were conducted by adding different competing aromatic ligands to the sensing solution; however, their fluorescence responses were observed to be negligibly small in comparison with that of DPA. Our findings provide a basis for the application of Tb( III )-doped nanosheets for accurate, sensitive, and selective monitoring of DPA as a biomarker of anthrax.
机译：基于铽（III）的新荧光探针 - 设计用于检测细菌孢子的生物标志物的低水平的二维含吡啶酸（DPA）。因此，检测超低浓度DPA的能力具有重要意义。首先，通过从层状稀土氢氧化物（LRH）材料的机械剥离来获得Tb（III）掺杂的氢氧化镱纳米片。通过透射电子显微镜和原子力显微镜研究了AS合成纳米片的形态。表明TB（III）掺杂的纳米片对DPA非常敏感，这显着增强了544nm波长下的Tb（III）发光强度。此外，Tb（III）发射随着DPA浓度线性增加。通过向感测溶液添加不同竞争的芳族配体进行选择性研究;然而，与DPA的那种相比，观察到它们的荧光反应可忽略较小。我们的研究结果为纳米片剂的应用提供了一种基础，用于准确，敏感和选择性监测DPA作为炭疽的生物标志物。

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