METHOD FOR PREPARING WATER-DISPERSIBLE QUANTUM DOTS, COLLOID AND A METHOD FOR PREPARING THE COLLOID

摘要

The method for preparing water-dispersible core-shell quantum dots stabilized with a layer of hydrophilic surface ligands includes making a core of PbS nanocrystals, and obtaining the shell of CdS layer and the surface ligands of dithiocarbamates obtained by reacting amino acids with carbon disulphide, while maintaining the photoluminescence. The emulsion formed of an aqueous solution of amino acid and carbon disulphide includes adding a solution of PbS/CdS in chloroform (CHCl3). Then, the contents are stirred vigorously for at least 20 hours, then the phases are separated. The upper, aqueous phase, being a solution of PbS/CdS/DTC-amino acid residue, is subjected to purification. The present invention is also colloid and a method for preparing colloid.

主权项

1. A method for preparing water-dispersible core-shell quantum dots stabilized with a layer of hydrophilic surface ligands, said method comprising:
making a core of PbS nanocrystals; and reacting amino acids with carbon disulphide so as to obtain a shell of CdS layer and the surface ligands comprised of dithiocarbamates, while maintaining the photoluminescence; wherein the step of reacting comprises:
adding a solution of PbS/CdS in chloroform (CHCl3) to an emulsion of an aqueous solution of amino acid and carbon disulphide;stirring vigorously for at least 20 hours;separating phases so as to obtain an upper, aqueous phase, being a solution of PbS/CdS/DTC-amino acid residue; andpurifying said solution of PbS/CdS/DTC-amino acid residue.