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Non-TOP and Non-Injection Synthesis of Zinc-Blende CdSe Using Cyclo-Hexeno-1,2,3-Selenadiazole: Quantum Dots versus Magic-Size Nanocrystals

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The controlled synthesis of CdSe quantum dots via the thermolysis of a labile selenium precursor i.e., cyclohexeno-1,2,3-selenadiazole has been investigated at the specific Se to Cd mole ratios of 1:1 and 1:2. The experimental results reveal that the reaction of selenadiazole with cadmium acetate at 180 °C in the presence of oleic acid and diphenyl ether produces exclusively zinc-blende (cubic) crystallites of ∼3 nm size. Varying the temperature, surfactants, solvent and surfactant ratio demonstrate conditions which are specific either for the formation of “quantum dots” or “magic-size” nanoclusters. The present non-injection approach where the reactivity and concentration of reactants are useful parameters for exercising control over the type of particle formed is a “green” synthesis avoiding the use of generally employed “toxic” phosphine or amine reagents and produces quantum dots of high quality. The detailed spectral characterization of quantum dots by UV-visible (UV-Vis), photoluminescence (PL), infra-red (IR) and X-ray photoelectron spectroscopy (XPS) analysis as well as by transmission electron microscopy (TEM), energy dispersive analysis of X-ray (EDAX) and X-ray diffraction (XRD) measurement is described.
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Keywords: CHEMICAL SYNTHESIS; MAGIC-SIZED NANOCRYSTALS; OPTICAL PROPERTIES; QUANTUM DOTS; SEMICONDUCTORS

Document Type: Research Article

Publication date: 2011-11-01

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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