Structure analysis of precursor alloy and diffusion during dealloying of Ag–Al alloy

Zhang, Runwei; Wang, Xu; Zhang, Zhichao; Huang, J.C.; Shi, Feng; Wu, Ming

doi:10.1039/c7ra12915g

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…At the same time, individual studies on electroless dealloying at room temperature found it to be 0.36. 60 For Ag−Al alloys, Zhang et al 61 revealed that the coarsening exponent for electroless dealloying at 60 °C depends on precursor compositions (i.e., 60−70 at. % of Al) with values ranging from 0.13 to 0.49, and the authors argued that the Ag content and the alloy phases in the precursor alloy introduce variability and different coarsening rates.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Electroless Dealloying of Thin-Film Nanocrystalline Au–Ag Alloys: Mechanisms of Ligament Nucleation and Sources of Its Synthesis Variability

Niauzorau

Sharstniou

Sampath

et al. 2022

ACS Appl. Mater. Interfaces

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Control of ligament size in nanoporous gold through process inputs in chemical dealloying holds the potential to exploit its size dependent properties in applications in energy and biomedicine. While its morphology evolution is regulated by the kinetics of coarsening, recent studies are focused on the early stage of dealloying (e.g., ∼ 5−42 at. % in residual alloy content) to understand mechanisms of ligament nucleation and its role in altering process−structure relationships. This paper examines this stage in chemical dealloying of nanocrystalline Au 49 Ag 51 thin films and finds that ligaments are nucleated uniformly through its thickness due to the dealloying front rapidly propagating through the thickness of the film. Further, through the establishment of process−structure relationships with large data sets (i.e., 80 samples), this paper quantifies sources of variability that alter the kinetics of ligament growth such as aging of the precursor (e.g., grain growth) and solution evaporation. It is found that ligament diameter is better predicted by the residual silver content rather than by the dealloying time even amidst both effects and independent control of ligament diameter and solid area fraction is demonstrated within a limited window.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Electroless Dealloying of Thin-Film Nanocrystalline Au–Ag Alloys: Mechanisms of Ligament Nucleation and Sources of Its Synthesis Variability

Niauzorau

Sharstniou

Sampath

et al. 2022

ACS Appl. Mater. Interfaces

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“…Dealloying temperature and time have notable effects on the ligament/pore structure of the nanoporous metals [13,[15][16][17][18]. Dealloying temperature is an essential factor in the formation of nanoporous structures.…”

Section: Dealloying Temperature and Timementioning

confidence: 99%

“…and d(t) is pore size at etching time t; k 0 , K, and D 0 are constants and k 0 =KD 0 ; n is coarsening exponent, reflecting surface relaxation of roughened metals in solutions; R is the gas constant; T is the etching temperature; E is the activation energy for the nanopore formation and coarsening; k is Boltzmann constant (1.3806×10 -23 J K −1 ), γ is surface energy (1.24 J m −2 ) [17], and a is the lattice parameter of Ag (0.4086 nm).…”

Section: Dealloying Temperature and Timementioning

confidence: 99%

A novel dealloying strategy for fabricating nanoporous Ag via ζ′-AgGa alloy

Jiang¹,

Zhang²,

Wang³

et al. 2022

Nanotechnology

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A mild strategy for fabricating nanoporous silver (np-Ag) pieces was reported via preparation of Ag-Ga alloys in relatively low temperature and subsequent electrochemical dealloying in nitric acid (HNO3) aqueous solution. After selectively etching Ga out of the Ag-Ga alloy, a typical three-dimensional (3D) bicontinuous nanoporous structure with a pore size of ~67.21nm-159.33nm was observed. A series of studies have shown that the addition of SDS results in minimum pore size. The coarsen exponent (n) is 1.58, and the activation energy was calculated to be 27.04 kJ/mol. The ζ’-AgGa alloy prepared at low temperature can be used as the precursor for the preparation of fine np-Ags, and this method provides a new strategy for the industrial production of dealloyed np-Ag.

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“…7,8 To date, dealloying has been applied to fabricate nanoporous metals from different alloy systems, such as Ag-Al, Al-Cu, Au-Cu, Au-Ag, Cu-Zr alloys. [9][10][11][12][13] In this research, a comparative commercial Ag-Cu alloy system was chosen to be investigated. According to existing research, the microstructure of the asdealloyed sample could be affected by many factors, such as nature of the precursor alloy, composition of the precursor alloy, dealloying time, dealloying temperature, and dealloying solution.…”

Section: Introductionmentioning

confidence: 99%

Formation mechanism of nanoporous silver during dealloying with ultrasonic irradiation

et al. 2019

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Structure analysis of precursor alloy and diffusion during dealloying of Ag–Al alloy

Cited by 7 publications

References 38 publications

Electroless Dealloying of Thin-Film Nanocrystalline Au–Ag Alloys: Mechanisms of Ligament Nucleation and Sources of Its Synthesis Variability

Electroless Dealloying of Thin-Film Nanocrystalline Au–Ag Alloys: Mechanisms of Ligament Nucleation and Sources of Its Synthesis Variability

A novel dealloying strategy for fabricating nanoporous Ag via ζ′-AgGa alloy

Formation mechanism of nanoporous silver during dealloying with ultrasonic irradiation

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