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Rapid thermal annealing has been applied to poly(acrylic acid)-capped CdTe nanoparticles. This annealing process has shown to provide some control over the semiconductor core properties, while preserving the capping ligand intact. The photoluminescence and absorption properties of the nanoparticles remain nominally unchanged up to annealing temperatures of 400 °C and annealing durations of 30 s. This process was found to be an effective postsynthesis means of improving the crystallinity of the semiconductor core. The crystallinity enhancement is identified by solution-based Raman spectroscopy using a hollow-core photonic crystal fiber. This novel method of detecting a crystalline change in nanoparticles is corroborated by powder X-ray diffraction measurements and X-ray photoelectron spectroscopy.
Because of their superior photostability and fluorescence quantum yield, quantum dots are of great interest for biological applications. Unfortunately, most commercial quantum dots require a surfactant solubilizing layer to disperse in aqueous media. This significantly increases their effective diameter and limits their appeal for single molecule studies. Thus Carboxylate capped CdTe nanoparticles, which are water soluble, represent an attractive solution. We used fluorescence correlation spectroscopy to characterize the properties of these quantum dots. Our study confirms that they have small ~ 10 nm hydrodynamic radii. It also confirms that they undergo an excitation intensity dependent blinking process characterized by a power law distribution of "on" and "off" dwell times. This power law breaks down at dwell times on the order of ~10 μs.
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