Abstract
Silver sulfide (Ag2S) near-infrared quantum dots have been synthesized by one pot process and the water solubility of the quantum dots was enhanced by ligand exchange. With the addition of zinc source, zinc sulfide (ZnS) nanocrystals grew like a link with the Ag2S in head-to-tail structure. Furthermore, in the presence of manganese dopants, particles exhibited twice the length of previous size. The optical and structural properties of these three kinds of quantum dots (Ag2S, Ag2S/ZnS, and Mn-doped Ag2S/ZnS) were characterized through photoluminescence spectra, UV-Vis absorption spectra, and transmission electron microscopy. It has been found that a linked structure is formed in ZnS-Ag2S-ZnS by manganese doping.
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