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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/10782

Title: A silica nanoparticle supported fluorescence “turnon” fluoride ion sensing system with tunable structure and sensitivity
Authors: Appiah-Ntiamoah, Richard
Jadhav, Arvind H.
Puguan, John. Marc. C.
Momade, Francis W. Y.
Kim, Hern
Issue Date: 2015
Publisher: RSC Advances
Citation: RSC Adv., 2015, 5, DOI: 10.1039/c5ra02158h
Abstract: Amino-silane modified silica nanoparticles (SNP-APTMS and SNP-TMSPEDA) doped with silyl-ether protected fluorescein isothiocyanate (FITC-OSMDBT) were synthesized via a sol–gel method in a simple three-step reaction to give fluoride ion probes SNP-TMSPEDA-FITC-OSMDBT (sensor A) and SNPAPTMS- FITC-OSMDBT (sensor B). The sensors were characterized using FT-IR, EDX, TGA, and fluorescence spectroscopy. It was observed that, at fluoride ion and FITC-OSMDBT mole equivalent titration ratio of x : x, the emission spectra of both sensors were similar when x ¼ 1.0; however, at x ¼ 3.0, 6.0, and 9.0, sensor B displayed 3 fold the emission intensity of sensor A. This phenomenon was attributed to non-radiative emission energy transfer mechanisms, which were controlled by the FITCOSMDBT loading. The steric hindrance difference present on N-[3-(trimethoxysilyl) propyl] ethylenediamine (TMSPEDA) and (3-aminopropyl)trimethoxysilane (APTMS) ensured that different amounts of FITC-OSMDBT were loaded on each sensor. At x ¼ 3.0, 6.0, and 9.0, the emission intensity increased linearly with [F ] in DMSO; thus, from the working curve of sensor A, the fluoride ion detection range of sensor B could be calculated and vice versa. The structure of the sensing system being proposed is simple, sensitive to F , and may prove useful with respect to the development of fluoride anion sensors with structures which can be easily modified to produce sensors with varying detection ranges.
Description: An article published by RSC Adv., 2015, 5, DOI: 10.1039/c5ra02158h
URI: http://hdl.handle.net/123456789/10782
Appears in Collections:College of Engineering

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