Dielectric Function of Gold Nanoparticles Synthesized Using Camellia sinensis Extract

Melo, Arthur A.; Rodrigues, Eloise P.; Vasconcelos, J. S.; Medeiros, Eliton S.; Oliveira, Leiva Casemiro; Lima, Antonio Marcus Nogueira

doi:10.1007/s11468-022-01776-8

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…εð1Þ: is a high optical dielectric constant; its value for free electron gas is 1, for metal is from 1 to 10 [113], and Au is 1.53 [119,120]. The total dielectric function of free electrons as a function of angular frequency is written as for free electron gas [92,113], where γ free is the damping constant of the oscillators of free electrons and ω 0 ≈ 0:…”

Section: Mathematical Formulation Of Size-dependent Dielectricmentioning

confidence: 99%

“…Many researchers have studied the optical properties and size-dependent dielectric function of Au nanoparticles in experimental and theoretical ways [90][91][92][93]. We are listing some of them below: In experimentally used spectroscopic ellipsometry, which measured the polarization of electromagnetic radiation, which is reflected from gold nanomaterials, and in differential interference contrast microscopy, they measured the real and imaginary parts of the dielectric function of gold nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

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Computational Study of the Effect of the Size-Dependent Dielectric Functions of Gold Nanomaterials on Optical Properties

Mekuye,

Höfer,

Mebratie

2024

Advances in Condensed Matter Physics

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The effect of size on the optical properties of gold nanomaterials has been studied using the theoretical Drude–Sommerfield model. The real and imaginary parts of the dielectric function of bulk as a function of wavelength due to free electron contribution and the real and imaginary parts of the dielectric function of nanogold materials as a function of wavelength due to free electron and bond electron contribution are calculated. The real and imaginary parts of the dielectric function of bulk as a function of wavelength due to the free electron contribution graph and The real and imaginary parts of the dielectric function of nanogold materials as a function of wavelength due to free electron and bond electron contributions are plotted. As we observed from the graphs, the real dielectric functions of both bulk and nanogold materials are inversely proportional to wavelength. The imaginary part of the dielectric function of bulk gold materials is independent of wavelength. At high wavelengths, the size of the gold nanomaterial is highly influenced by both real and imagined dielectric functions at high waves. As the wavelength increases, the effect of the size on the dielectric function also increases. The size-dependent dielectric function of nanomaterials is highly influenced by their optical properties and electrical structure.

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Section: Mathematical Formulation Of Size-dependent Dielectricmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Study of the Effect of the Size-Dependent Dielectric Functions of Gold Nanomaterials on Optical Properties

Mekuye,

Höfer,

Mebratie

2024

Advances in Condensed Matter Physics

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Microwave assisted production and characterization of gold nanoparticles using green tea and catechin extracts obtained by supercritical extraction method

Serdar

Kılınç

2023

Chem. Pap.

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A novel simulador for agile and graphical modeling of surface plasmon resonance based sensors

Gomes,

Oliveira

2023

Sci Rep

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Surface plasmon resonance (SPR) sensor is a consolidated technology for analysis of biomolecular interaction, largely applied in biology and pharmaceutical research. The simulation of the surface plasmon optical excitation response is an important step in the development process of SPR based sensors. The structure, design and configuration of the desired sensor benefits from a previous simulated analyses of the generated responses, defining operational conditions and feasibility of the selected materials to composed the optical coupling layers. Here an online web-based SPR sensor’s simulator is presented. With a visual-oriented interface, enable drag & drop actions to easily and quickly model a variety of sensor arrangements. Presenting an embedded materials database for metals, glasses, 2D materials, nanoparticles, polymers, and custom substances, the simulator enables flexible configuration for sensors operating in angular and spectral modes, as well as localized SPR. The light propagation through the multilayer of materials is presented in terms of Fresnel coefficients, which are graphically displayed. The so-called SPR morphology parameters can be visualized. Moreover, sensor dynamic behavior could be knowledge by a Sensorgram simulation. Localized surface plasmon resonance (LSPR) in homogeneous and spherical nanoparticles is also present in the simulator. Simulated scenario’s in various configurations, designs and excitation were performed and compare with other simulator. The proposed simulator guarantees comparable results with low-code, agile, and intuitive flow of execution.

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Dielectric Function of Gold Nanoparticles Synthesized Using Camellia sinensis Extract

Cited by 3 publications

References 23 publications

Computational Study of the Effect of the Size-Dependent Dielectric Functions of Gold Nanomaterials on Optical Properties

Computational Study of the Effect of the Size-Dependent Dielectric Functions of Gold Nanomaterials on Optical Properties

Microwave assisted production and characterization of gold nanoparticles using green tea and catechin extracts obtained by supercritical extraction method

A novel simulador for agile and graphical modeling of surface plasmon resonance based sensors

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