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A facile and rapid approach for detecting low concentration of iron ion(Fe3+) with improved sensitivity was developed on the basis of plasmon enhanced fluorescence and subsequently amplified fluorescence quenching.Au1Ag4@Si O2 nanoparticles were synthesized and dispersed into fluorescein isothiocyanate(FITC) solution. The fluorescence of the FITC solution was improved due to plasmon enhanced fluorescence. However, efficient fluorescence quenching of the FITC/Au1Ag4@Si O2 solution was subsequently achieved when Fe3+, with a concentration ranging from17 n M to 3.4 l M, was added into the FITC/Au1Ag4@Si O2 solution, whereas almost no fluorescence quenching was observed for pure FITC solution under the same condition. FITC/Au1Ag4@Si O2 solution shows a better sensitivity for detecting low concentration of Fe3+compared to pure FITC solution. The quantized limit of detection toward Fe3+was improved from 4.6 l M for pure FITC solution to 20 n M for FITC/Au1Ag4@Si O2 solution.
A facile and rapid approach for detecting low concentration of iron ion (Fe3 +) with improved sensitivity was developed on the basis of plasmon enhanced fluorescence and subsequently amplified fluorescence quenching. Au1Ag4 @ Si O2 nanoparticles were synthesized and dispersed into fluorescein isothiocyanate (FITC) solution. The fluorescence of the FITC solution was improved due to plasmon enhanced fluorescence. However, efficient fluorescence quenching of the FITC / Au1Ag4 @ Si O2 solution was succeeded when when Fe3 +, with a concentration ranging from 17 nM to 3.4 l M, was added into the FITC / Au1Ag4 @ Si O2 solution, almost almost no fluorescence quenching was observed for pure FITC solution under the same conditions. FITC / Au1Ag4 @ Si O2 solution shows a better sensitivity for detecting low concentration of Fe3 + than pure to FITC solution. The quantized limit of detection toward Fe3 + was improved from 4.6 l M for pure FITC solution to 20 n M for FITC / Au1Ag4 @ Si O2 solution.