METHOD FOR DECORATING THE SURFACE OF SEMICONDUCTOR AGS QUANTUM DOTS WITH GOLD NANOPARTICLES TO CONTROL THE LUMINESCENT PROPERTIES Russian patent published in 2022 - IPC C01G5/00 C09K11/56 C09K11/58 B01J13/00 B82B3/00 B82Y30/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to inorganic chemistry and can be used in nanosensor apparatuses and apparatuses for controlling the optical emission parameters. The surface of semiconductor Ag₂S/SiO₂ quantum dots (QD) with an average size of 2.5 to 5.0 nm is functionalised with 3-aminopropyl trimethoxysilane (APTMS) at a molar ratio QT:APTMS of at least 1:600. The functionalised Ag₂S/SiO₂/APTMS QD are deposited and separated from the reaction products by centrifugation with a rotation speed of at least 15,000 rpm until the solution is completely discoloured. The QD are then resuspended in a volume of a 96% ethanol solution equal to the volume of the initial solution of semiconductor Ag₂S/SiO₂ QD. The colloidal solution of functionalised CT is mixed with a colloidal solution of gold nanoparticles with an average size of 1 to 2.5 nm at a volume ratio of the solutions of at least 1:5 and not greater than 1:50, constantly stirring at a speed of 200 to 500 rpm. The resulting mixture is sustained for at least 24 hours at room temperature and without stirring, then centrifuged with a rotation speed of at least 15,000 rpm, re-resuspended in a volume of distilled water equal to the volume of the solution of semiconductor Ag₂S/SiO₂/APTMS QD, taken to be mixed with the colloidal solution of gold nanoparticles. To form a fragmentary shell of gold nanoparticles with a thickness of up to 2 monolayers on the surface of the semiconductor QD, the corresponding operations are repeated in the stated order.

EFFECT: invention allows for a 10 time increase in the quantum luminescence yield of the resulting semiconductor Ag₂S QD decorated with gold nanoparticles and ensures control of the luminescent properties and the level of non-linear refraction thereof.

1 cl, 4 dwg, 2 ex