Stable Water‐dispersed CdTe Nanocrystals Dependent on Stoichiometric Ratio of Cd to Te Precursor

The improved properties of CdTe nanocrystals (NCs) synthesized by hydrothermal method were introduced. The experimental results indicated that the NCs properties could be dramatically influenced by means of changing Cd‐to‐Te molar ratio (the molar ratio of CdCl₂ and NaHTe in the precursor) of the MPA‐capped CdTe NCs. With the increase of the ratio from 2:1 to 10:1, the formation time of near‐infrared‐emitting CdTe NCs was shortened. In particular, high Cd‐to‐Te molar ratio brought about MPA‐capped CdTe NCs of superior radical oxidation‐resistance and photostability. As a result, the optimum ratio was found to be 8:1 or 10:1 in the study in order to efficiently attain stable, water‐dispersed CdTe NCs.