In this work, hydrophilic silver nanoparticles (AgNPs), bifunctionalized with citrate (Cit) and L-cysteine (L-cys), were synthesized. The typical local surface plasmon resonance (LSPR) at lambda (max) = 400 nm together with Dynamic Light Scattering (DLS) measurements (<2R(H)> = 8 +/- 1 nm) and TEM studies (empty set = 5 +/- 2 nm) confirmed the system nanodimension and the stability in water. Molecular and electronic structures of AgNPs were investigated by FTIR, SR-XPS, and NEXAFS techniques. We tested the system as plasmonic sensor in water with 16 different metal ions, finding sensitivity to Hg2+ in the range 1-10 ppm. After this first screening, the molecular and electronic structure of the AgNPs-Hg2+ conjugated system was deeply investigated by SR-XPS. Moreover, in view of AgNPs application as sensors in real water systems, environmental safety assessment (ecosafety) was performed by using standardized ecotoxicity bioassay as algal growth inhibition tests (OECD 201, ISO 10253:2006), coupled with determination of Ag+ release from the nanoparticles in fresh and marine aqueous exposure media, by means of ICP-MS. These latest studies confirmed low toxicity and low Ag+ release. Therefore, these ecosafe AgNPs demonstrate a great potential in selective detection of environmental Hg2+, which may attract a great interest for several biological research fields.

Prosposito, P., Burratti, L., Bellingeri, A., Protano, G., Faleri, C., Corsi, I., et al. (2019). Bifunctionalized silver nanoparticles as Hg2+ plasmonic sensor in water: Synthesis, characterizations, and ecosafety. NANOMATERIALS, 9(10), 1353 [10.3390/nano9101353].

Bifunctionalized silver nanoparticles as Hg2+ plasmonic sensor in water: Synthesis, characterizations, and ecosafety

Prosposito P.;
2019

Abstract

In this work, hydrophilic silver nanoparticles (AgNPs), bifunctionalized with citrate (Cit) and L-cysteine (L-cys), were synthesized. The typical local surface plasmon resonance (LSPR) at lambda (max) = 400 nm together with Dynamic Light Scattering (DLS) measurements (<2R(H)> = 8 +/- 1 nm) and TEM studies (empty set = 5 +/- 2 nm) confirmed the system nanodimension and the stability in water. Molecular and electronic structures of AgNPs were investigated by FTIR, SR-XPS, and NEXAFS techniques. We tested the system as plasmonic sensor in water with 16 different metal ions, finding sensitivity to Hg2+ in the range 1-10 ppm. After this first screening, the molecular and electronic structure of the AgNPs-Hg2+ conjugated system was deeply investigated by SR-XPS. Moreover, in view of AgNPs application as sensors in real water systems, environmental safety assessment (ecosafety) was performed by using standardized ecotoxicity bioassay as algal growth inhibition tests (OECD 201, ISO 10253:2006), coupled with determination of Ag+ release from the nanoparticles in fresh and marine aqueous exposure media, by means of ICP-MS. These latest studies confirmed low toxicity and low Ag+ release. Therefore, these ecosafe AgNPs demonstrate a great potential in selective detection of environmental Hg2+, which may attract a great interest for several biological research fields.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03
Settore ING-IND/22
Settore ING-IND/23 - Chimica Fisica Applicata
English
Hg2+ sensors; ecosafety; heavy metal sensing; optical sensors; plasmonic sensors; silver nanoparticles
Prosposito, P., Burratti, L., Bellingeri, A., Protano, G., Faleri, C., Corsi, I., et al. (2019). Bifunctionalized silver nanoparticles as Hg2+ plasmonic sensor in water: Synthesis, characterizations, and ecosafety. NANOMATERIALS, 9(10), 1353 [10.3390/nano9101353].
Prosposito, P; Burratti, L; Bellingeri, A; Protano, G; Faleri, C; Corsi, I; Battocchio, C; Iucci, G; Tortora, L; Secchi, V; Franchi, S; Venditti, I
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/233746
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