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Title
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Development of a New Fluoride Colorimetric Sensor Based on Anti-aggregation of
Modified Silver Nanoparticles
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Type of Research
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Article
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Keywords
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Fluoride ion,Colorimetry, Ag-NPs, Nanosensor, Antiaggregation, Catechol, Sulphanilic acid
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Abstract
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In this study, aggregated silver nanoparticles were prepared using sulphanilic acid and catechol as a collection of stabilizing-reducing
system. Preliminary studies showed that catechol (CAT) is readily oxidized by silver ions followed by sulphanilic acid (SA) nucleophilic
attack. The resulting catechol derivative aggregates silver nanoparticles (Ag-NPs). The resulting product was characterized by different
characterization techniques including UV-Vis spectrometry and transmission electron microscope (TEM). The SA-CAT induced
aggregated Ag-NPs were used to develop a fast and ready to use colorimetric detection method for fluoride ion in water. In the presence of
fluoride ions, the color of aggregated Ag-NPs solution changes from red to yellow with an absorbance decrease at 508 nm and an increase
at 397 nm. Under the optimized conditions, the ratio of the absorbance intensity at 508 nm and 397 nm (A397/A508) was proportional to the
fluoride ion concentration in the range of 1-40 μM with a detection limit of 0.2 μM. The proposed new method was successfully used for
the determination of fluoride concentration in the local spring water samples.
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Researchers
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(First Researcher)، Hossein Abdolmohammad-Zadeh (Second Researcher)، Khalil Farhadi (Third Researcher)
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