AuFePt Ternary Homogeneous Alloy Nanoparticles with Magnetic and Plasmonic Properties

Mohan, Priyank; Takahashi, Mari; Higashimine, Koichi; Mott, Derrick; Maenosono, Shinya

doi:10.1021/acs.langmuir.6b04363

Cited by 16 publications

(16 citation statements)

References 41 publications

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“…These results confirm that the AuNPs exhibit covered Pt-layers with different shell thickness which shields the Au LSPR peak. This effect is reasonable because of the damping effect caused by Pt-shells, which is in line with the previous studies [36,37]. Furthermore, the structure and composition of the Au@Pt core–shell NPs were examined using parallel-beam X-ray diffraction (XRD) analysis.…”

Section: Resultssupporting

confidence: 86%

Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation

et al. 2019

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Bimetallic Au@Pt nanoparticles (NPs) with Pt monolayer shell are of much interest for applications in heterogeneous catalysts because of enhanced catalytic activity and very low Pt-utilization. However, precisely controlled synthesis with uniform Pt-monolayers and stability on the AuNPs seeds remain elusive. Herein, we report the controlled deposition of Pt-monolayer onto uniform AuNPs seeds to obtain Au@Pt core–shell NPs and their Pt-coverage dependent electrocatalytic activity for methanol electro-oxidation. The atomic ratio between Au/Pt was effectively tuned by varying the precursor solution ratio in the reaction solution. The morphology and atomic structure of the Au@Pt NPs were analyzed by high-resolution scanning transmission electron microcopy (HR-STEM) and X-ray diffraction (XRD) techniques. The results demonstrated that the Au@Pt core–shell NPs with Pt-shell thickness (atomic ratio 1:2) exhibit higher electrocatalytic activity for methanol electro-oxidation reaction, whereas higher and lower Pt ratios showed less overall catalytic performance. Such higher catalytic performance of Au@Pt NPs (1:2) can be attributed to the weakened CO binding on the Pt/monolayers surface. Our present synthesis strategy and optimization of the catalytic activity of Au@Pt core–shell NPs catalysts provide promising approach to rationally design highly active catalysts with less Pt-usage for high performance electrocatalysts for applications in fuel cells.

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Section: Resultssupporting

confidence: 86%

Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation

et al. 2019

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“…Although the plasmonic features are changed, the superparamagnetic nature of Fe in this alloy is largely retained. [58] Beyond binary mixtures, multielement alloys can potentially provide even finer control of the overall optical properties as more variables (multielement ratios) are accessible for tuning. As an example, Nugroho et al [3] have demonstrated ternary Au-Ag-Pd nanodisks with the extinction spectrum dominated by Pd despite the equal content of all elements.…”

Section: Optical Extinction Spectramentioning

confidence: 99%

“…Although the plasmonic features are changed, the superparamagnetic nature of Fe in this alloy is largely retained. [ 58 ]…”

Section: Optical Properties Of Metal Alloysmentioning

confidence: 99%

Emergent Opportunities with Metallic Alloys: From Material Design to Optical Devices

Gong

Lyu

Palm

et al. 2020

Advanced Optical Materials

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devices is the fact that their dielectric function (i.e., permittivity, ε = ε 1 + iε 2) is predefined. Thus, several research groups, including ours, have recently merged two almost orthogonal fields, photo nics, and metallurgy, to pursue metallic materials with arbitrary permit tivity. [1-5] Alloying is now a burgeoning framework for achieving materials with engineered optical properties, encom passing both nanostructures and thin films, as will be surveyed in this Review. Plasmonics exploits the interaction of incident electromagnetic fields with the col lective motion of free electrons (plasmons) in metals. This phenomenon confines the electromagnetic fields in close vicinity of the metal interfaces, dramatically enhancing the electrical field intensity surrounding the material. [6-8] Plasmons can be divided into two categories: surface plasmon polaritons (SPP) that propagate along the metal and dielectric interface, and localized surface plasmon resonance (LSPR) that are confined in a subwavelength nanostructure. For the latter, their optical scattering or absorp tion (and/or the nearby dielectrics and semiconductors) can be significantly increased. As a result, these enhancement effects are the underpinnings to a range of novel optical processes, and have found countless applications in photovoltaics, [9-11] photo catalysis, [12-14] bio and chemicalsensing, [15,16] electrooptical modu lation, [17,18] and superabsorbers. [19-21] As expected, the features of either type of plasmon are strongly dependent upon the dielectric function of the material, which is somewhat fixed in metals. Concerning materials, coinage metals, such as Au, Ag, or Cu, are widely used in photonics due to their abundant free electrons and chemical stability. [1] Other noble metals including Metallic nanostructures and thin films are fundamental building blocks for next-generation nanophotonics. Yet, the fixed permittivity of pure metals often imposes limitations on the materials employed and/or on device performance. Alternatively, metallic mixtures, or alloys, represent a promising pathway to tailor the optical and electrical properties of devices, enabling further control of the electromagnetic spectrum. In this Review, a survey of recent advances in photonics and plasmonics achieved using metal alloys is presented. An overview of the primary fabrication methods to obtain subwavelength alloyed nanostructures is provided, followed by an in-depth analysis of experimental and theoretical studies of their optical properties, including their correlation with band structure. The broad landscape of optical devices that can benefit from metallic materials with engineered permittivity is also discussed, spanning from superabsorbers and hydrogen sensors to photovoltaics and hot electron devices. This Review concludes with an outlook of potential research directions that would benefit from the on demand optical properties of metallic mixtures, leading to new optoelectronic materials and device opportunities.

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“…48 There are no signicant SPR peak shis in the case of Ag@Pt, Ag@Pt, and Ag@PtPd core-shell nanoplates which is mainly due the damping effect caused by the imaginary part of Pt/Pd dielectric function. 49,50 The pH of the reaction system is the key to controlling the galvanic replacement and selective formation of core-shell nanoplates. To clearly elucidate this effect, we performed further control experiments at a relatively low pH (pH ¼ 4) by adding a certain amount of 0.2 M of HCl, that resulted in well-dened bimetallic AgM (Au, Pd, and Pt) hollow nanoframes (Fig.…”

Section: Synthesis Of Bimetallic/multimetallic Agm (M ¼ Pt and Pd) Comentioning

confidence: 99%

A general seed-mediated approach to the synthesis of AgM (M = Au, Pt, and Pd) core–shell nanoplates and their SERS properties

et al. 2017

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AuFePt Ternary Homogeneous Alloy Nanoparticles with Magnetic and Plasmonic Properties

Cited by 16 publications

References 41 publications

Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation

Synthesis of Au@Pt Core—Shell Nanoparticles as Efficient Electrocatalyst for Methanol Electro-Oxidation

Emergent Opportunities with Metallic Alloys: From Material Design to Optical Devices

A general seed-mediated approach to the synthesis of AgM (M = Au, Pt, and Pd) core–shell nanoplates and their SERS properties

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