Growth pathways of exotic Cu@Au core@shell structures: the key role of misfit strain

Koraychy, El Yakout El; Ferrando, Riccardo

doi:10.1039/d2nr05810c

Cited by 9 publications

(14 citation statements)

References 40 publications

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“…39,40 This potential for AuCu, whose form and parameters are given in ref. 18 and 36, has been previously tested against DFT calculations 36 obtaining a good agreement.…”

Section: Computational Detailsmentioning

confidence: 99%

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Growth pathways of Cu shells on Au and AuCu seeds: interdiffusion, shape transformations, strained shells and patchy surfaces

El koraychy,

Ferrando

2023

Nanoscale Adv.

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“…39,40 This potential for AuCu, whose form and parameters are given in ref. 18 and 36, has been previously tested against DFT calculations 36 obtaining a good agreement.…”

Section: Computational Detailsmentioning

confidence: 99%

“…10 In fact, AuCu nanoparticles with different chemical ordering arrangements have been obtained in several experiments and simulations. 11–18…”

Section: Introductionmentioning

confidence: 99%

Growth pathways of Cu shells on Au and AuCu seeds: interdiffusion, shape transformations, strained shells and patchy surfaces

El koraychy,

Ferrando

2023

Nanoscale Adv.

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“…39 Moreover, the development of faulted layers during crystal growth can be induced by a second metal in nanoalloys, 40−42 inducing surface reconstruction and decreasing the free surface energy to stabilize uncommon structures. 18,35,43,44 In this way, bimetallic systems present unusual MTP structures shaped from structural defects and composition inhomogeneities, which has repercussions in the free surface energy minimization in the small size regime.…”

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confidence: 99%

“…Recent studies demonstrated that the growth pathways for Dh and Ih formation depend on how initial tetrahedra form and evolve. − These initial tetrahedra can stabilize new twin boundaries (TB) overgrowing into Dh or, subsequently, Ih . Moreover, the development of faulted layers during crystal growth can be induced by a second metal in nanoalloys, − inducing surface reconstruction and decreasing the free surface energy to stabilize uncommon structures. ,,, In this way, bimetallic systems present unusual MTP structures shaped from structural defects and composition inhomogeneities, which has repercussions in the free surface energy minimization in the small size regime.…”

mentioning

confidence: 99%

“…Xia and co-workers 81 reported the transformation of octahedra to tetrahedra of Pt-NPs, observing the formation of two-dimensional islands at the edges of NPs forming fault defects that became the key symmetry-breaking mechanism for the autocatalytic transformation, supporting the key role of pure growth kinetics in structural transformations. Recently, El Koraychy and Ferrando 43 reported the formation of exotic dIh and triple Ih in Cu@Au NPs from the evolution of a Dh seed. The structural features were modified depending on the seed type.…”

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Experimental High-Resolution Observation of the Truncated Double-Icosahedron Structure: A Stable Twinned Shell in Alloyed Au–Ag Core@Shell Nanoparticles

Mendoza-Cruz,

Palomares-Báez,

López-López

et al. 2024

Nano Lett.

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Given the binary nature of nanoalloy systems, their properties are dependent on their size, shape, structure, composition, and chemical ordering. When energy and entropic factors for shapes and structure variations are considered in nanoparticle growth, the spectra of shapes become so vast that even metastable arrangements have been reported under ambient conditions. Experimental and theoretical variations of multiply twinned particles have been observed, from the Ino and Marks decahedra to polyicosahedra and polydecahedra with comparable energetic stability among them. Herein, we report the experimental production of a stable doubly truncated double-icosahedron structure (TdIh) in Au−Ag nanoparticles, in which a twinned Ag-rich alloyed shell is reconstructed on a Au−Ag alloyed Inodecahedral core. The structure, chemical composition, and growth pathway are proposed on the basis of high-angle annular darkfield scanning transmission electron microscopy analysis and excess energy calculations, while its structural stability is estimated by large-scale atomic molecular dynamics simulations. This novel nanostructure differs from other structures previously reported.

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Advances in Strain‐Induced Noble Metal Nanohybrids for Electro‐Catalysis: From Theoretical Mechanisms to Practical Use

Chen,

Li,

Zhao

et al. 2024

ChemElectroChem

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In response to the climate goal of achieving carbon neutrality by 2050, efficient electrochemical energy conversion devices are garnering increasing attention. However, the enhancement of electrochemical performance using noble metal electrocatalysts, along with cost reduction and electrode fabrication, remain significant challenges. Noble metal hybrid nanostructures, possessing multiple surface functionalities, lead to outstanding electrocatalytic performances and low‐cost potential. Strain effects can bolster the bonding strength between the noble metal layers and the substrate or core layers, while simultaneously affecting electrocatalytic performance through tuning the binding strength between catalytically active sites and reactants, including intermediates. This review encapsulates the research efforts directed towards improving the performance of noble metal electrocatalysts and provides an overview of the latest advancements in controlling the surface state of noble metals by incorporating a secondary component. We discuss systematic approaches to adjusting surface strain effects on noble metals, characterization techniques, and application case studies, while extracting key design indicators for readers to consider from a macroscopic perspective. Further, we outline the challenges encountered and current solutions when advancing noble metal catalysts from theoretical mechanisms to practical use. Finally, the perspectives on the future research of noble metal surface layer control techniques were also provided.

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Growth pathways of exotic Cu@Au core@shell structures: the key role of misfit strain

Abstract: The CuAu system is characterized by a large lattice mismatch which causes a misfit strain in its core@shell architectures. Here we simulate the formation of Cu@Au core@shell nanoparticles by Au...

Cited by 9 publications

References 40 publications

Growth pathways of Cu shells on Au and AuCu seeds: interdiffusion, shape transformations, strained shells and patchy surfaces

Growth pathways of Cu shells on Au and AuCu seeds: interdiffusion, shape transformations, strained shells and patchy surfaces

Experimental High-Resolution Observation of the Truncated Double-Icosahedron Structure: A Stable Twinned Shell in Alloyed Au–Ag Core@Shell Nanoparticles

Advances in Strain‐Induced Noble Metal Nanohybrids for Electro‐Catalysis: From Theoretical Mechanisms to Practical Use

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