Hydrophilic silver nanoparticles with tunable optical properties: application for the detection of heavy metals in water

Prosposito, P.; Mochi, Federico; Ciotta, Erica; Casalboni, M.; F, De Matteis; Venditti, Iole; Fontana, Laura; Testa, Giovanna; Fratoddi, Ilaria

doi:10.3762/bjnano.7.157

Cited by 66 publications

(53 citation statements)

References 52 publications

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“…In the past decade, the research on nanomaterials has undergone a huge development in many different fields such as medicine, biology, energy and sensors [1][2][3][4][5][6]. In particular, innovative carbon-based nanomaterials such as graphene quantum dots (GQDs) and graphene oxide quantum dots (GOQDs) have attracted much interest as stable, nontoxic, photoluminescent nanomaterials with possible applications in chemical and biological sensors, drug delivery, bio-imaging and energy conversion [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Ciotta¹,

Paoloni²,

Prosposito³

et al. 2017

Preprint

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A novel type of graphene-like quantum dots, synthesized by oxidation and cage-opening of C60 buckminsterfullerene, has been studied as a fluorescent and absorptive probe for heavy-metal ions.The lattice structure of such unfolded fullerene quantum dots (UFQDs) is distinct from that of graphene since it includes both carbon hexagons and pentagons. The basic optical properties, however, are similar to those of regular graphene oxide quantum dots. On the other hand, UFQDs behave quite differently in the presence of heavy-metal ions, in that multiple sensitivity to Cu 2+ , Pb 2+ and As(III) was observed through comparable quenching of the fluorescent emission and different variations of the transmittance spectrum. By dynamic light scattering measurements we confirmed, for the first time in metal sensing, that this response is due to multiple complexation and subsequent aggregation of UFQDs. Nonetheless, the explanation of the distinct behaviour of transmittance in the presence of As(III) and the formation of precipitate with Pb 2+ require further studies. These differences, however, also make it possible to discriminate between the three metal ions in view of the implementation of a selective multiple sensor.

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Section: Introductionmentioning

confidence: 99%

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Ciotta¹,

Paoloni²,

Prosposito³

et al. 2017

Preprint

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“…It is also possible to introduce different capping agents at the same time: in this way, many superficial functionalities can be introduced, but this approach needs strict control of the synthetic parameters (pH, concentrations, reducing agent, temperature) to assurance good reproducibility and dispersity [107,108]. The monodispersity is a key feature for the noble metal nanoparticles, which can be obtained by fine tuning experimental parameters during synthesis or by separation after synthesis [108][109][110].…”

Section: Aunpsmentioning

confidence: 99%

Gold Nanoparticles and Nanorods in Nuclear Medicine: A Mini Review

et al. 2019

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In the last decade, many innovative nanodrugs have been developed, as well as many nanoradiocompounds that show amazing features in nuclear imaging and/or radiometabolic therapy. Their potential uses offer a wide range of possibilities. It can be possible to develop nondimensional systems of existing radiopharmaceuticals or build engineered systems that combine a nanoparticle with the radiopharmaceutical, a tracer, and a target molecule, and still develop selective nanodetection systems. This review focuses on recent advances regarding the use of gold nanoparticles and nanorods in nuclear medicine. The up-to-date advancements will be shown concerning preparations with special attention on the dimensions and functionalizations that are most used to attain an enhanced performance of gold engineered nanomaterials. Many ideas are offered regarding recent in vitro and in vivo studies. Finally, the recent clinical trials and applications are discussed.Radiopharmaceuticals are showing amazing outcomes in diagnostic (90%) and therapeutic (10%) applications for many diseases such as cancer, heart and brain diseases, and so on [33]. They consist of a radioactive nuclide linked to a biologically active molecule directed to the target of interest. When radionuclides emit γ rays (either directly, as pure γ emitters, or indirectly, as β+ emitters), the radiopharmaceutical is intended for diagnostic imaging. When radionuclides emit β− or α particles (thanks to the cell-damaging properties) the radiopharmaceutical is used for therapeutic applications and, in some recent research studies, even for radio-guided surgery [34][35][36]. Theragnostics is a new term that implies the use of the same molecule, labeled with different radionuclides, for both diagnostic and therapeutic purposes [37][38][39].Radiopharmaceuticals have been increasingly used for medical diagnosis since the late 1940s, when nuclear medicine was born. Nuclear medicine aims at evaluating both physiological function as well as biochemical changes in disease conditions; it includes two-dimensional (2D) imaging (planar scintigraphy) and three-dimensional (3D) imaging (single-photon emission computed tomography, SPECT, and positron emission tomography, PET). The functional information obtained by SPECT and PET may need to be coupled with the anatomic/morphologic information typically provided by computed tomography (CT) (hence SPECT and PET are now commonly called SPECT-CT and PET-CT): these approaches, named "hybrid imaging", have many advantages as well as high sensitivity, good spatial resolution, and the possibility to correctly locate functional abnormalities (by the SPECT or PET component) within a definite anatomic field (by the CT component) [34].The γ-emitting radionuclides that are used for planar and SPECT imaging are usually obtained within hospital nuclear medicine facilities (or research departments) from small portable generators; some are produced by nuclear reactors and then shipped to the hospital facility ready to use. The β+ emitting radionuclides ...

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“…One of the most innovative and environmentally friendly methods for producing nanoscale compounds is the use of low-temperature plasma discharges [11][12][13][14]. Currently, a large number of experimental installations for the formation of a plasma discharge above or in an aqueous medium are known.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles in the Presence of Polysaccharide: Optimization and Characterization

Скіба

Vorobyova

Пивоваров

et al. 2020

Journal of Nanomaterials

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The process of obtaining aqueous solutions of silver nanoparticles with the use of a low-temperature nonequilibrium contact plasma and stabilizing agent—polysaccharide (sodium alginate)—has been examined. The synthesized Ag NPs were characterized by using UV-Vis spectroscopy, dynamic light scattering (DLS), scanning electron microscope (SEM), and XRD analysis. The effect of concentration of Ag+, sodium alginate, duration of processing by plasma discharge, and pH of liquid on the production of silver nanoparticles has been studied. The results demonstrated that synthesis provides the formation of silver nanoparticles for investigated concentrations of Ag+ (0.3-3.0 mmol/l) and 5.0 g/l Na-Alg (pH=7–10) within 1–5 minutes. From the SEM images, the silver nanoparticles are found to be almost spherical. Powder XRD results reveal that Ag nanoparticles have a face-centered cubic crystal structure. Zeta potential of plasma-chemically obtained colloidal solutions at various concentrations of Ag+ ions and stabilizing agent varies from −32.8 to −39.3 mV, indicating the moderate stability of synthesized nanoparticles.

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Hydrophilic silver nanoparticles with tunable optical properties: application for the detection of heavy metals in water

Cited by 66 publications

References 52 publications

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots

Gold Nanoparticles and Nanorods in Nuclear Medicine: A Mini Review

Green Synthesis of Silver Nanoparticles in the Presence of Polysaccharide: Optimization and Characterization

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