Kinetics of the dissolution of pure silver and silver-gold alloys in nitric acid solution

Martínez, Llantén; Segarra, M.; López-Fernández, Margarita; Espiell, F.

doi:10.1007/bf02663143

Cited by 45 publications

(50 citation statements)

References 3 publications

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“…in the galvanic replacement or by utilizing a conventional wet etchant. [ 46,52,83 ] Figure 4 shows a schematic illustration and electron microscopy images of the nanostructures at different stages of the aforementioned dealloying processes. The starting sample was prepared by stopping the galvanic replacement reaction between Ag nanocubes and HAuCl 4 at a relatively early stage.…”

Section: Alloyingmentioning

confidence: 99%

25th Anniversary Article: Galvanic Replacement: A Simple and Versatile Route to Hollow Nanostructures with Tunable and Well‐Controlled Properties

et al. 2013

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This article provides a progress report on the use of galvanic replacement for generating complex hollow nanostructures with tunable and well-controlled properties. We begin with a brief account of the mechanistic understanding of galvanic replacement, specifically focused on its ability to engineer the properties of metal nanostructures in terms of size, composition, structure, shape, and morphology. We then discuss a number of important concepts involved in galvanic replacement, including the facet selectivity involved in the dissolution and deposition of metals, the impacts of alloying and dealloying on the structure and morphology of the final products, and methods for promoting or preventing a galvanic replacement reaction. We also illustrate how the capability of galvanic replacement can be enhanced to fabricate nanomaterials with complex structures and/or compositions by coupling with other processes such as co-reduction and the Kirkendall effect. Finally, we highlight the use of such novel metal nanostructures fabricated via galvanic replacement for applications ranging from catalysis to plasmonics and biomedical research, and conclude with remarks on prospective future directions.

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Section: Alloyingmentioning

confidence: 99%

25th Anniversary Article: Galvanic Replacement: A Simple and Versatile Route to Hollow Nanostructures with Tunable and Well‐Controlled Properties

et al. 2013

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“…Consequently the dealloying occurs when the component with the lower electrochemical potential is selectively removed from the alloyed walls in the final stages, in which a special etchant may be introduced. 87 Therefore alloying and dealloying play key roles in the galvanic replacement reaction. At last, the introduction of surfactants and trace ions, etchant and the presence of twin boundaries, defects, and vacancies may aslo affect morphologies of final products.…”

Section: Galvanic Replacementmentioning

confidence: 99%

Controlled Synthesis of Porous Platinum Nanostructures for Catalytic Applications

Zhang¹,

Yang²,

Huang³

et al. 2014

j. nanosci. nanotech.

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Porous platinum, that has outstanding catalytic and electrical properties and superior resistant characteristics to corrosion, has been widely applied in chemical, petrochemical, pharmaceutical, electronic, and automotive industries. As the catalytic activity and selectivity depend on the size, shape and structure of nanomaterials, the strategies for controlling these factors of platinum nanomaterials to get excellent catalytic properties are discussed. Here, recent advances in the design and preparation of various porous platinum nanostructures are reviewed, including wet-chemical synthesis, electro-deposition, galvanic replacement reaction and de-alloying technology. The applications of various platinum nanostructures are also discussed, especially in fuel cells.

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“…This is different from the dealloying of Ag-Au alloy to form nanoporous gold, in which the concentration of HNO 3 was rather high. For a dilute HNO 3 solution, the chemical reaction that may take place is given as follows [31]: (2) It is reported that the reaction is rather slow at HNO 3 concentrations of less than 3.80 M (ca. 16%) [31].…”

Section: Dealloying Of Ag-au Ncs and Formation Of Chainsmentioning

confidence: 99%

“…For a dilute HNO 3 solution, the chemical reaction that may take place is given as follows [31]: (2) It is reported that the reaction is rather slow at HNO 3 concentrations of less than 3.80 M (ca. 16%) [31]. A slow reaction could avoid the removal of the nanocages from the solid substrate.…”

Section: Dealloying Of Ag-au Ncs and Formation Of Chainsmentioning

confidence: 99%

Formation of substrate-based gold nanocage chains through dealloying with nitric acid

Yan¹,

Wu²,

Di³

2016

Nano Online

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Metal nanocages have raised great interest because of their new properties and wide applications. Here, we report on the use of galvanic replacement reactions to synthesize substrate-supported Ag-Au nanocages from silver templates electrodeposited on transparent indium tin oxide (ITO) film coated glass. The residual Ag in the composition was dealloyed with 10% nitric acid. It was found that chains of Au nanocages were formed on the substrate surface during dealloying. When the concentration of HNO 3 increased to 20%, the structures of nanocages were damaged and formed crescent or semi-circular shapes. The transfer process on the substrate surface was discussed.1362

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Kinetics of the dissolution of pure silver and silver-gold alloys in nitric acid solution

Cited by 45 publications

References 3 publications

25th Anniversary Article: Galvanic Replacement: A Simple and Versatile Route to Hollow Nanostructures with Tunable and Well‐Controlled Properties

25th Anniversary Article: Galvanic Replacement: A Simple and Versatile Route to Hollow Nanostructures with Tunable and Well‐Controlled Properties

Controlled Synthesis of Porous Platinum Nanostructures for Catalytic Applications

Formation of substrate-based gold nanocage chains through dealloying with nitric acid

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