Some recent applications of chalcogenides QDs in the fields of solar cell, optical fibre amplifiers, biosensing and bo-imaging are discussed and reviewed. Nanoparticles and self-assemblies of CdSe, CdTe, HgTe and ZnSe are synthesized using new and facile single molecular precursor based noble route by our group that uses non-pyrophoric, low temperature and non-toxic chemicals, their properties and synthesis scheme are discussed as future development in this field. Materials and Methods Materials Phenylethylene, polyvinyl pyrrolidone (PVP K30, Mn 58,000), K 2 S 2 O 8, tetrabutyl titanate (TBOT), methyl alcohol, and dimethyl carbinol were acquired from Shanghai Macklin Biochemical. At first, dispersion of SiO 2 nanoparticles in ethanol was performed by sonication. Role of various factors that affect the nucleation and growth of nanoparticles is discussed at length. We also propose the mechanism for the photocatalytic performance of hollow CdSTiO 2 coreshell structures. Preparation of SiO 2 TiO 2 Core-Shell Nanocomposite Particles The coating reaction was performed in ethanol at room temperature by the hydrolysis and condensation of titanium-tetra-n-butoxide (TBOT). In the present review, synthesis strategies of size and shape controlled nanoparticles belonging to II-VI group of semiconductor chalcogenides are presented and each method for preparation of nanoparticles is critically analysed. In the last couple of decades, facile routes for their synthesis and strategies for controlling the size, shape and morphology have been reported. Chalcogenide semiconductor nanoparticles and their self-assembly structures have become the most explored group of semiconductor nanomaterials due to the interesting physics involved in quantum confinement, surface chemistry and variety of applications. the titania coating could be controlled from 20.7 to 32.6 nm, along with increase of refractive indices (1.77 2.03) and densities (2.67 3.05 g/cm3) of the resulting PS/COPS-I/TiO2coreshell particles.
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