Open AccessПочему наночастицы магнетит/золото со структурой ядро-оболочка недостаточно хороши и как их улучшить
Author(s) -
А.Э. Соколов,
О.С. Иванова,
А.С. Федоров,
Е.А. Ковалева,
М.А. Высотин,
Chun-Rong Lin,
С.Г. Овчинников
Publication year - 2021
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2021.09.51312.19h
Subject(s) - magnetite , materials science , titanium , colloidal gold , nanoparticle , wetting , nanotechnology , layer (electronics) , coating , chemical engineering , metallurgy , composite material , engineering
In this paper a short review of experimental and theoretical recent researches of magnetic core-shell nanoparticles with noble metals shell is given. Magnetic nanoparticles of Fe3O4 coated with a gold shell are in demand in many biomedical applications. However, there are practically no good nanoparticles completely and uniformly coated with gold. In this paper, we investigated the formation of a chemical bond at the magnetite/gold interface. In the framework of DFT-GGA calculations, the geometric structure, electronic and magnetic properties of flat layers consisting of Fe3O4 magnetite, titanium, and gold are studied. It is established that the specific energy and wetting parameters of the magnetite-gold interface are negative, while these values of the magnetite-titanium (for thin Ti layers) and magnetite-titanium-gold boundaries are positive. This allows us to hope that an intermediate thin layer of titanium at the boundary between the surface of the magnetite nanoparticle and the gold layer will stabilize this three-layer structure and allow obtaining magnetite nanoparticles coated with a solid gold coating.