Structural and magnetic investigations on metastable Ag–Fe nanophase alloy

Santhi, K.; Thirumal, E.; Karthick, S.; Kim, Hee-Je; Narayanan, Vijaykrishnan

doi:10.1016/j.jallcom.2012.12.161

Cited by 17 publications

(6 citation statements)

References 42 publications

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“…53 The magnetic properties of composite nanoparticles among noble metals and magnetic metals have been widely investigated during the past few decades. [194][195][196][197][198][199][200] Investigations on the magnetic properties of Fe-Ag composite nanoparticles with different ratios of Fe and Ag, including Fe 90 Ag 10 , 197,201 Fe 75 Ag 25 , 197,202 Fe 55 Ag 45 , 203 Fe 50 Ag 50 , 197 Fe 35 Ag 65 , 204 and Fe 25 Ag 75 , 197,204 suggest that the magnetic properties of composite nanoparticles are strongly dependent on the interactions between the different elements as well as structural arrangement (Fig. 9).…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Recent advances in noble metal based composite nanocatalysts: colloidal synthesis, properties, and catalytic applications

et al. 2015

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This Review article provides a report on progress in the synthesis, properties and catalytic applications of noble metal based composite nanomaterials. We begin with a brief discussion on the categories of various composite materials. We then present some important colloidal synthetic approaches to the composite nanostructures; here, major attention has been paid to bimetallic nanoparticles. We also introduce some important physiochemical properties that are beneficial from composite nanomaterials. Finally, we highlight the catalytic applications of such composite nanoparticles and conclude with remarks on prospective future directions.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Recent advances in noble metal based composite nanocatalysts: colloidal synthesis, properties, and catalytic applications

et al. 2015

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“…[34] Thus, some solid-solution alloys consisting of two bulk immiscible metals have been obtained at the nanoscale, e.g. Fe–Ag[35] and Ag–Rh [36] alloy NPs. These newly obtained nanostructures may show novel properties that are not exhibited in the bulk phase.…”

Section: Introductionmentioning

confidence: 99%

Recent progress in the structure control of Pd–Ru bimetallic nanomaterials

Kusada

Kitagawa

2016

Science and Technology of Advanced Materials

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Pd and Ru are two key elements of the platinum-group metals that are invaluable to areas such as catalysis and energy storage/transfer. To maximize the potential of the Pd and Ru elements, significant effort has been devoted to synthesizing Pd–Ru bimetallic materials. However, most of the reports dealing with this subject describe phase-separated structures such as near-surface alloys and physical mixtures of monometallic nanoparticles (NPs). Pd–Ru alloys with homogenous structure and arbitrary metallic ratio are highly desired for basic scientific research and commercial material design. In the past several years, with the development of nanoscience, Pd–Ru bimetallic alloys with different architectures including heterostructure, core-shell structure and solid-solution alloy were successfully synthesized. In particular, we have now reached the stage of being able to obtain Pd–Ru solid-solution alloy NPs over the whole composition range. These Pd–Ru bimetallic alloys are better catalysts than their parent metal NPs in many catalytic reactions, because the electronic structures of Pd and Ru are modified by alloying. In this review, we describe the recent development in the structure control of Pd–Ru bimetallic nanomaterials. Aiming for a better understanding of the synthesis strategies, some fundamental details including fabrication methods and formation mechanisms are discussed. We stress that the modification of electronic structure, originating from different nanoscale geometry and chemical composition, profoundly affects material properties. Finally, we discuss open issues in this field.

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“…In order to take advantage of the properties of alloyed NPs, the key factor is their preparation, which should facilitate the effective control of their composition. During the last few years, several methods have been developed for the synthesis of alloyed NPs, as for example pulsed electrodeposition, 13 chemical reduction method, 14 evaporation of metallic bulk solid solutions, 15 sol−gel, 16 molecular beam epitaxy, 17 biogenic synthesis, 18 microreaction, 19 digestive ripening, 20 and different laser ablation based approaches. 21 Among the various preparation techniques, laser ablation in liquids has been demonstrated as the most efficient and flexible and prevailed almost all other preparation techniques of NPs.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys

et al. 2015

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The synthesis of variable composition Au x Ag (1−x) alloyed nanoparticles prepared by laser ablation in water is reported. The nanoalloys exhibited a single characteristic surface plasmon resonance peak, whose spectral position was lying between the surface plasmon resonance peaks of neat Ag and Au nanoparticles, at about 400 and 530 nm respectively, depending directly on the composition of the alloyed nanoparticles. The nonlinear optical response of the nanoalloys was studied in details under 532 nm (visible) 35 ps and 4 ns laser excitation and it was found to be significant and greatly influenced by the position of the plasmonic band relative to the laser excitation wavelength. In this respect, increase of the Au molar fraction resulted in shifting of the nanoalloy plasmon band toward the location of the plasmon band of neat Au nanoparticles, i.e., at about 530 nm, closer to the laser excitation wavelength, hence causing more efficient resonance enhancement of the nonlinear optical response. Moreover, the nanoalloys were found to exhibit strong saturable absorption behavior when excited by ps or ns pulses, in the latter case this behavior changing to reverse saturable absorption at high laser intensity. The origin, the magnitude and the sign of the observed optical nonlinearities of the alloyed nanoparticles are explained and discussed in terms of the hot-electron and the interband contributions taking place under laser excitation in such nanostructures. The possibility of controlling the magnitude and the sign of the nonlinear optical response of Au x Ag (1−x) nanoalloys through their composition provides an attractive and efficient way to tailor the optical nonlinearities of noble metal nanoalloys, making them very useful for various emerging photonic, biophotonic, and optoelectronic applications.

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Structural and magnetic investigations on metastable Ag–Fe nanophase alloy

Cited by 17 publications

References 42 publications

Recent advances in noble metal based composite nanocatalysts: colloidal synthesis, properties, and catalytic applications

Recent advances in noble metal based composite nanocatalysts: colloidal synthesis, properties, and catalytic applications

Recent progress in the structure control of Pd–Ru bimetallic nanomaterials

Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys

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Structural and magnetic investigations on metastable Ag–Fe nanophase alloy

Cited by 17 publications

References 42 publications

Recent advances in noble metal based composite nanocatalysts: colloidal synthesis, properties, and catalytic applications

Recent advances in noble metal based composite nanocatalysts: colloidal synthesis, properties, and catalytic applications

Recent progress in the structure control of Pd–Ru bimetallic nanomaterials

Effect of the Composition on the Nonlinear Optical Response of AuxAg1–x Nano-Alloys

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Effect of the Composition on the Nonlinear Optical Response of Au_xAg_1–x Nano-Alloys