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Simple optical determination of silver ion in aqueous solutions using benzo crown-ether modified gold nanoparticles |
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| Authors: | Nahid Haghnazari Abdolhamid Alizadeh Changiz Karami Zohreh Hamidi |
| Institution: | 1. Department of Biochemistry, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran 2. Department of Chemistry and Nanoscience & Nanotechnology Research Center (NNRC), Razi University, Kermanshah, 67149, Iran 3. Department of Chemistry, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran 4. Young Researchers Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran |
| Abstract: | We describe a method for the modification of gold nanoparticles (Au-NPs) with benzo-15-crown-5 that led to the development of a colorimetric assay for Ag(I) ion. The brown color of a solution of the modified Au-NPs turns to purple on addition of Ag(I) ion. The ratio of the UV–vis absorption at 600 nm and 525 nm is proportional to the concentration of Ag(I) ions in the range from 20 to 950 nM, and the detection limit is 12.5 nM. Other metal ions do not interfere if present in up to millimolar concentrations. The method enables a rapid determination of Ag(I) in lake and drinking water and is amenable to bare-eye readout. The selective colorimetric detection of Ag+ ion using gold nanoparticles modified with benzo crown ether is reported with a color detection limit ~50 nM by naked-eye. The feasibility and simplicity of this cost-effective sensing system demonstrates great potential for the detection of sliver ion in real samples. |
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