A highly selective and sensitive pyridylazo-2-naphthol-poly(acrylic acid) functionalized electrospun nanofiber fluorescence “turn-off” chemosensory system for Ni2+

摘要: A fluorescent nanofiber probe for the determination of Ni2+ was developed via electrospinning a covalently functionalized pyridylazo-2-naphthol-poly(acrylic acid) polymer. Fluorescent nanofibers with diameters in range 230–800 nm were produced uniformly dispersed fluorophores. The excitation and emission fluorescence at wavelengths 479 557 respectively, thereby exhibiting good Stokes' shift. This that employs quenching solid receptor–fluorophore system exhibited correlation between intensity nickel concentration up to 1.0 μg mL−1 based on Stern–Volmer mechanism. achieved detection limit (3δ/S) 0.07 ng precision, calculated as relative standard deviation (RSD) <4% (n = 8). certified reference material (SEP-3) found be 0.8986 mL−1, which is significantly comparable value 0.8980 mL−1. accuracy determinations, expressed error observed values groundwater ≤0.1%. versatility demonstrated by affording simple, rapid selective presence other competing metal ions direct analysis, without employing any further sample handling steps.