METHOD OF OBTAINING SEMICONDUCTOR COLLOIDAL SILVER SULFIDE QUANTUM DOTS Russian patent published in 2015 - IPC C09K11/56 C09K11/58 B82B3/00 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to colloidal chemistry and can be used in luminescent labels, as well as in production of materials for lasers, light diodes, solar panels, and photocatalysts. First, sodium sulfide and silver nitrate are prepared separately. For this purpose 0.01-0.5 g of sodium sulfide and 0.01-0.5 silver nitrate are dissolved in 40-200 ml of cold distilled water. 0.5-20 g of gelatin swell in reactor for 30 min in 100-500 ml of distilled water with temperature from 20-30°C. Obtained gelatin solution is heated to 40-90°C with mixing, 5 ml of 96% ethanol are poured into it. After that, double-stream pouring of prepared solutions of sodium sulfide and silver nitrate is realised, with further heating for 10-20 min with obtaining sol of colloidal silver sulfide quantum dots and cooling to 4-10°C for 10 hours. Obtained jelly is crushed to size of granules 5-10 mm, washed with distilled water at temperature 7-13°C, excess of water is decanted and granules are heated to temperature higher than 40°C.

EFFECT: invention makes it possible to obtain silver sulfide quantum dots with size 1-5 nm in gelatin matrix, luminescent in the range 800-1100 nm.

2 cl, 4 dwg, 2 ex