Modeling of formation mechanism and optical properties of Si/Au core-shell nanoparticles

Zograf, George; Rybin, Mikhail V.; Zuev, Dmitry; Makarov, Sergey; Belov, Pavel A.; Lopanitsyna, N Yu; Kuksin, A. Yu.; Starikov, Sergey N.

doi:10.1109/dd.2016.7756894

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…Emergent properties have been argued to originate from the synergistic effects arising from coupling of metal and semiconductor components. , For example, the metal component can enhance light absorption of the semiconductor through the localized surface plasmon resonance in photocatalytic applications . Au–Si hybrid nanostructures exhibit better properties compared to pure Au nanorods for localized surface-plasmon resonance applications, localized heating, optical properties, and mechanical properties . In addition, Si-coated Au nanorod arrays are promising candidates for infrared detectors, sensors, subtractive filters and modulators, and hot electron generator applications .…”

Section: Introductionmentioning

confidence: 99%

Nanomolding of Gold and Gold–Silicon Heterostructures at Room Temperature

Raj

Liu

et al. 2021

ACS Nano

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Nanofabrication techniques are limited by at least one of the required characteristics such as choice of material, control over geometry, fabrication requirements, yield, cost, and scalability. Our previously developed method of thermomechanical nanomolding fulfills these requirements, although it requires high processing temperatures. Here, we demonstrate low-temperature molding where we utilize the enhanced diffusivity on "eutectic interfaces". Gold nanorods are molded at room temperature using Au−Si alloy as feedstock. Instead of using alloy feedstock, these "eutectic interfaces" can also be established through a feedstock−mold combination. We demonstrate this by using pure Au as feedstock, which is molded into Si molds at room temperature, and also the reverse, Si feedstock is molded into Au molds forming high aspect ratio Au−Si core−shell nanorods. We discuss the mechanism of this low-temperature nanomolding in terms of lower homologous temperature at the eutectic interface. This technique, based on enhanced eutectic interface diffusion, provides a practical nanofabrication method that eliminates the previous high-temperature requirements, thereby expanding the range of the materials that can be practically nanofabricated.

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Section: Introductionmentioning

confidence: 99%

Nanomolding of Gold and Gold–Silicon Heterostructures at Room Temperature

Raj

Liu

et al. 2021

ACS Nano

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“…The structure of these nanoparticles is primarily determined by the methods and conditions of synthesis, which should allow us to combine the two materials even if they are immiscible in the bulk state. In addition to chemical techniques [9][10][11][12], physical methods such as gas-phase methods [5,6,15], laser ablation [7,8,16], and magnetron-sputter gas-phase condensation [17] have been developed. When these methods are combined with the possibility of rapid heating and evaporation of both materials and the possibility of rapid controlled cooling of the resulting vapour mixture, the formation of nanoparticles with a complex structure is possible.…”

Section: Introductionmentioning

confidence: 99%

“…In [17], the simulation of the formation of the Si/Au core-shell nanoparticles obtained from two liquid drops of gold and silicon was presented. Additionally, the authors, using the Mie scattering theory, investigated the optical response of the obtained Si/Au nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Formation of metal/semiconductor Cu–Si composite nanostructures

Yumozhapova

Nomoev

Сызранцев

et al. 2019

Beilstein J. Nanotechnol.

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Molecular dynamics modelling of the formation of copper and silicon composite nanostructures was carried out by using the many-particle potential method. The dependences of the internal structure on the cooling rate and the ratio of elements were investigated. The possibility of the formation of the Cu–Si nanoparticles from both a homogeneous alloy and two initial drops at short distance were shown. A comparative analysis showed that the diameter distribution of copper and silicon atoms in experimental particles coincides with the simulation results with silicon content of 50 atom %. Additionally, an estimation of the effective experimental cooling rate was made.

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“…However, simulation studies to obtain a comprehensive understanding of this phenomenon is still lacking. Several studies [4,5,6] have been conducted which discusse the modeling of the formation mechanism of core-shell nanoparticles. Molecular dynamics simulations indicate that the individual species first form independent clusters of Si and Ag without significant intermixing.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the deposition conditions, Janus and core−shell structures are produced [4]. The authors [5] proposed a principle of formation of a core-shell nanoparticle made of liquid silicon and gold droplets. However, simulations of the formation of core-shell nanoparticles Cu@Si indicate that the atomic vapor forms only alloy particles at homogeneous condensation [6].…”

Section: Introductionmentioning

confidence: 99%

Computer Modeling of the Formation Process of Core-Shell Nanoparticles Cu@Si

Yumozhapova

Nomoev

Gafner

2018

SSP

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The process of nanoparticle Cu@Si formation by the molecular dynamic method using MEAM-potentials was studied. Modeling the droplet behavior demonstrates that a core-shell structure with a copper core and a silicon shell can be formed if the drop is in the liquid state, until the material is finally redistributed. The parameters of thermal stability of Cu@Si composite nanoparticles of different sizes have been determined. It is concluded that as the temperature increases, the diffusion of copper atoms to the surface begins, which leads to a change in the structure and the formation of particles with a core of the Cu@Si type.

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Modeling of formation mechanism and optical properties of Si/Au core-shell nanoparticles

Cited by 3 publications

References 9 publications

Nanomolding of Gold and Gold–Silicon Heterostructures at Room Temperature

Nanomolding of Gold and Gold–Silicon Heterostructures at Room Temperature

Formation of metal/semiconductor Cu–Si composite nanostructures

Computer Modeling of the Formation Process of Core-Shell Nanoparticles Cu@Si

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