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A novel colorimetric sensor based on the TiO 2 /poly(acrylamide- co -methylene bis acrylamide- co -2-(3-(4-nitro-phenyl)thioureido)ethyl methacrylate) nanocomposite was synthesized via a surface modification strategy; methacryloxypropyltrimethoxysilane was used to provide reactive vinyl groups on the surface of TiO 2 nanoparticles for the successful surface polymerization of Am (acrylamide), MBA (methylenbisacrylamide), and NPhM (2-(3-(4-nitrophenyl)thioureido)ethyl methacrylate) components. The successful preparation of nanocomposites was confirmed using Fourier transform infrared, 1 H NMR, 13 C NMR, scanning electron microscopy, transmission electron microscopy, thermogravimetry analysis, and X-ray diffraction methods, and the sensing ability of the probe toward fluoride ions was investigated using naked-eye detection and UV-vis measurement. The interaction of the prepared polymeric nanocomposite with fluoride ions elicited a significant visible change in color from pale yellow to orange and was further affirmed by a clean interconversion of the two absorption bands at 330 and 485 nm. The selective binding ability of the polymeric nanocomposite towards fluoride over other anions, such as I - , Cl - , Br - , AcO - , H 2 PO 4  - , and H 2 SO 4  - was further explored; the prepared chemosensor could detect fluoride ions in acetonitrile with a detection limit of 3 μM.

Efficient Optical and UV–Vis Chemosensor Based on Chromo Probes–Polymeric Nanocomposite Hybrid for Selective Recognition of Fluoride Ions