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|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.
|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
|Description: ||An article published by RSC Adv., 2015, 5, DOI: 10.1039/c5ra02158h|
|Appears in Collections:||College of Engineering|
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