Simulation of Electrodynamic and Photothermal Properties of Colloidal Silver Nanoparticles Stabilized with Organic Shell

The electrodynamic and photothermal properties of spherical silver nanoparticles with a diameter of 31 nm and a shell corresponding to the optical-electrical parameters of succinic acid in a phosphate buf­fered saline medium were simulated. It was found that such nanoparticles are capable of enhancing the electric field near the surface by up to 37 times. The electric field strength enhancement coefficient significantly depends on the distance between the nanoparticles and decreases by 10 times with a change in the distance from 1 to 30 nm. It was shown that an increase in the thickness of the shell of succinate ions of succinic acid leads to a shift in the resonance wavelength of silver nanoparticles to a longer-wavelength region. Irradiation of nanoparticles in the mode of excitation of localized surface plasmon resonance causes heating of nanoparticles to 86 °C, and the presence of a succinic acid shell contributes to an increase in the heating temperature above 100 °C with increasing thickness.