The equilibrium orientation relationship between Pt and SrTiO3 and its implication on Pt films deposited by physical vapor phase deposition

Altberg, Anna; Atiya, Galit; Mikhelashvili, V.; Eisenstein, G.; Kaplan, Wayne D.

doi:10.1007/s10853-013-7941-1

Cited by 6 publications

(2 citation statements)

References 56 publications

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“…The solid-state dewetting is mainly induced by the atomic diffusion and is driven by the total surface and interface energy minimization . Various growth parameters such as the initial film thickness, annealing temperature, duration, and film and substrate properties affect the dewetting kinetics and the surface morphology of resulting nanostructures. − Moreover, in the case of a metallic bilayer, due to the difference in diffusivity, melting points, interdiffusion, and surface and interface energies of constituent metals, the dewetting characteristic can become more complicated. This may also provide opportunities to generate varieties of surface nanostructures.…”

Section: Resultsmentioning

confidence: 99%

Plasmonic Pt Nanocrystals by Using a Sacrificial In Component via the Enhanced Dewetting on Sapphire (0001): Improvement on Morphological and Localized Surface Plasmon Resonance Properties

et al. 2018

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Modulation of functional metallic nanoparticles (NPs) in terms of their size, configuration, and dimension can offer a promising route to control the optical, catalytic, magnetic, and sensing properties for a wide range of applications. Herein, the platinum (Pt) nanostructures of improved morphological and localized surface plasmon resonance properties are demonstrated via the enhanced solid-state dewetting by using a sacrificial indium (In) layer on sapphire (0001). Upon annealing, the concurrent occurrence of intermixing between In and Pt atoms, formation of In–Pt alloy and sublimation of In atoms plays major roles in accelerating the dewetting process, which results in the formation of definite Pt nanostructures. The alteration in the In and Pt ratio readily varies the shape, size, and areal density of the resulting Pt NPs. The optical characteristics reveal that the localized surface plasmon resonance (LSPR) response is sensitively affected by the resulting surface morphology of Pt NPs. Specifically, the LSPR peak is dynamically tunable in the visible region over the range of wavelength 450 nm < λ < 520 nm on the basis of the variation of the surface morphologies of Pt NPs. In contrast to the conventional dewetting of pure Pt films, this approach signifies the advantages such as improved configuration, uniformity, and isolation of Pt NPs under similar growth conditions. The growth characteristics and structures of the resulting Pt NPs are discussed on the basis of the enhanced diffusion, energy minimization, and equilibrium configuration mechanism.

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Section: Resultsmentioning

confidence: 99%

Plasmonic Pt Nanocrystals by Using a Sacrificial In Component via the Enhanced Dewetting on Sapphire (0001): Improvement on Morphological and Localized Surface Plasmon Resonance Properties

et al. 2018

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“…The formation of core–shell nanocubes using Pd and Pt seeds indicates that the nanocube growth mode is able to withstand lattice mismatches between the core and shell which are as high as 4.8%. The growth mode is also able to accommodate the intricate seed geometries displayed by Pt and Pd which deviate from the equilibrium shape (i.e., the truncated octahedron) in that there are additional high‐index facets . The ability to form structures using Ag seeds demonstrates that this growth mode is amenable to homoepitaxial depositions capable of modifying the shape of the structure as it grows.…”

Section: Resultsmentioning

confidence: 99%

Citrate‐Induced Nanocubes: A Re‐Examination of the Role of Citrate as a Shape‐Directing Capping Agent for Ag‐Based Nanostructures

Hajfathalian

Gilroy

Hughes

et al. 2016

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Seed-mediated syntheses utilizing facet-selective surface passivation provide the necessary chemical controls to direct noble metal nanostructure formation to a predetermined geometry. The foremost protocol for the synthesis of (111)-faceted Ag octahedra involves the reduction of metal ions onto pre-existing seeds in the presence of citrate and ascorbic acid. It is generally accepted that the capping of (111) facets with citrate dictates the shape while ascorbic acid acts solely as the reducing agent. Herein, a citrate-based synthesis is demonstrated in which the presence or absence of ascorbic acid is the shape-determining factor. Reactions are carried out in which Ag(+) ions are reduced onto substrate-immobilized Ag, Au, Pd, and Pt seeds. Syntheses lacking ascorbic acid, in which citrate acts as both the capping and the reducing agent, result in a robust nanocube growth mode able to withstand wide variations in the concentration of reactants, reaction rates, seed material, seed orientation and faceting, pH, and substrate material. If, however, ascorbic acid is included in these syntheses, then the growth mode reverts to one that advances the octahedral geometry. The implication of these results is that citrate, or one of its oxidation products, selectively caps (100) facets, but where this capability is compromised by ascorbic acid.

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Solid-state dewetting of Pt on (100) SrTiO3

et al. 2014

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The equilibrium orientation relationship between Pt and SrTiO3 and its implication on Pt films deposited by physical vapor phase deposition

Cited by 6 publications

References 56 publications

Plasmonic Pt Nanocrystals by Using a Sacrificial In Component via the Enhanced Dewetting on Sapphire (0001): Improvement on Morphological and Localized Surface Plasmon Resonance Properties

Plasmonic Pt Nanocrystals by Using a Sacrificial In Component via the Enhanced Dewetting on Sapphire (0001): Improvement on Morphological and Localized Surface Plasmon Resonance Properties

Citrate‐Induced Nanocubes: A Re‐Examination of the Role of Citrate as a Shape‐Directing Capping Agent for Ag‐Based Nanostructures

Solid-state dewetting of Pt on (100) SrTiO3

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