METHOD FOR SYNTHESIS OF MODIFIED CADMIUM SULPHIDE QUANTUM DOTS Russian patent published in 2025 - IPC C09K11/54 C09K11/56 B82B3/00 B82Y30/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to analytical chemistry and can be used in developing non-invasive methods for diagnosing the state of living systems based on test systems and gas sensors. First, aqueous solutions of (CH₃COO)₂Cd and Na₂S are prepared with concentrations of 0.02-0.08 mol/dm³ and 0.17-0.23 mol/dm³ respectively. Then 10 cm³ of prepared solution of (CH₃COO)₂Cd, 31 cm³ of distilled water and 9 cm³ of prepared Na₂S solution at temperature 18-30 °C is poured in portions into an aqueous solution containing 2-3 wt.% organic polymer and a modifier in amount of 5-20% of the weight of the stabilizing cladding. Distilled water is used to prepare all aqueous solutions. Organic polymer used is chitosan, dextrin or polyvinylpyrrolidone. Modifier used is an acid-base indicator, an organic dye with fluorescent properties or dicyclohexane-18-crown-6. Obtained colloidal solution is centrifuged until the precipitate is separated, which is washed many times in alcohol or acetone.

EFFECT: formed cadmium sulphide quantum dots have a stabilizing shell made from said polymer with said modifiers and exhibit different sorption properties on highly volatile organic analyte vapour.

1 cl, 2 dwg, 3 tbl, 2 ex