Abstract
A new Hg2+-selective fluorescent sensor which consisted of tripodal ligand connected to three 7-nitrobenzo-2-oxa-1,3-diazolyl (NBD) moieties (TNBD) was successfully synthesized. This sensor exhibited high Hg2+-selectivity over other interfering ions with the detection limit of 12.5 ppb. Furthermore, plasmonic enhancement of the synthesized purple silver nanoparticles (P-AgNPs) was utilized to enhance sensitivity of TNBD. Remarkably, the sensor containing P-AgNPs (TNBD + P-AgNPs) preserved high selectivity toward Hg2+with better detection limit (3.8 ppb) compared to the bare sensor. Moreover, Hg2+ detection in real samples (drinking water) by TNBD + P-AgNPs was accomplished which indicated that the sensor could operate in the presence of aqueous-consisted matrix. Therefore, the developed sensor was practical and could be applied for Hg2+-detection in biological samples.
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