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• W3026131380 endingPage "128321" @default.
• W3026131380 startingPage "128321" @default.
• W3026131380 abstract "• A ratiometric nanosensor based on GQDs combined with the oxidase-like activity of Ce 4+ was established for the first time. • Ce 4+ can trigger the oxidation of OPD into oxOPD, which quenches the fluorescence of GQDs through IFE. • This ratiometric fluorescence nanosensor was used to detect Ce 4+ and ALDS with high sensitivity. • This method can detect Ce 4+ and ALDS in real samples with satisfactory recoveries. A simple ratiometric fluorescent sensing system for Ce 4+ and alendronate sodium (ALDS) detection is developed with graphene quantum dots (GQDs) combined with the oxidase-mimicking activity of Ce 4+ . As oxidase-mimicking, Ce 4+ can catalyze the oxidization of o -phenylenediamine (OPD) directly without the requirement of H 2 O 2 . The oxidation product (oxOPD) not only exhibits a strong emission at 562 nm but also quenches the fluorescence of GQDs at 444 nm significantly through inner filter effect (IFE). Due to its strong oxidative ability, Ce 4+ can also oxidize ALDS. Thus, ALDS can inhibit the oxidization of OPD by Ce 4+ . The fluorescence at 444 nm can be protected from quenching while that at 562 nm decreases. Thus, a ratiometric fluorescent strategy for quantitative analysis of Ce 4+ and ALDS has been developed. The ratiometric sensing platform exhibits a high sensitivity with the detection limits of 1.0 μM and 33 nM for Ce 4+ and ALDS, respectively. This strategy can detect Ce 4+ and ALDS in practical samples with satisfactory recoveries." @default.
• W3026131380 created "2020-05-29" @default.
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• W3026131380 date "2020-09-01" @default.
• W3026131380 modified "2023-10-04" @default.
• W3026131380 title "Graphene quantum dots combined with the oxidase-mimicking activity of Ce4+ for ratiometric fluorescent detection of Ce4+ and alendronate sodium" @default.
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• W3026131380 doi "https://doi.org/10.1016/j.snb.2020.128321" @default.
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