The paper describes the results of finite-difference time-domain (FDTD) mathematical modeling of electromagnetic fields distortion near the planar SIO2 surfaces modified with gold nanostars. The calculated field values were converted into the electromagnetic field enhancement coefficient and the surface-enhanced Raman scattering (SERS) intensity. Prospects of the theoretical approach for planar SIO2 surfaces modified with gold nanostars modeling to evaluate optimal field amplification and light-scattering parameters have been shown. The presented approach could be applied as a basis for performing methods of controlled synthesis of effective SERS-based biocompatible sensors.
This paper describes a detailed study of spectral and time-resolved photoprocesses in human platelets and their complexes with platinum (Pt) nanoparticles (NPs). Fluorescence, quantum yield, and platelet amino acid lifetime changes in the presence and without femtosecond ablated platinum NPs have been studied. Fluorescence spectroscopy analysis of main fluorescent amino acids and their residues (tyrosine (Tyr), tryptophan (Trp), and phenylalanine (Phe)) belonging to the platelet membrane have been performed. The possibility of energy transfer between Pt NPs and the platelet membrane has been revealed. Förster Resonance Energy Transfer (FRET) model was used to perform the quantitative evaluation of energy transfer parameters. The prospects of Pt NPs usage deals with quenching-based sensing for pathology’s based on platelet conformations as cardiovascular diseases have been demonstrated.
This article is a continuation of research in the field of modeling nanoparticles by various FDTD methods. This article clarifies what geometrical parameters are necessary to obtain the highest value of the elec tric field for core-shell particles with a gold (Au) core with a silicon (SiO2) shell; the other part is related to the modeling of silver nanorods (Ag). Both simulations were performed under the action of one plane polarized wave 𝜆 = 532 nm. Parameters such as the height of the rod, the radius of the cross section of the rod were varied; for the core-shell particle, the radius of the particle and the thickness of the SiO2 layer were varied. The analysis of the values of the electric (E) field component of these particles is carried out and compared with each other. The advantage of theoretical modeling by the FDTD method using our algorithm is shown. The presented data can be used as a basis for controlled chemical synthesis of spherical nanoparticles.
The paper continues [12] the Finite-Difference Time-Domain (FDTD) mathematical modeling method application of electric field distortion near the surface of spherical gold nanoparticles functionalized by two shells: water shell as a model substance for a drug and SiO2 as a capsuling silicon polymer. During the simulation, parameters such as particle size, the thickness of surface layers, the wavelength of exciting radiation, and the dependence of the effective amplification of the E component of electromagnetic field on the thickness of the polymer and water layers were investigated. The prospects of the theoretical approach of core-shell complexes for theranostics tasks are shown. The data presented can be used as a basis for controlled chemical synthesis of spherical nanoparticles.
The paper performs Finite-Difference Time-Domain (FDTD) mathematical modeling method application of electric field distortion near the surface of rough gold surfaces. During the simulation, parameters such as particle size, nanoparticles height, the effective amplification of the E component of electromagnetic field on the surface morphology were investigated. The prospects of the theoretical approach of rough surface modeling for sensory purposes tasks are shown. The data presented can be used as a basis for controlled nanolithography fabrication of gold rough surfaces.
The paper presents the results of FDTD (Finite-Difference Time-Domain) mathematical modeling of electromagnetic fields distortion near the surfaces of multilayered spherical gold nanoparticles (NPs). NPs were functionalized by two shells: water as a model substance for a drug and SiO2, as a capsuling polymer. The field values were converted into the coefficient of the effective signal for Surface-Enhanced Raman Scattering (SERS). During the simulation, parameters such as NP size, thickness of surface layers, wavelength of exciting radiation and the dependence of the effective amplification of the electromagnetic field on the thickness of the polymer and water layers were studied. The prospects of the theoretical approach of nanocomplexes for problems of theranostics have been shown. The presented approach could be applied as a basis for performing methods of controlled chemical synthesis of colloidal theranostics NPs.
Paper performs results of SERS-active surfaces fabrication for Raman bacterial cells analysis. Based on FDTD simulation, the synthesis of colloidal gold nanoparticles (NPs) with the size range of 10 – 100 nm has been performed by the following methods: a) femtosecond laser ablation of a plate in a liquid; b) chemical reduction from tetrachloroauric acid trihydrate (HAuCl4). Optimal sizes and shapes of the particles with a maximum of plasmon absorption in the range 500 – 800 nm have been determined by numerical simulation. For NPs deposited on quartz glass with rodamine 6G (R6G) and E. Coli bacterial cells, SERS solutions have been tested.
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