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A Sensitive Isoniazid Capped Silver Nanoparticles - Selective Colorimetric Fluorescent Sensor for Hg2+ Ions in Aqueous Medium

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Novel isonicotinic acid hydrazide functionalized silver nanoparticles (INH-AgNPs) were synthesized by wet chemical method and used for the detection of Hg2+ ions in aqueous medium. The INH-AgNPs exhibit good absorbance and emission peaks by sensing Hg2+ ions with visible color changes. The detection of Hg2+ ions was confirmed by FT-IR, EDAX spectra and by the changing morphology of INH-AgNPs, and after addition of Hg2+ was confirmed by SEM and TEM imaging studies. Based on the emission intensity the probe INH-AgNPs exhibit a lowest detection limit (LOD) of Hg2+ to 0.18 nM. The association constant (Ka) of INH-AgNPs + Hg2+ ions is calculated using the Bensei-Hildebrand equation. Also, the probe is successfully utilized for the detection of Hg2+ ions in real water samples obtained from different fields, which showed good results.

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The authors are grateful thanks to UGC, New Delhi (UGC-MRP No. 43-186/2014 (SR)) for the financial assistance through the Major Research Project (MRP).

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Correspondence to Karuppannan Sekar.

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Sakthivel, P., Sekar, K. A Sensitive Isoniazid Capped Silver Nanoparticles - Selective Colorimetric Fluorescent Sensor for Hg2+ Ions in Aqueous Medium. J Fluoresc 30, 91–101 (2020). https://doi.org/10.1007/s10895-019-02473-2

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  • Chemosensor
  • Isonicotinic acid hydrazide
  • Silver nanoparticles
  • Mecury ions