• Water dispersible glycylglycine functionalized gold nanoparticles: application in colorimetric sensing of Hg(II), Pb(II) and Cr(III) in aqueous media

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    • Keywords


      Gold nanoparticles; Glycylglycine; Colorimetric detection; Toxic metal ions.

    • Abstract


      Glycylglycine functionalized water-dispersible gold nanoparticles (AuNPs) were prepared andcharacterized on the basis of ultraviolet and visible spectroscopy (UV-vis), Fourier transform infrared (FTIR),dynamic light scattering (DLS), transmission electron microscope (TEM) and energy dispersive X-ray (EDX)analysis. The AuNPs exhibited a strong SPR band at 522 nm, which after functionalization with glycylglycine,appeared at 525 nm. This SPR band of the functionalized nanoparticles is used as a tool for thedetection of toxic metal ions in water. A large number of metal ions were tested, among which Hg2+, Pb2+,and Cr2+ exhibited distinct colour change, detectable with bare eye, and substantial UV-vis spectral change.TEM images and EDX analysis suggested that the colour change is due to metal-induced aggregation of thefunctionalized nanoparticles due to inter-particle plasmon coupling. The aggregation, which resulted in anincrease in particle size, is further confirmed by DLS measurement. A mechanism of metal-induced aggregationis also proposed. The present study is an example of a simple methodology to prepare water-dispersiblefunctionalized nanoparticle for colorimetric detection of toxic heavy metal ions such as Cr2+, Pb2+,and Hg2+ with high sensitivity.

    • Graphical Abstract


      Synopsis Glycylglycine functionalized water dispersible gold nanoaprticles were prepared, characterized and its metal-ion sensing property was evaluated with the aid of spectroscopic, microscopic and energy dispersive X-ray analysis. These nanoparticles detect Hg2+, Pb2+ and Cr3+ with colour change due to inter particle plasmon coupling because of metal-induced aggregation of the nanoparticles.

    • Author Affiliations



      1. Analytical and Environmental Science Division and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar 364002, India
      2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
      3. Chemistry Division, University of Petroleum and Energy Studies, Bidholi, Dehradun, Uttarakhand 248007, India
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