Influence of pretreatment on the properties of Ag/α–Al2O3 catalysts containing large(± 1 µm) pure and Cs-promoted silver particles. Part 1.—Extent of oxygen and hydrogen sorption and TPD studies

In this review, we will bring the reader up to date with recent advances in the use of galvanic replacement reactions to engineer highly tunable nanostructures for a variety of applications. We will begin by discussing the variety of templates that have been used for such reactions and how the structural details (e.g., shape, size, and defects, among others) have interesting effects on the ultimate product, beyond serving as a simple site for deposition. This will be followed by a discussion of how we can manipulate the processes of alloying and dealloying to produce novel structures and how the type of precursor affects the final properties. Finally, the interesting optical properties of these materials and some innovative applications in areas of biomedical engineering and catalysis will be discussed, completing our overview of the state of the art in galvanic replacement.

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Engineering the properties of metal nanostructures via galvanic replacement reactions

Cobley

Xia

2010

Materials Science and Engineering: R: Reports

202

180

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Effects of cesium and chlorine on oxygen adsorption on promoted Ag/α-Al2O3 catalysts

Badani

Vannice

2000

Applied Catalysis A: General

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Mechanistic Studies on the Galvanic Replacement Reaction between Multiply Twinned Particles of Ag and HAuCl₄ in an Organic Medium

et al. 2007

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This article presents a mechanistic study on the galvanic replacement reaction between 11-and 14-nm multiply twinned particles (MTPs) of Ag and HAuCl 4 in chloroform. We monitored both morphological and spectral changes as the molar ratio of HAuCl 4 to Ag was increased. The details of reaction were different from previous observations on single-crystal Ag nanocubes and cubooctahedrons. Because Au and Ag form alloys rapidly within small MTPs rich in vacancy and grain boundary defects, a complete Au shell did not form on the surface of each individual Ag template. Instead, the replacement reaction resulted in the formation of alloy nanorings and nanocages from Ag MTPs of decahedral or icosahedral shape. For the nanorings and nanocages derived from 11-nm Ag MTPs, the surface plasmon resonance (SPR) peak can be continuously shifted from 400 to 616 nm. When the size of Ag MTPs was increased to 14 nm, the SPR peak can be further shifted to 740 nm, a wavelength sought by biomedical applications. We have also investigated the effects of capping ligands and AgCl precipitate on the replacement reaction. While hollow structures were routinely generated from oleylamine-capped Ag MTPs, we obtained very few hollow structures by using a stronger capping ligand such as oleic acid or tri-n-octylphosphine oxide (TOPO). Addition of extra oleylamine was found to be critical to the formation of well-controlled, uniform hollow structures free of AgCl contamination thanks to the formation of a soluble complex between AgCl and oleylamine.

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Influence of pretreatment on the properties of Ag/α–Al2O3 catalysts containing large(± 1 µm) pure and Cs-promoted silver particles. Part 1.—Extent of oxygen and hydrogen sorption and TPD studies

Cited by 3 publications

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Engineering the properties of metal nanostructures via galvanic replacement reactions

Engineering the properties of metal nanostructures via galvanic replacement reactions

Effects of cesium and chlorine on oxygen adsorption on promoted Ag/α-Al2O3 catalysts

Mechanistic Studies on the Galvanic Replacement Reaction between Multiply Twinned Particles of Ag and HAuCl₄ in an Organic Medium

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Influence of pretreatment on the properties of Ag/α–Al2O3 catalysts containing large(± 1 µm) pure and Cs-promoted silver particles. Part 1.—Extent of oxygen and hydrogen sorption and TPD studies

Cited by 3 publications

References 0 publications

Engineering the properties of metal nanostructures via galvanic replacement reactions

Engineering the properties of metal nanostructures via galvanic replacement reactions

Effects of cesium and chlorine on oxygen adsorption on promoted Ag/α-Al2O3 catalysts

Mechanistic Studies on the Galvanic Replacement Reaction between Multiply Twinned Particles of Ag and HAuCl4 in an Organic Medium

Contact Info

Product

Resources

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Mechanistic Studies on the Galvanic Replacement Reaction between Multiply Twinned Particles of Ag and HAuCl₄ in an Organic Medium