Si/ZnS and Si/ZnSe core/shell nanocrystal structures

Hu, J.Q.; Bando, Y.; Zhan, J.H.; Golberg, D.
October 2004
Applied Physics Letters;10/18/2004, Vol. 85 Issue 16, p3593
Academic Journal
We report on the synthesis of the Si/ZnS and Si/ZnSe core/shell nanocrystal structures produced via a two-stage thermal evaporation of SiO and ZnS or SiO and ZnSe powder mixtures. These core/shell structures display spherical and elliptical polycrystalline particles. Most of the Si/ZnS core/shell nanocrystal structures have diameters of ∼90–160 nm; the diameters of the cores and the thicknesses of the shells vary in a range of ∼50–100 nm. The diameters of the Si/ZnSe core/shell nanocrystal structures range from ∼150 to ∼200 nm; the thicknesses of the shells are rather uniform, ∼30 nm, and the diameters of the cores are thus in the range of ∼120–170 nm. Room-temperature photoluminescence was also investigated from as-synthesized Si/ZnS and Si/ZnSe core/shell nanocrystal structures, respectively.


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