Abstract
Water-soluble Mn-doped CdS nanocrystals were synthesised by an aqueous colloidal synthetic technique. X-ray diffraction identifies that the Mn-doped CdS nanocrystal is a cubic structure without impurity phase. Transmission electron microscopy suggests a narrow size distribution of the nanocrystals with an average particle size of ∼3.6 nm. Moreover, UV–vis absorption and photoluminescence (PL) spectra of the nanoparticle were also measured. PL results show that Mn-doped CdS nanocrystals have a distinct Mn2+ related emission well-separated from the trap state emission. Reaction variables such as the 3-Mercaptopropionic acid/Cd (MPA/Cd) ratio, reaction temperature and Mn2+ doped concentration were systematically investigated to evaluate the impact of these variables on particle size and optical property. The results indicate that the 2 mol% Mn-doped CdS nanocrystals synthesised at 70°C and the MPA/Cd ratio of 3.5 have the highest PL intensity.
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