| Summary: | In this study, we report a cross-linker-based poly(ionic liquid) (PIL) for the sensitive detection of 4-nonylphenol (4-NP). PIL was poly(1,4-butanediyl-3,3′-bis-l-vinylimidazolium dibromide) (poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>)). Poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>) was prepared via one-step free-radical polymerization. The poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>) was characterized by infrared spectroscopy, Raman spectroscopy, thermal gravimetric analyzer and scanning electron microscope. The poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>) was then drop-cast onto a glassy carbon electrode (GCE) to obtain poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>)/GCE. In comparison with a bare GCE, poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>)/GCE exhibited higher peak current responses for [Fe(CN)<sub>6</sub>]<sup>3−/4−</sup>, lower charge transfer resistance, and larger effective surface area. While comparing the peak current responses, we found the peak current response for 4-NP using poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>)/GCE to be 3.6 times higher than a traditional cross-linker ethylene glycol dimethacrylate (EGDMA) based poly(EGDMA) modified GCE. The peak current of poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>) sensor was linear to 4-NP concentration from 0.05 to 5 μM. The detection limit of 4-NP was obtained as 0.01 μM (S/N = 3). The new PIL based electrochemical sensor also exhibited excellent selectivity, stability, and reusability. Furthermore, the poly([V<sub>2</sub>C<sub>4</sub>(mim)<sub>2</sub>]Br<sub>2</sub>)/GCE demonstrated good 4-NP detection in environmental water samples.
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