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Plasmonic Sensor Based on Interaction between Silver Nanoparticles and Ni2+ or Co2+ in Water
Federico Mochi1,2, Luca Burratti3, Ilaria Fratoddi4
1Department of Industrial Engineering and INSTM, University of Rome, Tor Vergata, via del Politecnico 1, 00133 Rome, Italy. federico.mochi@uniroma2.it.
Nanomaterials (Basel, Switzerland)
|July 14, 2018
Summary
Silver nanoparticles capped with 3-mercapto-1propanesulfonic acid sodium salt (AgNPs-3MPS) can detect nickel (Ni2+) and cobalt (Co2+) heavy metal ions in water. This optical sensor system provides a visible color change for detecting these ions.
Area of Science:
- Nanotechnology
- Environmental Science
- Analytical Chemistry
Background:
- Heavy metal contamination of water poses significant environmental and health risks.
- Developing sensitive and rapid detection methods for heavy metals like nickel and cobalt is crucial.
Purpose of the Study:
- To prepare silver nanoparticles capped with 3-mercapto-1propanesulfonic acid sodium salt (AgNPs-3MPS).
- To utilize AgNPs-3MPS as an optical sensor for detecting Ni2+ and Co2+ in aqueous solutions.
- To investigate the interaction mechanism between AgNPs-3MPS and Ni2+/Co2+.
Main Methods:
- Synthesis and characterization of AgNPs-3MPS.
- Optical sensing based on Surface Plasmon Resonance (SPR) spectral changes.
- UV-VIS spectroscopy, Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS), FTIR, XPS, and HR-XPS for characterization and mechanism study.
Main Results:
- AgNPs-3MPS demonstrated specific sensitivity to Ni2+ and Co2+ up to 500 ppb.
- A concentration of 1 ppm of Ni2+ or Co2+ induced a colorimetric effect visible to the naked eye.
- The interaction mechanism involves the formation of coordination compounds between AgNPs-3MPS and the metal ions.
Conclusions:
- AgNPs-3MPS are effective optical sensors for detecting Ni2+ and Co2+ in water.
- The sensor offers a simple, visible detection method with good sensitivity.
- Coordination compound formation is the likely mechanism for metal ion detection.
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