A novel concept of two-component dielectric function for gold nanostars: theoretical modelling and experimental verification

Khlebtsov, Nikolai G.; Zarkov, Sergey V.; Khanadeev, Vitaly A.; Avetisyan, Yuri A.

doi:10.1039/d0nr02531c

Cited by 20 publications

(16 citation statements)

References 51 publications

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“…where ν and E are the frequency and vector of the electric field strength, respectively. To verify the model, the results of the calculation of the absorption and scattering cross-sections were compared with the experimentally determined spectral dependences of the extinction of a suspension of GNS in water and GNS on a glass plate [33]. A good quantitative agreement between the theoretical and experimental results was demonstrated.…”

Section: Statement Of the Problem Of Modeling Hybrid Materialsmentioning

confidence: 96%

“…Plasmon-resonant GNS are of particular interest as a new type of metal nanoparticles used in various technical and biomedical applications [19][20][21][22][29][30][31][32][33]. Compared to nanospheres, the advantage of their use is high absorption of radiation in the NIR (which is important, in particular, for laser medicine and biophotonics, including biosensing, optoporation, and the transfection of cells [19,29].…”

Section: Statement Of the Problem Of Modeling Hybrid Materialsmentioning

confidence: 99%

“…Compared to nanospheres, the advantage of their use is high absorption of radiation in the NIR (which is important, in particular, for laser medicine and biophotonics, including biosensing, optoporation, and the transfection of cells [19,29]. Compared to nanorods, GNS are characterized by a lower orientational and polarization sensitivity of induced optical [33][34][35] and temperature [36] fields. Below, we consider the possibility of intensifying the photoemission of electrons from composite photocathodes based on GNS embedded in a nanoscale film of diamond-like carbon.…”

Section: Statement Of the Problem Of Modeling Hybrid Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of Laser-Induced Plasmon Effects in GNS-DLC-Based Material for Application in X-ray Source Array Sensors

Yakunin

Zarkov

Avetisyan

et al. 2021

Sensors

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An important direction in the development of X-ray computed tomography sensors in systems with increased scanning speed and spatial resolution is the creation of an array of miniature current sources. In this paper, we describe a new material based on gold nanostars (GNS) embedded in nanoscale diamond-like carbon (DLC) films (thickness of 20 nm) for constructing a pixel current source with photoinduced electron emission. The effect of localized surface plasmon resonance in GNS on optical properties in the wavelength range from UV to near IR, peculiarities of localization of field and thermal sources, generation of high-energy hot electrons, and mechanisms of their transportation in vacuum are investigated. The advantages of the proposed material and the prospects for using X-ray computed tomography in the matrix source are evaluated.

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Section: Statement Of the Problem Of Modeling Hybrid Materialsmentioning

confidence: 96%

Section: Statement Of the Problem Of Modeling Hybrid Materialsmentioning

confidence: 99%

Section: Statement Of the Problem Of Modeling Hybrid Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Modeling of Laser-Induced Plasmon Effects in GNS-DLC-Based Material for Application in X-ray Source Array Sensors

Yakunin

Zarkov

Avetisyan

et al. 2021

Sensors

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“…The measured diameter of the nanostar core was 40.0 ± 1.2 nm; the sharp needles had a length of 36.9 ± 5.8 nm. More discussion on nanostar size statistics and its influence on physical properties for stars obtained with the similar synthesis can be found in [43]. The sensor consists of a glass substrate, covered by the thin layer of PVPyr with the deposited Au nanostars.…”

Section: Nanostructure Characterizationmentioning

confidence: 99%

Live Cell Poration by Au Nanostars to Probe Intracellular Molecular Composition with SERS

et al. 2021

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A new type of flat substrate has been used to visualize structures inside living cells by surface-enhanced Raman scattering (SERS) and to study biochemical processes within cells. The SERS substrate is formed by stabilized aggregates of gold nanostars on a glass microscope slide coated with a layer of poly (4-vinyl pyridine) polymer. This type of SERS substrate provides good cell adhesion and viability. Au nanostars’ long tips can penetrate the cell membrane, allowing it to receive the SERS signal from biomolecules inside a living cell. The proposed nanostructured surfaces were tested to study, label-free, the distribution of various biomolecules in cell compartments.

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“…It is worth noting that although multi-factor experiments can obtain polymer-based materials with good dielectric properties, most of the experimental processes are repetitive and redundant, which not only takes time but also increases the economic cost. Mathematical modeling is a simple and effective method to deepen the understanding of experimental mechanisms [ 28 ]. By constructing an appropriate theoretical model, the dielectric properties of polymer-based nanocomposites can be accurately predicted.…”

Section: Introductionmentioning

confidence: 99%

Model-Based Dielectric Constant Estimation of Polymeric Nanocomposite

Jian

Zhou²,

Chen

et al. 2022

Polymers

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The interphase region widely exists in polymer-based nanocomposites, which affects the dielectric properties of the nanocomposites. General models, such as the Knott model, are often used to predict the dielectric constant of nanocomposites, while the model does not take the existence of interphase into account, which leads to a large deviation between the predicted results and the experimental values. In this study, a developed Knott model is proposed by introducing the interphase region and appropriately assuming the properties of the interphase. The modeling results based on the developed model are in good agreement with the experimental data, which verifies the high accuracy of the development model. The influence of nanoparticle loading on the effective volume fraction is further studied. In addition, the effects of the polymer matrix, nanoparticles, interphase dielectric and thickness, nanoparticle size and volume fraction on the dielectric properties of the nanocomposites are also investigated. The results show that polymer matrix or nanoparticles with a high dielectric and thick interphase can effectively improve the dielectric properties of the materials. Small size nanoparticles with high concentrations are more conducive to improving the dielectric properties of the nanocomposites. This study demonstrates that the interphase properties have an important impact on the dielectric properties of nanocomposites, and the developed model is helpful to accurately predict the dielectric constant of polymer-based nanocomposites.

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A novel concept of two-component dielectric function for gold nanostars: theoretical modelling and experimental verification

Abstract: Rational design of AuNST morphology requires adequate computational models. The bulk dielectric function is not applicable to sharp nanostar spikes. We suggest a two-component dielectric function in which the nanostar...

Cited by 20 publications

References 51 publications

Modeling of Laser-Induced Plasmon Effects in GNS-DLC-Based Material for Application in X-ray Source Array Sensors

Modeling of Laser-Induced Plasmon Effects in GNS-DLC-Based Material for Application in X-ray Source Array Sensors

Live Cell Poration by Au Nanostars to Probe Intracellular Molecular Composition with SERS

Model-Based Dielectric Constant Estimation of Polymeric Nanocomposite

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