Fabrication of nanoporous silver with open pores

Zhang, M.; Jorge, Alberto Moreira; Pang, Shujie; Zhang, T.; Yavari, A.R.

doi:10.1016/j.scriptamat.2014.11.040

Cited by 25 publications

(16 citation statements)

References 26 publications

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“…Erlebacher, J. proposed a mechanism for the formation of the porosity, which is consistent with experimental results and theoretical simulations of alloy dissolution [21][22][23]. To date, most of the reported NP metals share the same structure, consisting of long and narrow pores and coarsened ligaments [2,7,11,15,[24][25][26]. A typical example is shown in Fig.…”

Section: Introductionsupporting

confidence: 73%

“…They are promising materials for electrocatalysis [1][2][3][4], sensing [5][6][7], and energy storage devices [8]. Much work has been reported on NP metals, including Pt [9,10], Au [11][12][13], Pd [14], Ag [5,15], Cu [16][17][18], and Ni [19,20]. Erlebacher, J. proposed a mechanism for the formation of the porosity, which is consistent with experimental results and theoretical simulations of alloy dissolution [21][22][23].…”

Section: Introductionsupporting

confidence: 58%

“…It is obviously abnormal that Mg and Y atoms take up 85.65% of the total volume and EDS indicated no residual Mg and little Y, while a porosity of ~30% was observed. Moreover, the majority of other reported NP metals are in the same predicament more or less [15,24,25,31,32].…”

Section: Large Pore Volumesmentioning

confidence: 98%

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General synthesis of sponge-like ultrafine nanoporous metals by dealloying in citric acid

Hong

Pang

et al. 2016

Nano Res.

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A general method is proposed to synthesize ultrafine nanoporous Cu, Ag, and Ni with novel sponge-like morphologies, high porosities, and large surface areas. The materials are produced by dealloying Mg 65 M 25 Y 10 (M = Cu, Ag, and Ni) metallic glasses in citric acid. Citric acid played a key role due to its capping effect, which reduced the surface diffusion of metals. A structural model consistent with the sponge-like morphology was constructed to calculate the porosity and the surface area. The mechanism of the dealloying process in citric acid, involving ligament formation and coarsening, was illustrated. The mechanism was capable of explaining the experimental trends of dealloying, especially the morphology. A glucose sensor, which can be further developed into a high-precision real-time glucose monitor for medical use, was constructed using sponge-like nanoporous copper. Our findings are not only relevant to understanding the dealloying mechanism of metallic glasses, but also provide promising materials for multiple applications.

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Section: Introductionsupporting

confidence: 73%

Section: Introductionsupporting

confidence: 58%

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General synthesis of sponge-like ultrafine nanoporous metals by dealloying in citric acid

Hong

Pang

et al. 2016

Nano Res.

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“…Since the development of the field of nanoporous metals, a great number of works has been dedicated to the design of noble metalbased nanoporous architectured structures, among which silver plays an important role [46,[53][54][55][56]. Among others, nanoporous silver (NPS) was obtained in the group of De Hosson by dealloying Al from the amorphous Ag\ \Al precursor alloy [57].…”

Section: Introductionmentioning

confidence: 99%

“…In the previous work by M. Zhang et al [56] was reported the fabrication of a porous silver material with a submicron pore size. The precursor of the given work was an amorphous Ag 38.75 Cu 38.75 Si 22.5 alloy that was exposed to an appropriate etching condition in order to eliminate Cu and Si atoms, leaving a single Ag porous carcass.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous silver for electrocatalysis application in alkaline fuel cells

et al. 2016

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International audienceSelf-supporting porous silver foils with an average pore size <100 nm were produced from a crystalline silver-based ternary alloy as a precursor by removing second phases present in the silver matrix. The final Ag-based porous foil shows good mechanical properties when comparing to its previous amorphous analogues. Its activity for direct electrochemical oxidation of ammonia-borane (AB), a fuel of interest for direct liquid fuel cells, has been investigated in alkaline media. The material exhibits promising electrochemical properties in long-term operation; indeed, material composition and nanostructure remain similar after 15,000 cyclic-voltammetries between -0.3 and 0.5 V vs. RHE in a 0.1M NaOH+ 5mMAB solution thermostated at 25 degrees C. Nanoporous materials, and in particular nanoporous silver, can therefore represent a relevant choice as anode in direct ammonia-borane fuel cell. (C) 2016 Elsevier Ltd. All rights reserved

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Impact of the morphology and composition on the dealloying process of co‐sputtered silver–aluminum alloy thin films

Chauvin

Heu

Mel

2016

Physica Status Solidi (b)

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Dealloying has been widely employed lately for the fabrication of nanoporous metals. However, in case of thin films, the impact of the initial morphology on the final porosity is still not well understood. In this work, we report on the influence of the initial morphology of silver-aluminum (Ag-Al) thin films on the dealloying process in hydrochloric acid. The films deposition was performed by a DC co-sputtering process of silver and aluminum targets in a cofocal geometry using pure argon plasma; by tuning the deposition conditions such as the electrical powers applied to the targets and the deposition temperature, films with various compositions and morphologies can be obtained. The dealloying is then carried out using a free corrosion process applied in diluted (2 wt.%) hydrochloric acid in order to leach preferentially aluminum leaving behind a nanoporous skeleton of silver. We show that the dealloying process becomes faster when decreasing the initial silver content within the films. We further demonstrate that the dealloying kinetic is also dependent on the initial morphology of the Ag-Al films: it increases when decreasing the size of the columns forming the Ag-Al films.Top-view SEM image of Ag-Al alloy thin film with 23 at.% of initial Ag content dealloyed for 5 min in 2 wt.% hydrochloric acid.

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Fabrication of nanoporous silver with open pores

Cited by 25 publications

References 26 publications

General synthesis of sponge-like ultrafine nanoporous metals by dealloying in citric acid

General synthesis of sponge-like ultrafine nanoporous metals by dealloying in citric acid

Nanoporous silver for electrocatalysis application in alkaline fuel cells

Impact of the morphology and composition on the dealloying process of co‐sputtered silver–aluminum alloy thin films

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