Facile one-pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂ O₇ ²

Here, we developed a facile one-pot strategy for the fabrication of fluorescent aminoclay (F-AC) through in situ solvothermal treatment of 3-aminopropyltrimethoxysilane, MgCl₂ , and sodium ascorbate at 180°C for 6 h. The obtained F-AC exhibited blue emission, good water solubility, and satisfactory photostability. It was observed that Cr₂ O₇ ^2- could selectively quench the fluorescence of F-AC through the inner filter effect and static quenching process. As a result, a novel fluorescent F-AC-based nanosensor was constructed with good linearity in the range 0.1-75 μM. The nanosensor was successfully applied in real water samples with satisfactory results. This work not only provides a novel nanosensor for Cr₂ O₇ ^2- , but also highlights the F-AC's promising applications in wider fields due to the versatility and simplicity of the preparation strategy.