By John Donegan, Yury Rakovich
In the final 20 years, semiconductor quantum dots—small colloidal nanoparticles—have garnered loads of medical curiosity as a result of their precise homes. between nanomaterials, CdTe holds detailed technological value because the simply recognized II–VI fabric which can shape traditional p–n junctions. This makes CdTe extremely important for the improvement of novel optoelectronic units akin to light-emitting diodes, sun cells, and lasers. in addition, the call for for water-compatible mild emitters and the commonest organic buffers supply CdTe quantum dots fields a veritable area in biolabeling and bioimaging.
Cadmium Telluride Quantum Dots: Advances and Applications makes a speciality of CdTe quantum dots and addresses their synthesis, meeting, optical homes, and functions in biology and drugs. It makes for a really informative interpreting for an individual excited about nanotechnology and also will profit these scientists who're searching for a entire account at the present nation of quantum dot–related research.
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Additional resources for Cadmium Telluride Quantum Dots: Advances and Applications
69]. Copyright 2011, The Royal Society of Chemistry. Postpreparative Treatment and Processing of CdTe Nanocrystals Direct synthesis of CdTe NCs possessing amphiphilic properties has been recently reported by Dubavik et al. . Application of the thiolated poly(ethylene glycol) (mPEG-SH) as a capping ligand enables the synthesis of NCs in water as well as in a variety of organic solvents. This stabilizer facilitates spontaneous direct and complete transfer across phase boundaries without stirring and/ or agitation or any additional treatments or medium adjustments, while maintaining the emission properties of the CdTe QDs (see Fig.
Oppositely, a comparatively slow growth rate leads to a high content of sulfur (as a product of the thiol decomposition) in the particles and a higher probability of the NC oxidation . It should be noted that it is impossible to completely prevent the incorporation of sulfur into the large nanocrystals either by the choice of the solvent or by a variation of the stabilizers . , higher stability and PLQY, longer PL life times [11,27,55]. Although the NC growth is considered the stage determining the quality of the material and consequently its optical properties, Zhou et al.
9 . This polymer coating significantly enhances the photostability and PLQY of the QDs retarding the diffusion of oxygen as well as detachment of thiol ligands, and consequently preventing the oxidation of the particles surface and the release of Cd2+ ions into the environment. By controlling the molar ratio of PAA-ODA to QDs, the number of QDs in the micelles can be tuned from a single QD to multiple particles. 9 Scheme of the one-pot encapsulation of a QD by amphiphilic PAA-ODA. Reproduced with permission from ref.
Cadmium Telluride Quantum Dots: Advances and Applications by John Donegan, Yury Rakovich