Structural evolution under physical and chemical stimuli of metastable Au–Fe nanoalloys obtained by laser ablation in liquid

Basagni, Andrea; Torresan, Veronica; Marzola, Pasquina; Raap, M. B. Fernández van; Nodari, Luca; Amendola, Vincenzo

doi:10.1039/d2fd00087c

Cited by 8 publications

(5 citation statements)

References 60 publications

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“…Medical applications for magnetic nanoalloys have been studied, including T2 MRI contrast agents [ 125 , 126 ] and hyperthermia ablation [ 127 , 128 ], as well as magnetic separation [ 129 , 130 ]. However, NP toxicity remains a serious issue that prevents their widespread use in biological treatment and diagnostics [ 131 , 132 ].…”

Section: Nanoalloy Synergistic Applicationsmentioning

confidence: 99%

Recent Advances in Synergistic Effect of Nanoparticles and Its Biomedical Application

Nanda,

2024

IJMS

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The synergistic impact of nanomaterials is critical for novel intracellular and/or subcellular drug delivery systems of minimal toxicity. This synergism results in a fundamental bio/nano interface interaction, which is discussed in terms of nanoparticle translocation, outer wrapping, embedding, and interior cellular attachment. The morphology, size, surface area, ligand chemistry and charge of nanoparticles all play a role in translocation. In this review, we suggest a generalized mechanism to characterize the bio/nano interface, as we discuss the synergistic interaction between nanoparticles and cells, tissues, and other biological systems. Novel perceptions are reviewed regarding the ability of nanoparticles to improve hybrid nanocarriers with homogeneous structures to enhance multifunctional biomedical applications, such as bioimaging, tissue engineering, immunotherapy, and phototherapy.

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Section: Nanoalloy Synergistic Applicationsmentioning

confidence: 99%

Recent Advances in Synergistic Effect of Nanoparticles and Its Biomedical Application

Nanda,

2024

IJMS

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“…In general, commonly used laser processes for the synthesis of nanoalloys are based on two approaches, the irradiation of alloy substrates with a target composition and the laser treatment of a mixture of monometallic colloids or metal salts in solution. [19,[20][21][22] It is also possible to form alloy nanoparticles by thermal diffusion of presynthesized hetero nanoparticles. The possibility of such a procedure was already published by Gonzáles-Rubio et al who obtained Au-Ag alloys starting from colloidal Au-Ag core-shell nanorods.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the isochoric melting process, the composition of the individual particles does not change compared to the initial hetero nanoparticles. Thus, the composition (gold to copper ratio) of the laser-induced nanoalloys can be previously adjusted and controlled by wet chemical synthesis, which opens the door for controllable alloying processes of a variety of further metal systems such as Au-Ag, [21][22][23]25] Ag-Bi, [26] Au-Fe, [20] Au-Zn, [27] Fe-Pt, [28] and Ag-Pt, [29] whose alloy formation could already be observed by LAL and LFL methods. In principle, the implementation of this method is conceivable for all alloy-forming metal systems as long as they exhibit suitable absorption properties in the range of the laser wavelength.…”

Section: Introductionmentioning

confidence: 99%

Composition‐Controlled Laser‐Induced Alloying of Colloidal Au–Cu Hetero Nanoparticles

Kranz

Bessel

Rosebrock

et al. 2023

Part & Part Syst Charact

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Due to their optical properties (localized surface plasmon resonance, LSPR), colloidally dispersed metal nanoparticles are well suited for selective heating by high‐energy laser radiation above their melting point without being limited by the boiling point of the solvent, which represents an excellent complement to wet‐chemical nanoparticle synthesis. By combining wet‐chemical synthesis and postsynthesis laser treatment, the advantages of both methods can be used to specifically control the properties of nanoparticles. Especially in the colloidal synthesis of nanoalloys consisting of two or more metals with different redox potentials, wet‐chemical synthesis quickly reaches its limits in terms of composition control and homogeneity. For this reason, the direct synthesis path is divided into two parts to take the strengths of both methods. After preparing Au–Cu hetero nanoparticles by wet‐chemical synthesis, nanoalloys with previous adjusted composition can be formed by postsynthesis laser treatment. The formation of these nanoalloys can be followed by different characterization methods, such as transmission electron microscopy (TEM), where the fusion of both metal domains and the formation of spherical and homogeneous Au–Cu nanoparticles can be observed. Moreover, the alloy formation can be followed by different shifts of X‐ray diffraction (XRD) reflections and LSPR maxima depending on the composition.

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“…Its numerous experimental parameters ensure the adaptation of the structural, magnetic and optical properties of single-element nanostructures [5][6][7][8]. Moreover, bimetallic nanoparticles (NPs) with tuneable chemical contents can also be easily synthesised by PLALs [9][10][11][12]. Nevertheless, there is still a great lack of research devoted to the laser ablation fabrication of semiconductor-metallic nanocomposites and studies of their structural and physicochemical properties.…”

Section: Introductionmentioning

confidence: 99%

“Green” Fluorescent–Plasmonic Carbon-Based Nanocomposites with Controlled Performance for Mild Laser Hyperthermia

Ryabchikov,

Zaderko

2023

Photonics

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Fluorescent carbon nanodots are a promising nanomaterial for different applications in biophotonics, sensing and optical nanothermometry fields due to their strong fluorescence properties. However, their multi-modal applications are considerably limited, requiring the use of several nanoagents that could solve different tasks simultaneously. In this paper, we report the first experimental results on a facile “green” laser-based synthesis of multi-modal carbon–metallic nanocomposites with tuned optical performance. This simple approach leads to the appearance of finely controlled plasmonic properties in carbon-based nanocomposites whose spectral position is adapted by using an appropriate material. Thus, longer laser ablation provokes 29-fold increase in the absorption intensity of carbon–gold nanocomposites due to the increase in the metal content from 13% (30 s) to 53% (600 s). Despite strong plasmonic properties, the metal presence results in the quenching of the carbon nanostructures’ fluorescence (2.4-fold for C-Au NCs and 3.6-fold for C-Ag NCs for 600 s ablation time). Plasmonic nanocomposites with variable metal content reveal a ~3-fold increase in the laser-to-heat conversion efficiency of carbon nanodots matching the temperature range for mild hyperthermia applications. The findings presented demonstrate a facile approach to expanding the properties of chemically prepared semiconductor nanostructures due to the formation of novel semiconductor–metallic nanocomposites using a “green” approach. Together with the ease in control of their performance, it can considerably increase the impact of semiconductor nanomaterials in various photonic, plasmonic and biomedical applications.

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Structural evolution under physical and chemical stimuli of metastable Au–Fe nanoalloys obtained by laser ablation in liquid

Abstract: Metastable alloy nanoparticles are investigated for their variety of appealing properties exploitable for photonics, magnetism, catalysis and nanobiotechnology. Noteworthy, nanophases out of thermodynamic equilibrium are featured by a complex “ultrastructure”...

Cited by 8 publications

References 60 publications

Recent Advances in Synergistic Effect of Nanoparticles and Its Biomedical Application

Recent Advances in Synergistic Effect of Nanoparticles and Its Biomedical Application

Composition‐Controlled Laser‐Induced Alloying of Colloidal Au–Cu Hetero Nanoparticles

“Green” Fluorescent–Plasmonic Carbon-Based Nanocomposites with Controlled Performance for Mild Laser Hyperthermia

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