Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 255, Issue -, Pages 210-216Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.08.066
Keywords
Silver nanoparticles; Mercaptobenzoheterocyclic compounds; Hg(II) sensing; Nanoalloy; Binding affinity
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Toxic heavy metal ions, specially Hg(II) pose lethal threat to the environment and human beings. To this end, there is a strong need to establish a simple, inexpensive method for the detection of Hg(II) ions with high selectivity and sensitivity in aqueous medium. Herein, we report an ultra-sensitive colorimetric detection of Hg(II) ions following a simple protocol by synthesizing silver nanoparticles functionalized with mercaptobenzoheterocyclic compounds (viz. mercaptobenzooxazole (MBO), mercaptobenzoimidazole (MBI) and mercaptobenzothiazole (MBT). These nanoparticles are found to show a limit of detection (LOD) of 1.8 ppt (9.2 pM), 9.2 ppt (46 pM) and 18.4 ppt (92 pM) for MBO, MBI and MBT respectively). In addition, the binding affinity trend of the mercaptobenzoheterocyclic ligands seems to be in tune with the observed sensitivity trait of Hg2+ sensing. (C) 2017 Elsevier B.V. All rights reserved.
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