Abstract
ABSTRACT A novel technology has been developed for the synthesis of thioglycolic acid (TGA)-capped CdTe quantum dots (QDs) in aqueous medium. The reaction was carried out in air atmosphere with one-pot by using Na 2 TeO 3 to replace Te or Al 2 Te 3 . The mechanism for the formation of CdTe QDs is elucidated. The influences of various experimental variables, including refluxing time, pH value, Cd/Te and Cd/TGA molar ratios, on the luminescent properties of the obtained CdTe QDs have been systematically investigated. Furthermore, the obtained QDs were characterized by fourier transform infrared spectra (FTIR), X-ray powder diffraction (XRD) and transmission electron microscopy (TEM), respectively. The results demonstrate that, under the optimized experimental conditions, the obtained CdTe QDs exhibited a narrow photoluminescence band (fwhm33-45 nm) with reproducible room-temperature quantum yields as high as 28 %, the emission color is tunable from green to orange with increasing diameter of QDs.
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