Internally mixed nanoparticles from oscillatory spark ablation between electrodes of different materials

Feng, Jicheng; Ramlawi, Nabil; Biskos, George; Schmidt‐Ott, A.

doi:10.1080/02786826.2018.1427852

Cited by 35 publications

(35 citation statements)

References 28 publications

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Section: Engineering Compositionsupporting

confidence: 47%

“…This was confirmed by studying their crystal lattice shown in Figure 4a, and the corresponding fast Fourier transform (FFT) pattern displayed in the inset. Energy-dispersive X-ray spectroscopy (EDX) elemental mapping performed in HRSTEM (Figure 4b) and the corresponding elemental analysis (Figure 4c) of the nanoparticles confirmed not only the bimetallic nature of these SPNPs (with compositions around 68% of Au and 32% of Ag), but also their homogeneous composition distribution, with an average composition distribution of %Ag/%Au = 0.48 and a standard deviation of 0.02, which is an order of magnitude lower than previous results obtained by means of a gas-phase process without pre-alloyed sources [32]. Thus, the proposed SDG allows for tuning the composition of SPNPs, from non-agglomerated ultrapure monometallic to bimetallic nanoparticles, providing a greener route to multi-metallic nanoparticles able to explore other compositions, such as ceramic or even composite materials, by a careful choice of the electrodes materials (not restricted to alloy ones), atmosphere, and production parameters, in order to obtain specific non-agglomerated homogeneous nanoalloys on demand.…”

Section: Engineering Compositionsupporting

confidence: 47%

“…However, these mainly lead to agglomerated NPs [28][29][30][31], and require additional sintering/crystallization steps [15] to finally obtain non-agglomerated small bimetallic NPs (not SPNPs anymore). Some authors describe internally mixed NPs, using a conventional rod-to-rod SDG with electrodes of different composition [32]. Nevertheless, this gives rise to a broad NP composition distribution, which is explained in terms of the oscillatory behavior of discharges, inducing electrodes to take turns to emit vapor clouds.…”

Section: Engineering Compositionmentioning

confidence: 99%

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Green and Sustainable Manufacture of Ultrapure Engineered Nanomaterials

et al. 2020

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Nanomaterials with very specific features (purity, colloidal stability, composition, size, shape, location…) are commonly requested by cutting-edge technologic applications, and hence a sustainable process for the mass-production of tunable/engineered nanomaterials would be desirable. Despite this, tuning nano-scale features when scaling-up the production of nanoparticles/nanomaterials has been considered the main technological barrier for the development of nanotechnology. Aimed at overcoming these challenging frontier, a new gas-phase reactor design providing a shorter residence time, and thus a faster quenching of nanoclusters growth, is proposed for the green, sustainable, versatile, cost-effective, and scalable manufacture of ultrapure engineered nanomaterials (ranging from nanoclusters and nanoalloys to engineered nanostructures) with a tunable degree of agglomeration, composition, size, shape, and location. This method enables: (1) more homogeneous, non-agglomerated ultrapure Au-Ag nanoalloys under 10 nm; (2) 3-nm non-agglomerated ultrapure Au nanoclusters with lower gas flow rates; (3) shape-controlled Ag NPs; and (4) stable Au and Ag engineered nanostructures: nanodisks, nanocrosses, and 3D nanopillars. In conclusion, this new approach paves the way for the green and sustainable mass-production of ultrapure engineered nanomaterials.

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Section: Engineering Compositionsupporting

confidence: 47%

Section: Engineering Compositionsupporting

confidence: 47%

Section: Engineering Compositionmentioning

confidence: 99%

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Green and Sustainable Manufacture of Ultrapure Engineered Nanomaterials

et al. 2020

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“…Fig. 2) 31,32 . It means that by altering the symmetry of the current waveform, the relative erosion of the electrodes and hence the composition of the BNPs can be tuned.…”

Section: √ Lcmentioning

confidence: 99%

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Kohut

Villy

Kéri

et al. 2021

Sci Rep

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Gold/silver bimetallic nanoparticles still attract extensive interest due to their favorable properties e.g. in plasmonics or catalysis. We present here a facile and robust way for the production of clean Au/Ag binary nanoparticles (BNPs) with a total control over the composition via the spark discharge nanoparticle generation technique. With the application of pure Ag and Au electrodes, a tuning range of 55 to 90% Au content was achieved, but this can be further extended to the full 0 to 100% range by using a couple of alloyed electrodes. An added benefit of the approach is that either the concentration or the mean particle size can be kept constant at every composition by adjusting the generator parameters. Based on the systematic experimental data collected, a semi-empirical model for the prediction of the Au/Ag BNP composition was also developed. This model was used to calculate the theoretically achievable Au/Ag composition at a given spark parameter set in the parameter range most commonly used in the literature.

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“…[49] High-frequency spark ablation can be used to fabricate nanoparticles from bulk materials, [50] where the fast quenching induced by the short duration of spark pulses guarantees stoichiometric evaporation of the electrodes, with the resulting vapors subsequently forming alloy nanoparticles. [51,52] Recently Feng et al used this method to fabricate sub-10 nm LaFeSi MG nanoparticles, [52] which opens up a new route for the fabrication of MGNs from bulk materials, as shown in Figure 4. This recent report has significant potential that can convert BMGs into MGNs of a wide variety, and therefore could reveal the nanoeffect of MGs as electrocatalysts where BMGs were the primary investigated materials.…”

Section: Top-down Approachmentioning

confidence: 99%

Recent Advances in Metallic Glass Nanostructures: Synthesis Strategies and Electrocatalytic Applications

Doubek

McMillon‐Brown

et al. 2018

Advanced Materials

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transformers [2] and load bearing applications. [3] In the last few decades, the study of nanomaterials has become a central focus in nanoscience and nanotechnology. [4] In fact, many studies have shown that with reduction in size, nanomaterials display novel electrical, mechanical, chemical and optical properties, which are largely believed to be the result of surface and quantum confinement effects. [4,5] Remarkably, this trend has found traction in the metallic glass field where metallic glasses nanostructures (MGNs) demonstrate an important role in many applications such as light harvesting, [6] photovoltaic, [7] biomedical, [8] magneto-optical, [9] organic synthesis, [10] lithium-ion batteries [11] and electrocatalysis. [12] Recently, MGNs are receiving increased attention due to their distinguished performance, such as high activity and long term stability in electrocatalytic reactions. [12,13] Although several review papers have already covered the topic of nanopatterning of bulk metallic glasses (BMGs), [14][15][16] the correlation between recent synthetic methods and electrocatalytic applications for MGNs has not been thoroughly addressed. Moreover, there is currently no review that unites MGNs synthesized from different approaches (top-down and bottom-up) with conventional electrochemical reactions. Therefore, in this review our mission is to: 1) present a focused perspective on the latest fabrication techniques of MGNs toward the pursuit of novel electrocatalysts and electrodes; 2) highlight recent advances in computational screening and predictions that could be applied toward new metallic glass electrocatalyst discovery; and 3) report distinct advancements in electrocatalytic applications related to MGNs by creating a comprehensive discussion for commonly employed kinetic parameters and their connection with the unique material structure. Finally, as the first progress report on the metallic glass based electrocatalysts, we will also highlight some of the challenges that need to be addressed toward future progress in this field.BMGs are those metallic glasses (MGs) that can be made in 'bulk' scale with good glass forming abilities, [17] representing a versatile platform for many applications. To date, a wide range of BMG-forming alloys have been developed, including Zr-, [18] Fe-, [19] Cu-, [20] Ni-, [21] Ti-, [22] Mg-, [23] Pd-, [24] Au-, [25] and Pt-based compositions. [26] Moreover, the increased disorder brought by the higher degree of multinary systems is believed to contribute to improving the glass formation. [27] The evolution to multicomponent alloys of the most recent MG studies has also made them natural candidates for catalysis. The amorphous multinary Recent advances in metallic glass nanostructures (MGNs) are reported, covering a wide array of synthesis strategies, computational discovery, and design solutions that provide insight into distinct electrocatalytic applications. A brief introduction to the development and unique features of MGNs with an overview of top-down and bottom-up sy...

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Internally mixed nanoparticles from oscillatory spark ablation between electrodes of different materials

Cited by 35 publications

References 28 publications

Green and Sustainable Manufacture of Ultrapure Engineered Nanomaterials

Green and Sustainable Manufacture of Ultrapure Engineered Nanomaterials

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Recent Advances in Metallic Glass Nanostructures: Synthesis Strategies and Electrocatalytic Applications

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