Controlling alloy formation and optical properties by galvanic replacement of sub-20 nm silver nanoparticles in organic media

Collins, Gillian; McCarty, E. K.; Holmes, Justin D.

doi:10.1039/c5ce00659g

Cited by 17 publications

(17 citation statements)

References 31 publications

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“…In 2015, based on Xia's and Sastry's previous studies, [39,40] Holmes and co-workers reported that Au atoms replaced Ag atoms of multiply twinned AgNPs to form nanorings, nanocages, or solid alloy NPs depending on the size of the NPs. [41] From these results, 8 nm AgNPs favor nanorings, while smaller AgNPs (6 nm) form solid alloys, and larger AgNPs (15 nm) lead to nanocages (Figure 5).…”

Section: Nanoringsmentioning

confidence: 90%

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From Galvanic to Anti‐Galvanic Synthesis of Bimetallic Nanoparticles and Applications in Catalysis, Sensing, and Materials Science

Liu

Astruc

2017

Advanced Materials

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The properties of two alloyed metals have been known since the Bronze Age to outperform those of a single metal. How alloying and mixing metals applies to the nanoworld is now attracting considerable attention. The galvanic process, which is more than two centuries old and involves the reduction of a noble-metal cation by a less noble metal, has not only been used in technological processes, but also in the design of nanomaterials for the synthesis of bimetallic transition-metal nanoparticles. The background and nanoscience applications of the galvanic reactions (GRs) are reviewed here, in particular with emphasis on recent progress in bimetallic catalysis. Very recently, new reactions have been discovered with nanomaterials that contradict the galvanic principle, and these reactions, called anti-galvanic reactions (AGRs), are now attracting much interest for their mechanistic, synthetic, catalytic, and sensor aspects. The second part of the review deals with these AGRs and compares GRs and AGRs, including the intriguing AGRs mechanism and the first applications.

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Section: Nanoringsmentioning

confidence: 90%

“…Reproduced with permission [41]. c,f,i) HRTEM of AgAu nanocages (c), nanorings (f), and solid alloyed NPs (i).…”

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confidence: 99%

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From Galvanic to Anti‐Galvanic Synthesis of Bimetallic Nanoparticles and Applications in Catalysis, Sensing, and Materials Science

Liu

Astruc

2017

Advanced Materials

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“…Furthermore, the ability to perform nonaqueous galvanic replacement of Ag NP templates of various sizes and shapes, with control over the stoichiometry of the final product, has important implications for LSPR tuning and surface functionalization. Reports of nonaqueous galvanic replacement approaches, which exist only for toluene, dichlorobenzene, and chloroform, all focus on the replacement of sub‐25 nm isotropic Ag templates with Au to produce Au nanocages; as of yet none involve large, anisotropic structures or tunable morphologies.…”

Section: Introductionmentioning

confidence: 99%

Controllably Hollow AgAu Nanoparticles via Nonaqueous, Reduction Agent‐Assisted Galvanic Replacement

Rehn

Ringe

2018

Part & Part Syst Charact

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The galvanic replacement reaction is a robust tool for the controlled synthesis of hollow and semihollow bimetallic nanostructures, which have applications in a range of science, engineering, and medical fields due to the tunability of their localized surface plasmon resonances (LSPRs) and surface chemistry. Here, a controllable galvanic replacement of Ag by Au coupled with coreduction is described, performed in nonaqueous solvents including methanol, ethanol, and an N,N‐dimethylformamide:toluene mixture and yielding hollow and semihollow alloyed nanoparticles. Structural control, from semihollow to nanoshell, and plasmon tunability are demonstrated via control of the Au:Ag stoichiometry. The high structural dependence on temperature is shown, with striking changes in nanoparticle surface smoothness and pinhole density, and reveals the optimal reaction temperature to be 65 °C in alcohols. Through optimizing this reaction, smooth closed shell AgAu alloy nanoparticles with LSPRs tunable from 494 to 567 nm are obtained. This work provides a framework for galvanic replacement of large anisotropic Ag nanoparticles with Au in nonaqueous media, which can be extended to other solvent systems suitable for air‐sensitive metals and precursors.

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“…However, there are some drawbacks to conventional galvanic replacement. First, excessive replacement causes fragmentation or aggregation because of uncontrollable replacement after the formation of a nanoshell [104,105]. Second, insoluble byproducts such as AgCl are formed by the dissolved template element (Ag + ), and the counter ion of the replacing cation (Cl -) is deposited on the surface of the particles, reducing colloidal stability [106][107][108].…”

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confidence: 99%

Recent Advances in Nanoparticle Shape and Composition Regulation Based on Galvanic Replacement for Cancer Treatment

Shin¹,

Kang²,

Jang³

2018

Preprint

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Owing to their unique physicochemical properties, nanoparticles are used in a variety of ways in the field of cancer treatment, including imaging, drug delivery, and photothermal and photodynamic therapies. The fascinating properties of nanoparticles are determined by their size, morphology, and constituent elements, and various synthetic methods and post-synthetic techniques have been applied to control these factors. Herein, we present examples of shape and composition control through galvanic replacement, a technique that exploits redox potential differences between elements to induce spontaneous ion-exchange and highlight its specific contributions to cancer treatment applications. The present article identifies the recent advances in nanoparticle formation techniques and discusses the future outlook of the field.

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Controlling alloy formation and optical properties by galvanic replacement of sub-20 nm silver nanoparticles in organic media

Abstract: Galvanic replacement is a versatile synthetic strategy for the synthesis of alloy and hollow nanostructures.

Cited by 17 publications

References 31 publications

From Galvanic to Anti‐Galvanic Synthesis of Bimetallic Nanoparticles and Applications in Catalysis, Sensing, and Materials Science

From Galvanic to Anti‐Galvanic Synthesis of Bimetallic Nanoparticles and Applications in Catalysis, Sensing, and Materials Science

Controllably Hollow AgAu Nanoparticles via Nonaqueous, Reduction Agent‐Assisted Galvanic Replacement

Recent Advances in Nanoparticle Shape and Composition Regulation Based on Galvanic Replacement for Cancer Treatment

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