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We report the synthesis of spherical ZnTe nanocrystals and the successive coating with a ZnS shell to afford core/shell quantum dots. These nanocrystals can represent alternatives to cadmium-based quantum dots but their preparation and properties are challenging and relatively unexplored. The effect of various synthetic parameters on the reaction outcome was investigated, and the resulting nanocrystals were characterized by TEM, EDX, XPS, and spectroscopic measurements. The optical data indicate that these core/shell quantum dots belong to type I, i.e., both the electron and the hole are confined within the ZnTe core. Both the ZnTe core and ZnTe/ZnS core/shell quantum dot samples absorb in the visible region and are not luminescent. The ZnS shell preserves the optical properties of the core and improves the chemical and photochemical stability of the nanoparticles in air equilibrated solution, whereas …
Royal Society of Chemistry
Publication date: 
1 Jan 2014

Christophe Lincheneau, Matteo Amelia, Marek Oszajca, Alice Boccia, Fabio D'Orazi, Mattia Madrigale, Robertino Zanoni, Raffaello Mazzaro, Luca Ortolani, Vittorio Morandi, Serena Silvi, Konrad Szaciłowski, Alberto Credi

Biblio References: 
Volume: 2 Issue: 16 Pages: 2877-2886
Journal of Materials Chemistry C