Ultrasensitive fluorescence detection of Fe3+ ions using fluorescein isothiocyanate functionalized Ag/SiO2/SiO2 core–shell nanocomposites
| Autor: | Suparna Bhattacharjee, Pratyush Phukan, Pranayee Datta, Himanshu Rajbongshi, Arnab Sarkar |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Fluorophore Nanoparticle Condensed Matter Physics 01 natural sciences Fluorescence Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Ion chemistry.chemical_compound Adsorption chemistry 0103 physical sciences Isothiocyanate Nanorod Electrical and Electronic Engineering Fluorescein isothiocyanate Nuclear chemistry |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 30:5580-5597 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-019-00852-w |
| Popis: | Fluorescein isothiocyanate (FITC) functionalized Ag/SiO2/SiO2 core–shell (CS) nanoparticles (NPs) and nanorods (NRs) are synthesized by chemical method to perform the fluorescence detection of Fe3+ in aqueous medium. The Fe3+ ion sensing is performed on the basis of metal-enhanced fluorescence and subsequent fluorescence quenching of fluorophore (fluorescein isothiocyanate) in aqueous medium. The intensity of fluorescence of FITC is found to get enhanced with increasing the silica shell thickness. The fluorescence intensity of FITC of spherical Ag/SiO2/SiO2 (FITC) CS NPs (AgSiF50) is amplified up to 2.25-folds whereas, in case of Ag/SiO2/SiO2 (FITC) CS NRs (AgSiFNR), the fluorescence intensity of FITC is amplified up to 3.63-folds compared to that of pure FITC. Owing to the amplified fluorescence of FITC, AgSiF50 and AgSiFNR samples are evaluated for detection of Fe3+ in an aqueous medium and the proposed nanoprobes exhibit good sensitivity towards Fe3+ detection because of strong binding affinity of Fe3+ with isothiocyanate group of FITC. The limit of detections for AgSiF50 and AgSiFNR are found to be 19.4 nM and 0.8 nM, respectively. The BET surface areas of AgSiF50 and AgSiFNR are calculated to be 157.64 m2 g−1 and 193.42 m2 g−1, respectively. The higher sensitivity of AgSiFNR compared to AgSiF50 for Fe3+ ion sensing is accredited to the higher adsorption capacity and higher fluorescence of FITC. This Ag/SiO2/SiO2 (FITC) CS NRs probe is a very simple and efficient sensor for Fe3+ ion detection and thus, using this sample, a very simple Arduino based electronic device is fabricated which can give real-time application of the idea. |
| Databáze: | OpenAIRE |
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