Facile synthesis of amino‐functionalized polyphosphazene microspheres and their application for highly sensitive fluorescence detection of Fe³⁺

Abstract

Amino-functionalized highly crosslinked organic-inorganic hybrid polyphosphazene microspheres were prepared via a one-pot polycondensation method and served as a fluorescent sensor for the detection of Fe 3+ in solution. With the introduction of p-phenylenediamine unites, the polyphosphazene microspheres could be endowed with fluorescent property and abundant active amino groups on the surface. The microspheres were further used as the fluorescent sensor for the detection of Fe 3+ . Fluorescence study showed high sensing sensitivity and selectivity of the microspheres, and the limit of detection was determined as 0.076 μM for Fe 3+ . Active amino groups on the surface could efficiently improve the detection sensitivity of Fe 3+ . Moreover, highly crosslinked organic-inorganic hybrid structure was beneficial to the photostability and thermostability, enabled the microspheres to be possible for constructing practicable sensors. This work is expected to inspire the design of advanced polyphosphazene-based fluorescent sensors for applications in analytical detection.

Role of the Anilinium Ion on the Selective Polymerization of Anilinium 2-Acrylamide-2-methyl-1-propanesulfonate

“…The sensitivity of the polymer is comparable with previous reports; however, its detection range is higher than most of the reported ranges [ 37 , 41 , 42 ]. For example, Chen et al reported that the synthesis of polyphosphazene microspheres has selectivity for Fe 3+ aqueous solutions and a detection limit of 76 × 10 −9 M (0.076 μM) in a range from 0 to 10 μM [ 37 ].…”

“…The sensitivity of the polymer is comparable with previous reports; however, its detection range is higher than most of the reported ranges [37,41,42]. For example, Chen et al reported that the synthesis of polyphosphazene microspheres has selectivity for Fe 3+ aqueous solutions and a detection limit of 76 × 10 −9 M (0.076 μM) in a range from 0 to 10 μM [37]. Additionally, Yang et al reports sensitivity for Fe 3+ in N, N dimethylformamide The sensitivity of the polymer is comparable with previous reports; however, its detection range is higher than most of the reported ranges [37,41,42].…”

“…The fluorescent properties of Poly(Ani-AMPS) were investigated when analyzing the interaction between the aromatic ring (anilinium cations) and chloride salt. It is worth saying that using a fluorescent sensor is a convenient method to analyze metal ions due to their high sensitivity and easy operability [36,37]. To analyze the effect of different metal ions on the fluorescence of the polymer, several aqueous solutions were prepared utilizing chloride salts (Al 3+ , Na + , Mg 2+ , Li + , K 2+ , Cu 2+ , Ca 2+ , Fe 2+ , Fe 3+ , NH 4+ ) as solutes at 1 The fluorescent properties of Poly(Ani-AMPS) were investigated when analyzing the interaction between the aromatic ring (anilinium cations) and chloride salt.…”

“…To analyze the effect of different metal ions on the fluorescence of the polymer, several aqueous solutions were prepared utilizing chloride salts (Al 3+ , Na + , Mg 2+ , Li + , K 2+ , Cu 2+ , Ca 2+ , Fe 2+ , Fe 3+ , NH 4+ ) as solutes at 1 The fluorescent properties of Poly(Ani-AMPS) were investigated when analyzing the interaction between the aromatic ring (anilinium cations) and chloride salt. It is worth saying that using a fluorescent sensor is a convenient method to analyze metal ions due to their high sensitivity and easy operability [36,37]. To analyze the effect of different metal ions on the fluorescence of the polymer, several aqueous solutions were prepared utilizing chloride salts (Al 3+ , Na + , Mg 2+ , Li + , K 2+ , Cu 2+ , Ca 2+ , Fe 2+ , Fe 3+ , NH 4+ ) as solutes at 1 mM concentration.…”

“…For example, Chen et al reported that the synthesis of polyphosphazene microspheres has selectivity for Fe 3+ aqueous solutions and a detection limit of 76 × 10 −9 M (0.076 μM) in a range from 0 to 10 μM [37]. Additionally, Yang et al reports sensitivity for Fe 3+ in N, N dimethylformamide The sensitivity of the polymer is comparable with previous reports; however, its detection range is higher than most of the reported ranges [37,41,42]. For example, Chen et al reported that the synthesis of polyphosphazene microspheres has selectivity for Fe 3+…”