Synthesis of platinum-based binary and ternary alloy nanoparticles in an intense laser field

Herbani, Yuliati; Nakamura, Takahiro; Sato, Shunichi

doi:10.1016/j.jcis.2012.02.030

Cited by 37 publications

(37 citation statements)

References 25 publications

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“…The previously proposed mechanism of radical-mediated nucleation [26][27][28]34 has been shown to exhibit zeroth-order kinetics with respect to [AuCl 4 ] − under acidic conditions due to the limited production of reactive radical species from water photolysis. The additional…”

Section: ■ Conclusionmentioning

confidence: 99%

Elucidating Strong Field Photochemical Reduction Mechanisms of Aqueous [AuCl₄]⁻: Kinetics of Multiphoton Photolysis and Radical-Mediated Reduction

et al. 2016

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Direct, multiphoton photolysis of aqueous metal complexes is found to play an important role in the formation of nanoparticles in solution by ultrafast laser irradiation. In situ absorption spectroscopy of aqueous [AuCl4](-) reveals two mechanisms of Au(0) nucleation: (1) direct multiphoton photolysis of [AuCl4](-) and (2) radical-mediated reduction of [AuCl4](-) upon multiphoton photolysis of water. Measurement of the reaction kinetics as a function of solution pH reveals zeroth-, first-, and second-order components. The radical-mediated process is found to be zeroth-order in [AuCl4](-) under acidic conditions, where the reaction rate is limited by the production of reactive radical species from water during each laser shot. Multiphoton photolysis is found to be first order in [AuCl4](-) at all pHs, whereas the autocatalytic reaction with H2O2, the photolytic reaction product of water, is second order.

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Section: ■ Conclusionmentioning

confidence: 99%

Elucidating Strong Field Photochemical Reduction Mechanisms of Aqueous [AuCl₄]⁻: Kinetics of Multiphoton Photolysis and Radical-Mediated Reduction

et al. 2016

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“…Since the atoms/ions/clusters are first generated from the ablated targets due to plasma‐caused material atomization and ionization under extreme conditions (temperatures up to 7000 K and pressures larger than 10 7 Pa), they can easily react either with each other (AgGe binary target, for example) or react with active species (e.g., ions, radicals, solvated electrons) from liquid ionization/decomposition. Hence, despite some reports on stoichiometric synthesis of noble metal alloy nanoparticles (e.g., AgAu) via LAL, one big challenge in LAL is the precise control of the composition of alloy particles from alloy targets, especially in an oxidizing environment.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Zhang

Spasova

et al. 2017

Part. Part. Syst. Charact.

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Laser ablation in liquids (LAL) has emerged as a versatile approach for the synthesis of alloy particles and oxide nanomaterials. However, complex chemical reactions often take place during synthesis due to inevitable atomization and ionization of the target materials and decomposition/hydrolysis of solvent/solution molecules, making it difficult to understand the particle formation mechanisms. In this paper, a possible route for the formation of FeMn alloy nanoparticles as well as MnOx nanoparticles, ‐sheets, and ‐fibers by LAL is presented. The observed structural, compositional, and morphological variations are clarified by transmission electron microscopy (TEM). The studies suggest that a reaction between Mn atoms and Fe ions followed by surface oxidation result in nonstoichiometric synthesis of Fe‐rich FeMn@FeMn2O4 core–shell alloy particles. Interestingly, a phase transformation from Mn3O4 to Mn2O3 and finally to Ramsdellite γ‐MnO2 is accompanied by a morphology change from nanosheets to nanofibers in gradually increasing oxidizing environments. High‐resolution TEM images reveal that the particle‐attachment mechanism dominates the growth of different manganese oxides.

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“…On the contrary, it is reported that electronic structures of these elements in a nanometer-sized particle retain, and therefore nanometersized particles have a favor to form homogeneous alloys and no rehybridization occurs due to band formation. 15 We have demonstrated binary Au-Ag, Au-Pt, Rh-Pd, and Rh-Pt, and ternary Au-Ag-Pt [16][17][18][19] NPs formation with fully tunable compositions by femtosecond laser irradiation of mixed ion solutions. In the case of tightly focused femtosecond laser irradiation in a solution, nonlinear optical processes such as multiphoton absorption and avalanche ionization can take place due to high photon density of strongly focused beam in a condensed matter.…”

Section: Introductionmentioning

confidence: 97%

Composition-controlled ternary Rh–Pd–Pt solid-solution alloy nanoparticles by laser irradiation of mixed solution of metallic ions

2014

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We present a bottom-up fabrication route to fabricate solid-solution Rh-Pd-Pt ternary alloy nanoparticles (NPs), with well-controlled compositions through femtosecond laser irradiation of a mixed solution of metallic ions, without any reducing agents and complicated processes. The structure of fabricated NPs was crystalline, and formation of solid-solution alloy formation was confirmed by electron and x-ray diffraction measurements. The crystalline nature of alloy NPs was also confirmed through high-resolution transmission electron microscope measurement. According to energy dispersive spectroscopy analysis, elemental composition of an individual NP was almost the same as the initial feeding ratio of ions in the mixed solutions. The electronic state of the element in alloy NPs was confirmed to be pure metal by XPS measurement. The structural studies of Rh-Pd-Pt NPs suggested that the demonstrated technique opens up a new dimension for the fabrication of NPs, which has well-controlled properties for practical use in various fields.

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Synthesis of platinum-based binary and ternary alloy nanoparticles in an intense laser field

Cited by 37 publications

References 25 publications

Elucidating Strong Field Photochemical Reduction Mechanisms of Aqueous [AuCl₄]⁻: Kinetics of Multiphoton Photolysis and Radical-Mediated Reduction

Elucidating Strong Field Photochemical Reduction Mechanisms of Aqueous [AuCl₄]⁻: Kinetics of Multiphoton Photolysis and Radical-Mediated Reduction

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Composition-controlled ternary Rh–Pd–Pt solid-solution alloy nanoparticles by laser irradiation of mixed solution of metallic ions

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Synthesis of platinum-based binary and ternary alloy nanoparticles in an intense laser field

Cited by 37 publications

References 25 publications

Elucidating Strong Field Photochemical Reduction Mechanisms of Aqueous [AuCl4]−: Kinetics of Multiphoton Photolysis and Radical-Mediated Reduction

Elucidating Strong Field Photochemical Reduction Mechanisms of Aqueous [AuCl4]−: Kinetics of Multiphoton Photolysis and Radical-Mediated Reduction

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Composition-controlled ternary Rh–Pd–Pt solid-solution alloy nanoparticles by laser irradiation of mixed solution of metallic ions

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Elucidating Strong Field Photochemical Reduction Mechanisms of Aqueous [AuCl₄]⁻: Kinetics of Multiphoton Photolysis and Radical-Mediated Reduction

Elucidating Strong Field Photochemical Reduction Mechanisms of Aqueous [AuCl₄]⁻: Kinetics of Multiphoton Photolysis and Radical-Mediated Reduction