Predicting the Size of Silver Nanoparticles from Their Optical Properties

Amirjani, Amirmostafa; Firouzi, Farzad; Haghshenas, Davoud Fatmehsari

doi:10.1007/s11468-020-01121-x

Cited by 99 publications

(45 citation statements)

References 32 publications

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“…11 Mie theory is a general solution to Maxwell's equations developed by Gustave Mie to describe the scattering of electromagnetic waves by a spherical particle. 6,[12][13][14] It can be applied to metal nanoparticles, making the assumption that the particles are perfectly spherical. 6 Values typically calculated with Mie theory include optical properties such as the diffusion efficiencies of absorption, scattering and extinction (Qabs, Qabs and Qext respectively) and their corresponding cross sections.…”

Section: Mie Theorymentioning

confidence: 99%

“…[13][14][15] Calculating these values is of interest to chemists and physicists as it allows them to explain and investigate optical properties of nanoparticles, such as the frequencies of light for which LSPR will occur. 12,13,15,16 The extinction cross section (σext), scattering cross section (σsca), and absorption cross section (σabs) of a spherical conducting particle embedded in a medium with a dielectric function of εm are described by the following equations…”

Section: Mie Theorymentioning

confidence: 99%

“…(λ is the wavelength of incident wave); is the radius of the particle; is the electron charge; and L is an integer representing the dipole (L = 1), quadrupole (L = 2), and higher modes of excitations (L = 3, 4, ...). 3,12 Both and are scattering parameters composed of the Riccati-Bessel functions and χ and are modelled by the equations…”

mentioning

confidence: 99%

“…where =̃/ , ̃= + is the complex refractive index of the metal, is the real refractive index of the surrounding medium, and = , where is the radius of the particle. 3,12 It is important to note that = 2 / and is defined as the wavenumber in the medium rather than the vacuum wavenumber. 1 In order to use Mie theory to provide insight to LSPR phenomena, Equations 4-8 need to be simplified.…”

mentioning

confidence: 99%

“…The Rayleigh approximation assumes that the nanoparticle is very small compared to the wavelength of the incoming electromagnetic radiation, and it satisfies the condition that the value of << 1 for Equations 7 and 8. 3,12,13 In the Rayleigh regime of scattering, also referred to as the dipole regime or quasi static regime of scattering, the Riccati-Bessel functions can be simplified into the following: 6,3,12 ≈ − ≈ 0 (Equation 10)…”

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confidence: 99%

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Selective Thermoplasmonic Embedment Of Supported Silver Nanocrystals

Kirkland¹

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Noble metal nanocrystals are known for their unique optical and electronic properties which stem from their ability to support localized surface plasmon resonance (LSPR). These properties have made noble metal nanoparticles extremely popular for applications in sensors, imaging and spectroscopy techniques, and electronic and catalytic devices. In the past twenty years there has been an increase in the interest in the field of thermoplasmonics which focuses on harnessing the LSPR properties of nanoparticles for localized heating applications. The goal of this work was to investigate the selective thermoplasmonic excitation of different types of silver nanocube (AgNC) structures in supported monolayers via thermoplasmonic embedment. AgNCs monolayers were deposited on polystyrene thin films using Langmuir-Schaefer deposition and then subject to different intervals of laser exposure. A wavelength of 458 nm was chosen to selectively embed the individual AgNCs and a wavelength of 568 nm was chosen to selectively embed the silver nanocube clusters (AgClusters). The extent of selective embedment was determined by analyzing the topographic profiles of the different AgNCs and AgClusters in the monolayer following laser exposure. Based on the embedment patterns achieved with the respective wavelengths, it was determined that both types of selective embedment were attained. In addition to being the first reported instance of spatially resolved thermoplasmonics in supported nanoparticle monolayers, these selective embedment techniques show promise for future applications in nanopatterning.

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Section: Mie Theorymentioning

confidence: 99%

Section: Mie Theorymentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Selective Thermoplasmonic Embedment Of Supported Silver Nanocrystals

Kirkland¹

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Enhanced Femtosecond Nonlinear Optical Susceptibility and Terahertz Conductivity in MoSe₂‐Noble Metal Nanocomposites

Mondal,

Haldar,

Pramanik

et al. 2024

Advanced Optical Materials

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Creating heterojunctions or composites by incorporating noble metals offers a remarkable means to modulate the electronic charge transfer and the nonlinear optical (NLO) properties in 2D transition metal dichalcogenides (TMDCs). The response of such 2D‐TMDC‐noble metal composites to femtosecond (fs) infrared (IR) and terahertz (THz) radiation, however, remains vastly unexplored. While the linear optical characteristics of a prototypical 2D‐TMDC, namely, MoSe2 nanosheets incorporated with noble metal (such as Au, Pt, and Ag) nanoparticles in the UV–Vis and the THz spectral range, the NLO characteristics are measured using a 70‐fs pulse at 800 nm excitation is investigated. The results demonstrate a clear reduction of band gap with the incorporation of noble metals in MoSe2, indicating an effective charge transfer mechanism at play. Notably, the MoSe2‐noble metal nanocomposites depicted a significant enhancement in the THz conductivities. In addition, a dramatic 4‐fold enhancement in the third‐order nonlinear coefficient and ≈2‐fold enhancement in the third‐order NLO susceptibility is achieved in MoSe2‐Ag nanocomposite. These results univocally suggest that the noble metal‐based composites with suitable charge transfer channels promote enhanced carrier mobilities and tunable electron transfer dynamics, making these hybrid materials promising candidates for optoelectronic applications both at IR and THz frequencies.

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Production Sericin/Poly(Vinyl Alcohol) Blend Membranes Containing One‐Step Synthesized Silver Nanoparticles by UV Radiation for Obtaining Versatile Antibacterial Materials

Temel,

Nuran Doğan,

Yıldız

et al. 2024

ChemistrySelect

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In this study, silver nanoparticles (AgNPs) were in‐situ synthesized in silk sericin/poly(vinyl alcohol) (SS/PVA) mixtures by an easy one‐step synthesis method with the presence of ultraviolet (UV) radiation. Then, the SS/PVA composite membranes containing AgNPs were obtained by solvent casting method. The chemical structures of the membranes were investigated by fourier‐transform infrared spectroscopy (FTIR) and results showed that the membranes were a mixture of silk sericin and PVA. The morphological features of the membranes were investigated by field emission scanning electron microscopy (FE‐SEM) and it was seen that AgNPs containing membranes have heterogeneous structures. Energy dispersive spectroscopy (EDS) analysis revealed that the membranes contain carbon, oxygen, nitrogen, sulfur and silver. X‐ray diffractometer (XRD) and thermogravimetric (TGA) analyses also proved the presence of AgNPs in the structure of membranes. The antibacterial activities of membranes containing AgNPs were investigated on Staphylococcus aureus and Escherichia coli bacteria with disk diffusion test and liquid culture medium incubation. It was found that SS/PVA membranes containing 5 and 10 mM AgNPs have quite high antibacterial activity on both types of bacteria. The functional SS/PVA membranes have capacity to be used in biomedical applications such as wound care materials.

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Predicting the Size of Silver Nanoparticles from Their Optical Properties

Cited by 99 publications

References 32 publications

Selective Thermoplasmonic Embedment Of Supported Silver Nanocrystals

Selective Thermoplasmonic Embedment Of Supported Silver Nanocrystals

Enhanced Femtosecond Nonlinear Optical Susceptibility and Terahertz Conductivity in MoSe₂‐Noble Metal Nanocomposites

Production Sericin/Poly(Vinyl Alcohol) Blend Membranes Containing One‐Step Synthesized Silver Nanoparticles by UV Radiation for Obtaining Versatile Antibacterial Materials

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Predicting the Size of Silver Nanoparticles from Their Optical Properties

Cited by 99 publications

References 32 publications

Selective Thermoplasmonic Embedment Of Supported Silver Nanocrystals

Selective Thermoplasmonic Embedment Of Supported Silver Nanocrystals

Enhanced Femtosecond Nonlinear Optical Susceptibility and Terahertz Conductivity in MoSe2‐Noble Metal Nanocomposites

Production Sericin/Poly(Vinyl Alcohol) Blend Membranes Containing One‐Step Synthesized Silver Nanoparticles by UV Radiation for Obtaining Versatile Antibacterial Materials

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About

Enhanced Femtosecond Nonlinear Optical Susceptibility and Terahertz Conductivity in MoSe₂‐Noble Metal Nanocomposites