Abstract:

Bismuth sulfide is considered as an environment-friendly material.Here, $Bi_{2}$$S_{3}$ quantum dots ($Bi_{2}$$S_{3}$ QDs) were synthesized with a new method using 11-mercaptounde-canoic acid as a capping agent. The $Bi_{2}$$S_{3}$ QDs showed stable properties over 6 months in the atmosphere. The maximum emission wavelength for $Bi_{2}$$S_{3}$ QDs was 500 nm. The ligand exchange process between S$^{2-}$ and acetylacetonate was a critical step in the synjournal of $Bi_{2}$$S_{3}$ QDs. Spherical cores of $Bi_{2}$$S_{3}$ were formed by the nuclei due to the orientation-directed effect of acetylacetonate. The Bi$^{3+}$ ions at the surfaces of $Bi_{2}$$S_{3}$ QDs were capped by 11-mercaptoundecanoic acid molecules that could efficiently stabilize the $Bi_{2}$$S_{3}$ QDs.

Key words: bismuth sulfide, quantum dots, luminescence, solvent-thermal method