Abstract
To prevent the dissociation of organic ligands from the inorganic core and accordinglyenhance colloidal stability, is the prerequisite for the further application of nanocrystals indifferent areas. Dihydrolipoic acid (DHLA) appears very promising for the stabilization andthe further functionalization of CdTe nanocrystals because DHLA is characterized by acarboxylic acid group and two thiol functions, through which simultaneous anchorage ontoa nanoparticle’s surface is possible. For the first time, we synthesized highly luminescentCdTe nanocrystals (maximum quantum yield of 42%) in aqueous solution by the reaction ofCd2+ and NaHTe using DHLA as capping reagent. The influence of various experimentalvariables, including reaction temperature, ligand-to-Cd ratio and pH value as well asTe-to-Cd ratio, on the growth rate and optical properties of the obtained CdTenanocrystals have been systematically investigated. Furthermore, the stability of thedithiol DHLA capped CdTe nanocrystals was compared with the monothiol ligandsthioglycolicacid (TGA) and mercaptopropionic acid (MPA) capped nanocrystals.Experimental results indicate that the DHLA capped nanoparticles show better chemicaland thermal stability than those capped by TGA or MPA. The mechanism for thehigh-quality optical properties and the good stability of the resulting CdTe nanocrystals isalso primarily elucidated.
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