Online monitoring of alloyed bimetallic nanoparticle formation by optical spectroscopy

Belotelov, V. I.; Carotenuto, G.; Nicolais, L.; Longo, Angela; Pepe, Giovanni Piero; Perlo, Pietro; Zvezdin, A. K.

doi:10.1063/1.2172722

Cited by 35 publications

(39 citation statements)

References 43 publications

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“…Therefore, interband contributions into their dielectric functions must be taken into account at certain wavelengths. To account for bimetallic structures, the dielectric function used is a weighted linear combination of dielectric constants of the constituent metals [27].…”

Section: Influence Of Bimetallic Nanoparticles On Improving Plasmonicmentioning

confidence: 99%

Recent Advances in the Synthesis of Plasmonic Bimetallic Nanoparticles

2009

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The importance of plasmonic nanoparticles in sensor development, imaging, photodiagnostics, and optoelectronics has resulted in a strong interest toward the development of straightforward synthetic methods for their preparation. In this article, we review some of the most significant advances that have been made in the synthesis of plasmonic bimetallic nanoparticles. Approaches to control morphology, with an emphasis on reactions that produce uniform particles with well-defined sizes and shapes and in high yields, are described. In addition, several characterization techniques that have been employed to elucidate the morphology of the particles are illustrated.

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Section: Influence Of Bimetallic Nanoparticles On Improving Plasmonicmentioning

confidence: 99%

Recent Advances in the Synthesis of Plasmonic Bimetallic Nanoparticles

2009

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“…For gold and silver, the Fermi velocity gets almost the same 49 which is actually used to consider some of the other factors like electron density at the surface. Therefore, the differences between the dielectric functions of nanoparticles and bulk metals are included in the free electron part of the dielectric function.…”

Section: Discussionmentioning

confidence: 99%

“…Silver and gold have close bulk plasma frequencies: hx P ¼ 8:5 eV for silver and hx P ¼ 9:0 eV for gold, and h is the reduced Planck constant. 49,51 As the particle size reduces, the rate of scattering from the particle surface c s becomes larger than the bulk scattering c 0 , and the following relation can be obtained:…”

Section: Discussionmentioning

confidence: 99%

“…It is generally accepted that a good approximation of the dielectric function of small particles is obtained from the bulk dielectric function, considering the contributions of the interband contributions. 49,50 Consequently, the dielectric function is written as…”

Section: Discussionmentioning

confidence: 99%

“…The bimetallic nanoparticle dielectric function is assumed to be a weighted linear combination of dielectric functions for single particles. It can be calculated in terms of the dielectric functions e Ag and e Au for nanoparticles of the same size consisting of the pure metals 24,49 e Alloy ¼ ae Ag þ ð1 À aÞe Au ;…”

Section: Discussionmentioning

confidence: 99%

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Ion irradiation synthesis of Ag–Au bimetallic nanospheroids in SiO2 glass substrate with tunable surface plasmon resonance frequency

Meng

Shibayama

et al. 2013

Journal of Applied Physics

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Ag-Au bimetallic nanospheroids with tunable localized surface plasmon resonance (LSPR) were synthesized by 100 keV Ar-ion irradiation of 30 nm Ag-Au bimetallic films deposited on SiO 2 glass substrates. A shift of the LSPR peaks toward shorter wavelengths was observed up to an irradiation fluence of 1.0 Â 10 17 cm À2, and then shifted toward the longer wavelength because of the increase of fragment volume under ion irradiation. Further control of LSPR frequency over a wider range was realized by modifying the chemical components. The resulting LSPR frequencies lie between that of the pure components, and an approximate linear shift of the LSPR toward the longer wavelength with the Au concentration was achieved, which is in good agreement with the theoretical calculations based on Gans theory. In addition, the surface morphology and compositions were examined with a scanning electron microscope equipped with an energy dispersive spectrometer, and microstructural characterizations were performed using a transmission electron microscope. The formation of isolated photosensitive Ag-Au nanospheroids with a FCC structure partially embedded in the SiO 2 substrate was confirmed, which has a potential application in solid-state devices. V C 2013 AIP Publishing LLC. [http://dx

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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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Online monitoring of alloyed bimetallic nanoparticle formation by optical spectroscopy

Cited by 35 publications

References 43 publications

Recent Advances in the Synthesis of Plasmonic Bimetallic Nanoparticles

Recent Advances in the Synthesis of Plasmonic Bimetallic Nanoparticles

Ion irradiation synthesis of Ag–Au bimetallic nanospheroids in SiO2 glass substrate with tunable surface plasmon resonance frequency

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

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