2D-BMO fluorescent nanosheets were synthesized using a solvothermal method followed by probe sonication. These nanosheets were then employed as fluorescent probes for detecting nitroaromatic compounds picric acid (PA) and 2,4-dinitrophenylhydrazine (2,4-DNPH), which have recently garnered significant attention due to their explosive nature and environmental impact. The fluorescent nanoplatform exhibited stable fluorescence emission at a wavelength of 400 nm (λ_em) when excited at 340 nm (λ_ex). The fluorescence quenching response towards PA and 2,4-DNPH was assessed within a concentration range of 50 to 2000 nM, showing linear responses within the ranges of 50–1100 nM and 50–1400 nM, respectively. The limits of detection were determined to be 2.21 nM for PA and 2.30 nM for 2,4-DNPH, with corresponding R² values of 0.999 and 0.994. The interaction between the 2D-BMO nanosheets and nitroaromatics was the synergistic combination of the FRET, IFE, and electrostatic interaction, which was studied and explained by UV-visible absorption spectroscopy and zeta potential analysis. This 2D-BMO fluorescent sensor could pave the way for replacing traditional dyes that pose significant harm to the environment in the foreseeable future.

中文翻译：

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二维氧化铋 （2D-BMO） 纳米片的合成及其作为荧光探针在爆炸性硝基芳烃化合物检测中的应用


使用溶剂热方法合成 2D-BMO 荧光纳米片，然后进行探针超声处理。然后，这些纳米片被用作荧光探针，用于检测硝基芳香族化合物苦味酸 （PA） 和 2,4-二硝基苯肼 （2,4-DNPH），这些化合物最近因其爆炸性质和环境影响而受到广泛关注。当荧光纳米平台在 340 nm （λ_ex） 激发时，在 400 nm 波长 （λ_em） 处表现出稳定的荧光发射。在 50 至 2000 nM 的浓度范围内评估对 PA 和 2,4-DNPH 的荧光猝灭响应，分别在 50–1100 nM 和 50–1400 nM 范围内显示线性响应。测定 PA 的检测限为 2.21 nM，2,4-DNPH 的检测限为 2.30 nM，相应的 R² 值为 0.999 和 0.994。2D-BMO 纳米片和硝基芳烃之间的相互作用是 FRET、IFE 和静电相互作用的协同组合，通过紫外-可见吸收光谱和 zeta 电位分析进行研究和解释。这种 2D-BMO 荧光传感器可能为在可预见的未来取代对环境构成重大危害的传统染料铺平道路。