![]() Our technique allows one to transform already contacted single nanowires, and the obtained heterojunction nanowires manifest a noticeable gain in conductance. If this exit pathway is blocked, the cation exchange cannot occur. We show that the cation exchange at the CdSe/Cu 2 Se interface is only possible if the displaced Cd 2+ ions can radially out-diffuse to the solution phase. Interestingly, the heterojunction interfaces are almost atomically sharp, and the adjacent CdSe and Cu 2 Se domains exhibit epitaxial relationships. In this work, we fabricate nanowire CdSe/Cu 2 Se heterojunctions by masking cation exchange via electron-beam irradiation, such that cation exchange proceeds only in the non-irradiated sections. Regarding single nanocrystal structures, such spatial control of cation exchange enables the design of heterostructures, which can be integrated in functional optoelectronic elements. Some recent applications of chalcogenides QDs in the fields of solar cell, optical fibre amplifiers, biosensing and bo-imaging are discussed and reviewed.Ĭation exchange is a versatile tool to control the composition of nanocrystals, and recently deterministic patterning could be achieved by combining it with lithography techniques. 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. Role of various factors that affect the nucleation and growth of nanoparticles is discussed at length. 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.
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