METHOD FOR SYNTHESIS OF SILICON DIOXIDE COATINGS FOR COLLOIDAL GOLD NANOPARTICLES OF DIFFERENT GEOMETRY Russian patent published in 2022 - IPC C01B33/143 C01G7/00 B82B3/00 B82Y30/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to techniques for producing silicon dioxide coatings on the surface of colloidal gold nanoparticles of various geometry and can be used to create passive systems for controlling laser radiation parameters, hybrid structures of the type “semiconductor colloidal quantum dots - metal nanoparticles”. Disclosed is a method for synthesis of coatings, in which the formation of a silicon dioxide shell is carried out in two steps: first, a pre-hydrolysed aqueous solution of a silicon-containing precursor of 3-mercaptopropyltrimethoxysilane (MPTMS) is added to a solution of colloidal gold nanoparticles, then, to increase the shell thickness, a Na₂SiO₃ solution is added, followed by holding in a water bath at temperature of 55–70 °C and constant stirring.

EFFECT: extension of the range of procedures for water synthesis of a homogeneous coating with thickness of 3-30 nm from silicon dioxide for colloidal gold nanoparticles of various geometries with controlled change in thickness of coating due to variation of concentration of Na₂SiO₃ solution, time of thermal treatment of colloidal solution, as well as temperature of synthesis.

1 cl, 3 dwg, 2 ex