Abstract
High quality quantum dots (QDs) CdSe were prepared using a novel and non-TOPmethod. Quantum dots of different sizes ranging from 2 to 4 nm could be obtained byremoving aliquots of the reaction solution at different time intervals or by adjusting somereaction conditions. The CdSe quantum dots (core) were directly coated with silica (shell)using a microemulsion method. The design and preparation of a model QD/silica wasdescribed and characterized using transmission electron microscopy (TEM), UV–visabsorption, photoluminescence and laser confocal scanning microscopy. TEMimages confirmed the well-monodispersed QDs and the silica shell around theCdSe core, respectively; laser confocal microscope images, UV–vis absorption andphotoluminescence spectra clearly indicated that both the original QDs and thesilica-coated QDs had good fluorescence properties. The quantum dots coated with silicashells were stable, water-soluble and less toxic (due to the silica shells), and areanticipated to be used as fluorescent probes for biosensing and imaging applications.
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