Plasmonic Sensor Based on Interaction between Silver Nanoparticles and Ni2+ or Co2+ in Water
Federico Mochi,
Luca Burratti,
Ilaria Fratoddi,
Iole Venditti,
Chiara Battocchio,
Laura Carlini,
Giovanna Iucci,
Mauro Casalboni,
Fabio De Matteis,
Stefano Casciardi,
Silvia Nappini,
Igor Pis,
Paolo Prosposito
Affiliations
Federico Mochi
Department of Industrial Engineering and INSTM, University of Rome, Tor Vergata, via del Politecnico 1, 00133 Rome, Italy
Luca Burratti
Department of Industrial Engineering and INSTM, University of Rome, Tor Vergata, via del Politecnico 1, 00133 Rome, Italy
Ilaria Fratoddi
Department of Chemistry, University of Rome Sapienza, Rome, P.le A. Moro 5, 00187 Rome, Italy
Iole Venditti
Department of Sciences, Roma Tre University of Rome Via della Vasca Navale 79, 00146 Rome, Italy
Chiara Battocchio
Department of Sciences, Roma Tre University of Rome Via della Vasca Navale 79, 00146 Rome, Italy
Laura Carlini
Department of Sciences, Roma Tre University of Rome Via della Vasca Navale 79, 00146 Rome, Italy
Giovanna Iucci
Department of Sciences, Roma Tre University of Rome Via della Vasca Navale 79, 00146 Rome, Italy
Mauro Casalboni
Department of Industrial Engineering and INSTM, University of Rome, Tor Vergata, via del Politecnico 1, 00133 Rome, Italy
Fabio De Matteis
Department of Industrial Engineering and INSTM, University of Rome, Tor Vergata, via del Politecnico 1, 00133 Rome, Italy
Stefano Casciardi
National Institute for Insurance against Accidents at Work (INAIL), Department of Occupational and Environmental Medicine, Epidemiology and Hygiene, 00078 Monte Porzio Catone, Italy
Silvia Nappini
IOM-CNR Laboratorio TASC, SS 14, km 163,5 Basovizza, I-34149 Trieste, Italy
Igor Pis
Elettra-Sincrotrone Trieste S.C.p.A., SS 14, km 163.5 Basovizza, I-34149 Trieste, Italy
Paolo Prosposito
Department of Industrial Engineering and INSTM, University of Rome, Tor Vergata, via del Politecnico 1, 00133 Rome, Italy
Silver nanoparticles capped with 3-mercapto-1propanesulfonic acid sodium salt (AgNPs-3MPS), able to interact with Ni2+ or Co2+, have been prepared to detect these heavy metal ions in water. This system works as an optical sensor and it is based on the change of the intensity and shape of optical absorption peak due to the surface plasmon resonance (SPR) when the AgNPs-3MPS are in presence of metals ions in a water solution. We obtain a specific sensitivity to Ni2+ and Co2+ up to 500 ppb (part per billion). For a concentration of 1 ppm (part per million), the change in the optical absorption is strong enough to produce a colorimetric effect on the solution, easily visible with the naked eye. In addition to the UV-VIS characterizations, morphological and dimensional studies were carried out by transmission electron microscopy (TEM). Moreover, the systems were investigated by means of dynamic light scattering (DLS), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and high-resolution X-ray photoelectron spectroscopy (HR-XPS). On the basis of the results, the mechanism responsible for the AgNPs-3MPS interaction with Ni2+ and Co2+ (in the range of 0.5–2.0 ppm) looks like based on the coordination compounds formation.
