One‐Step Photochemical Green Synthesis of Water‐Dispersible Ag, Au, and Au@Ag Core–Shell Nanoparticles

Perez-Lloret, Marta; Fraix, Aurore; Petralia, Salvatore; Conoci, Sabrina; Tafani, Virginie; Cutrone, Giovanna; Vargas‐Berenguel, Antonio; Gref, Ruxandra; Sortino, Salvatore

doi:10.1002/chem.201903076

Cited by 9 publications

(4 citation statements)

References 53 publications

(33 reference statements)

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“…Additionally, it is desired that the preparation process obviates any need for highly laborious size sorting or seeding of any preformed crystals . Natural products such as extracts from the plants have been demonstrated to be successful for obtaining nanotriangles and nanoflowers with near-infrared (NIR) LSPR by green procedures. − Besides, photochemical approaches in the synthesis of Au nanostructures are also very appealing. − Photons are, in fact, “green reactants” with low cost and ease of manipulation in terms of intensity, wavelength, duration, and location. Recently, fascinating examples of the plasmon-mediated synthesis of anisotropic Au nanostructures have been shown. , These procedures involve light excitation of preformed Au seeds, followed by many possible subsequent effects such as local heating of the Au seeds, concentration of the incident light near the particle surface, and generation of electron–hole pairs that can participate in charge-transfer reactions between the metal particle and nearby molecules.…”

Section: Introductionmentioning

confidence: 99%

Biofriendly Route to Near-Infrared-Active Gold Nanotriangles and Nanoflowers through Nitric Oxide Photorelease for Photothermal Applications

Nocito

Petralia

Béni

et al. 2019

ACS Appl. Nano Mater.

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The development of ecofriendly synthetic protocols for the fabrication of nonspherical gold (Au) nanoobjects with localized surface plasmon resonance (LSPR) falling in the near-infrared (NIR) region is one challenging topic in modern materials science. Among others, such metallic nanostructures have intriguing applications in nanomedicine because of their photothermal properties activated by light excitation in the so-called therapeutic window (λmax = 650–1300 nm). Here we report an unprecedented, simple, and “green” methodology to prepare water-dispersible Au nanotriangles and nanoflowers with NIR LSPR (λmax = 850–1250 nm). They are obtained in a single step at room temperature and in a few minutes by using one of the most biologically relevant molecules, nitric oxide (NO), generated by visible-light irradiation of a tailored β-cyclodextrin-branched polymer, without the need of preformed seeds, external reducing and sacrificial agents, conventional surfactants, and stabilizing ligands. Biocompatibility and effective photothermal applications of these metallic nanostructures are demonstrated by a photothermally activated enzymatic reaction and photothermal-induced sarcoma cancer cell mortality using 808 nm light. This approach may pave the way for completely unexplored, facile, and bio/ecofriendly synthetic protocols based on the photogeneration of NO through biocompatible polymeric scaffolds, for the preparation of Au nanostructures directed toward bioapplications.

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Section: Introductionmentioning

confidence: 99%

Biofriendly Route to Near-Infrared-Active Gold Nanotriangles and Nanoflowers through Nitric Oxide Photorelease for Photothermal Applications

Nocito

Petralia

Béni

et al. 2019

ACS Appl. Nano Mater.

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“…Recently, water-soluble noble metal NPs were evolved in aqueous solution. 64 Although it is convenient to evolve normal Au core -Ag shell particles under normal conditions with preformed Au nanoparticles, the reverse case of bimetallic particle formation has become possible. 63 Again, selective gold dissolution by cyanide has been experimentally explored using uorescence probes.…”

Section: Core-shell Metal Particles Of Au and Agmentioning

confidence: 99%

Electrochemical aspects of coinage metal nanoparticles for catalysis and spectroscopy

Roy

Pal

2022

RSC Adv.

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“…However the presence of silver ions in the reaction mixture may lead to the bimetallic nanoparticles. Sortino et al 33 report on a effective preparation of Ag, Au, and Au@Ag core−shell nanoparticles based on the light irradiation of a biocompatible, water-soluble dextran functionalized with benzophenone in the presence of AgNO 3 , HAuCl 4, or both.…”

Section: Introductionmentioning

confidence: 99%

Machine Learning Analysis of Reaction Parameters in UV-Mediated Synthesis of Gold Nanoparticles

et al. 2023

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Gold nanoparticles represent an important class of functional nanomaterials for optoelectronics, biomedical applications, and catalysis. Therefore, controllable synthesis of nanoparticles with specified size and shape is important. Though reduction of gold ions is quite a simple process and may be performed with many different protocols, the reproducibility of the results and transfer of protocols between independent research groups remains a challenging task. Machine learning analysis based on statistical approaches is hardly applicable to the published data, since most of the researchers report only successful syntheses. In this work, we apply uniform sampling of the reaction parameter space. The concentrations of gold precursor, reducing agent, and surfactant were varied via an improved Latin hypercube sampling, and each run was performed under in situ UV−vis control. Based on the resulting set of optical spectra, we address the relevant chemical questions about nanoparticle formation, their shape, and period of growth. Our work demonstrates a data driven approach applied to the space of reaction parameters in a limited available set of experiments.

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One‐Step Photochemical Green Synthesis of Water‐Dispersible Ag, Au, and Au@Ag Core–Shell Nanoparticles

Cited by 9 publications

References 53 publications

Biofriendly Route to Near-Infrared-Active Gold Nanotriangles and Nanoflowers through Nitric Oxide Photorelease for Photothermal Applications

Biofriendly Route to Near-Infrared-Active Gold Nanotriangles and Nanoflowers through Nitric Oxide Photorelease for Photothermal Applications

Electrochemical aspects of coinage metal nanoparticles for catalysis and spectroscopy

Machine Learning Analysis of Reaction Parameters in UV-Mediated Synthesis of Gold Nanoparticles

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