Abstract
The present work describes the comparison of the optical and structural properties between CdTe quantum dots (QD) synthesized in water and in the binary solvent (water + glycerin) via one-pot approach synthesis. The optical properties of the nanocrystals obtained with different synthesis parameters were characterized by UV-visible and photoluminescence spectroscopies. The structural chracterization were performed by Fourier transform infrared spectroscopy (FTIR), zeta potential, size-distribution by dynamic light scattering (DLS), X-ray diffraction (XRD), and also by high-resolution transmission electron microscopy (HRTEM). The optical properties of CdTe QD when synthesized in the binary solvent were better, resulting in the increase of photoluminescence quantum yield (φƒ). The CdTe QD prepared in 120 min, at pH 10.0, in the Cd:Te molar ratio 20:1, using the molar ratio 1:1.5 of Cd:TGA (thioglycolic acid), exhibited a narrow photoluminescence band and enhanced φƒ for the samples synthesized in a binary solvent in comparison to water solvent (58.4 and 49.5%, respectively).
Highlights
Quantum dots (QD) are nanocrystalline semiconductors that exhibit strong quantum confinement
Fourier transform infrared spectroscopy (FTIR) exhibits the disappearance of the S−H band in both CdTe samples spectra, due to the formation of the chemical bond of the sulfur to the quantum dots (QD),[19] while it is possible to observe qualitatively in the spectra a relative decrease in C=O band intensity in CdTe QDs synthesized in water + glycerin, indicating that the glycerin may be acting as an additional surface ligand.[24]
Water-soluble CdTe QDs have been successfully synthesized both in water and in a binary solvent prepared by water + glycerin, in the same volume proportions, using the thioglycolic acid as surface ligand
Summary
Quantum dots (QD) are nanocrystalline semiconductors that exhibit strong quantum confinement.
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