A new route to zinc-blende CdSe nanocrystals: Mechanism and synthesis

Article Abstract:

A mechanism of forming of CdSe nanocrystals in the high boiling point solvents with long alkaline chains and a Non-TOP-Based route to zinc-blende CdSe nanocrystals is reported. This mechanism makes it possible to achieve high-quality CdSe nanocrystals with sharp ultraviolet and visible (UV-vis) absorption peaks, controllable size (2.0-5.0 nm), bright photoluminescence (PL), narrow PL full width of half-maximum (fwhm)(29-48 nm), and high PL quantum yield (up to 60%) without any size sorting.

Selenium Compounds, Zinc compounds

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A full multiple scattering model for the analysis of time-resolved X-ray difference absorption spectra

Article Abstract:

A full multiple theoretical model (MAXN) is applied to fit picosecond difference X-ray absorption spectra at the ruthenium L3 edge upon photoexcitation of aqueous [[[Ru.sup.III][(bpy).sub.3]].sup.2+]. The fitting difference spectra have allowed an increase in sensitivity, such that slight structural changes could be retrieved, which are not detected in fitting full spectra.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Nitrogen Compounds, Ruthenium, Analysis, Spectrum analysis, Spectra, Optical properties, X-ray spectrometry

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Synthesis of high quality zinc blende CdSe nanocrystals

Article Abstract:

Highly homogenous and luminescent CdSe colloidal nanocrystals in the less common zinc blende crystal structure are obtained at high temperature in a noncoordinating organic solvent. It is found that compared to standard colloidal CdSe preparations, the growth rate is considerably reduced, and the energy gap between the first two absorption bands becomes larger.

Science & research, Research, Chemical synthesis

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