Next Article in Journal
Surface Exposure of PEG and Amines on Biodegradable Nanoparticles as a Strategy to Tune Their Interaction with Protein-Rich Biological Media
Next Article in Special Issue
Interactions of Nanoparticles and Biosystems: Microenvironment of Nanoparticles and Biomolecules in Nanomedicine
Previous Article in Journal
Bacterial Cellulose: Production, Modification and Perspectives in Biomedical Applications
Previous Article in Special Issue
Hydrophilic Silver Nanoparticles Loaded into Niosomes: Physical–Chemical Characterization in View of Biological Applications
Open AccessArticle

Bifunctionalized Silver Nanoparticles as Hg2+ Plasmonic Sensor in Water: Synthesis, Characterizations, and Ecosafety

1
Department of Industrial Engineering and INSTM, University of Rome Tor Vergata, via del Politecnico 1, 00133 Rome, Italy
2
Center for Regenerative Medicine, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy
3
Department of Physical, Earth and Environmental Sciences, University of Siena, Via Mattioli 4, 53100 Siena, Italy
4
Department of Life Sciences, via Mattioli 4, 53100 Siena, Italy
5
Department of Sciences, Roma Tre University of Rome, Via della Vasca Navale 79, 00146 Rome, Italy
6
Surface Analysis Laboratory INFN Roma Tre, via della Vasca Navale 84, 00146 Rome, Italy
7
Elettra-Sincrotrone Trieste S.c.p.A., Strada Statale 14, km 163.5, 34149 Basovizza Trieste, Italy
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1353; https://doi.org/10.3390/nano9101353
Received: 20 August 2019 / Revised: 13 September 2019 / Accepted: 16 September 2019 / Published: 20 September 2019
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 λ max = 400 nm together with Dynamic Light Scattering (DLS) measurements (<2RH> = 8 ± 1 nm) and TEM studies (Ø = 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. View Full-Text
Keywords: silver nanoparticles; Hg2+ sensors; heavy metal sensing; plasmonic sensors; optical sensors; ecosafety silver nanoparticles; Hg2+ sensors; heavy metal sensing; plasmonic sensors; optical sensors; ecosafety
Show Figures

Graphical abstract

MDPI and ACS Style

Prosposito, P.; Burratti, L.; Bellingeri, A.; Protano, G.; Faleri, C.; Corsi, I.; Battocchio, C.; Iucci, G.; Tortora, L.; Secchi, V.; Franchi, S.; Venditti, I. Bifunctionalized Silver Nanoparticles as Hg2+ Plasmonic Sensor in Water: Synthesis, Characterizations, and Ecosafety. Nanomaterials 2019, 9, 1353.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop