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Synthesis Spectrum Properties of High-Quality CdS Quantum Dots

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High-quality CdS quantum dots with zinc-blende structure were prepared in noncoordinating solvent 1-octadence (ODE), using N-oleoyl-morpholine as an alternative solvent for sulfur powder, oleic acid (OA) as capping ligand. Sulfur powder could be dissolved in N-oleoyl-morpholine at room temperature. The kinetics of nucleation/growth was monitored via the temporal evolution of optical properties of the as-prepared CdS quantum dots. Various synthetic parameters were systematically investigated, such as growth temperature of 190 °C–260 °C, OA concentrations of 1.5 mL–2 mL, and the feed molar ratios of (0.5–3) Cd/1S. With increasing feed molar ratio of Cd/S, little trap emission could be observed. The feed molar ratio of 3Cd/1S was suggested to be the optimal synthetic window, together with the amount of OA 1.5 mL and the growth temperature of 210 °C. The quantum dots with growth periods ranging from 0 to 900 s at 210 °C exhibited their first excitonic absorption peak changing from 359 nm to 429 nm and the corresponding average size moved from 2.26 nm to 4.41 nm. The narrowest PL FWHM we obtained was 16 nm. Typical HRTEM images revealed that the as-prepared CdS quantum dots had narrow size distribution and high crystallinity.


Document Type: Research Article


Publication date: 2010-10-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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