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Plasmon control of molecules luminescence in the structure of an adsorbed polymer chain on the charged spherical nanoparticle surface
Kucherenko M.G.
1, Rusinov A.P.
1, Kruchinin N.Yu.
1
1Center of Laser and Information Biophysics, Orenburg State University, Orenburg, Russia
Email: clibph@yandex.ru, sano232@mail.ru, kruchinin_56@mail.ru
The formation of a stable conformational structure of a polyampholytic macromolecule during its adsorption on the surface of a plasmonic nanoparticle is considered. It is shown that the placement of an additional electric charge on a nanoparticle changes the architecture of the polymer superstructure, the degree of its looseness and, consequently, the order of distancing (localization) of phosphor molecules associated with the macrochain. This leads to a change in the emissivity of the system due to a change in the mode of plasmon assisting radiation transitions. This effect makes it possible to consider charge transfer to a nanoparticle as a factor of supramolecular structural control of the radiative properties of hybrid metal-polymer composites in functional nanodevices for various purposes. The performed molecular dynamic modeling of some polyampholytic polypeptides on a charged metal nanoparticle demonstrates the swelling of the polymer shell, which is structured in layers depending on the charge sign of the amino acid residue, and its thickness depends on the distance between the charged links in the macromolecule. Keywords: luminescence of molecules, polypeptide, adsorption, metal nanoparticle, plasmon resonance, polyampholite.
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