Structural properties of coated nanoparticles: the CdS/ZnS nanostructure

The production of nanosized semiconductor nanostructures composed of a core of CdS nanocrystals coated with a ZnS layer has been attempted by using a method of inverted micelles. The structural aspects of nanocrystals have be en investigated by high-resolution transmission electron microscopy. The Cd S/ZnS core/shell heterostructure has been evidenced. The epitaxy of ZnS on CdS has been observed, abrupt CdS-ZnS interfaces have been found and the ac commodation mode between the two materials has been analysed. It has been s hown that the ZnS shell grows with the same structure as the CdS core, whic h is either in the cubic blende-type structure or in the hexagonal wurtzite -type structure.