Green manufacturing of metallic nanoparticles: a facile and universal approach to scaling up

Feng, Jicheng; Guo, Xiaoai; Ramlawi, Nabil; Pfeiffer, Tobias; Geutjens, Ruben; Basak, Shibabrata; Nirschl, Hermann; Biskos, George; Zandbergen, H.W.; Schmidt‐Ott, A.

doi:10.1039/c6ta03221d

Cited by 37 publications

(34 citation statements)

References 51 publications

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“…This is probably because Equation (1) and therewith Equation (4) does not capture the energy loss by thermal conduction of the electrodes (Ag conductivity is approximately six times higher than that of Pd) (Tabrizi et al 2009a;Feng et al 2015Feng et al , 2016c. Figure 3 shows a simplification of the circuit of the high frequency sparks (HFS) used in this work (Feng et al 2016a). Here we develop a model for linking the electrical parameters to the current oscillations, which in turn determines the ablation ratio of the electrodes.…”

Section: Separation Of the Material-independent Factor And The Materimentioning

confidence: 99%

“…The fraction m Au D C /m Pd D A denotes the mass ratio of the cathode and the anode materials in the NPs. These values are equal to the ratio of Δm C /Δm A (mass ablated per spark from the cathode to that of the anode), as the mass ablated from the electrodes is essentially converted to NPs (Feng et al 2016a).…”

Section: Separation Of the Material-independent Factor And The Materimentioning

confidence: 99%

“…The initial potential difference U C applied over the electrodes can be set independently of the breakdown voltage due to the decoupling of the charge cycle from that of discharge (Feng et al 2016a). Such separation is achieved by adding fast switches in the classical spark circuit (Pfeiffer et al 2014;Feng et al 2016a). Besides keeping a constant U c , a low-power source provides a continuous low current in the discharge gap.…”

Section: Different Electrodesmentioning

confidence: 99%

“…Gas-phase spark ablation enables the manufacturing of a range of NPs with different properties (Feng 2016). Its unique feature lies in the capability of single-step manufacturing NPs with virtually unlimited mixing combinations (Byeon et al 2008;Tabrizi et al 2009b;Maisser et al 2015;Feng et al 2015Feng et al , 2016aFeng et al , 2016c. The resulting NPs cover any form of nanoparticulate mixtures, mixed at nanometer and/or atomic scale.…”

Section: Introductionmentioning

confidence: 99%

“…In a spark-discharge NP generator, a pair of electrodes is connected to a pulse-forming electrical circuit that periodically initiates a spark discharge in the interelectrode gap, where high-purity inert gas flows (Schwyn et al 1988;Feng et al 2016a). The sparks evaporate electrode materials, and the resulting vapors subsequently form NPs that retain the electrode (bulk) composition.…”

Section: Introductionmentioning

confidence: 99%

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

Feng

Ramlawi

Biskos

et al. 2018

Aerosol Science and Technology

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The increasing need for engineered alloy nanoparticles (NPs) in diverse fields has spurred efforts to explore efficient/green synthesis methods. In this respect, spark ablation provides a scalable and viable way for producing widely different types of mixed NPs. Most importantly, implementation of the spark has the great advantage to combine a wider range of materials, thereby allowing the synthesis of mixed NPs with virtually unlimited combinations. Here we show that polarity reversal of spark discharges between two electrodes consisting of different materials enables synthesis of alloy NPs, while having a good potential to control the broadness of their composition distribution. A model developed in this work provides a tool for tuning the ablation ratio between the electrodes by adjusting the electric characteristics of the spark circuit. The ablation ratio is equal to the mean composition of the resulting NPs. The model predictions are in accordance with measurements obtained here and in earlier works. The unique way of producing alloy NPs by spark ablation shown in this work becomes especially useful when the starting electrode materials are immiscible at macroscopic scale.

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Section: Separation Of the Material-independent Factor And The Materimentioning

confidence: 99%

Section: Separation Of the Material-independent Factor And The Materimentioning

confidence: 99%

Section: Different Electrodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Feng

Ramlawi

Biskos

et al. 2018

Aerosol Science and Technology

Self Cite

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Programmable and Parallel 3D Nanoprinting Using Configured Electric Fields

Liu,

Ai,

Zhang

et al. 2023

Adv Funct Materials

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Printing metallic nanoscale features remains challenging, but particularly important for making electronic devices. In existing techniques, complex operation, and material parameters significantly limit printing resolution, materials development, and real‐time control. Alternatively, aerosols and ions are synergized to print nanoscale metals, but the ions turn out to be instable, thereby making the printing lose the ability in controlling feature sizes. Herein electrically biased parallel planes are utilized to configure electric fields for programmable and parallel printing of aerosol nanoparticles into high‐purity (>98.5 wt.%) nanoscale features in arrays over large areas (≈mm2). By applying different potentials to three horizontal parallel planes, with the middle plane containing periodic circular perforations, the fields are configured into repeating “funnels” with sizes controllable at both ends. Charged nanoparticles are then subjected to a gas flow orthogonal to the field assembling them to 3D nanoarchitectures. The “funnels” size is predictable and used to control the feature sizes. The printed nanopillars are modulated from 67 to 743 nm in diameters with aspect ratios up to 25 and show excellent mechanical and electrical properties. The programmable and parallel nanoprinting of metallic nanoscale features offers an enabling technology for accelerating the development of next‐generation high‐frequency ultra‐large scale integrated electronic devices.

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Operando Colorations from Real‐Time Growth of 3D‐Printed Nanoarchitectures

Liu,

Feng

2024

Advanced Materials

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While artificial 3D nanostructures can generate precise and flexible coloration, their real‐time color changes during 3D nanoprinting remain unexplored owing to the inherent challenges of in situ transient measurements and observations. In this study, a 3D‐printing system which supports the operando observation/measurement of the color dynamics of subwavelength metallic nanoarchitectures fabricated in real time is developed and evaluated. During 3D printing, the dimensions and geometries of the 3D nanostructures grow over time, producing a large library of optical spectra associated with real‐time color changes. Only a timer is needed to define the expected colors from a single 3D print run. Fin‐like nanostructures are used to toggle colors based on the polarization effect and produce color gradients. Based on structural coloration, nanoarchitectures are designed and printed to animate desired color patterns. Moreover, the resulting color dynamics can also serve as an operando identifier for real‐time structural information during 3D nanoprinting. A single print run enables the efficient creation of a comprehensive library of desired colorations owing to the flexibility in time‐dependent controllability and 3D geometries at the subwavelength scale. 3D nanoprinted plasmonic structures exhibiting time‐varying colorations (4D printing of colors) uniquely redefines the coloring stategy, offering considerable potential for numerous applications.

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Green manufacturing of metallic nanoparticles: a facile and universal approach to scaling up

Abstract: A newly developed high frequency spark provides a green, sustainable and versatile platform for manufacturing diverse sub-10 nm particles with well-defined chemical composition that serve as key building blocks.

Cited by 37 publications

References 51 publications

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

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

Programmable and Parallel 3D Nanoprinting Using Configured Electric Fields

Operando Colorations from Real‐Time Growth of 3D‐Printed Nanoarchitectures

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