Preparation And Morphology And Particle Size Control Of CdS Nanoparticles

CdS semiconductor nanoparticles have special properties in some fields such as photoelectricity, magnetism, catalyse and energetics and so on, which is closely related to their different particle size and morphologies. So it is exstemely important to prepare CdS semiconductor nanoparticles with controllable particle size, shape and crystallinity.Based on the design ofmonodispersed system, microwave heating, spraying materials and homogeneous precipitation technology were adopted to assure the uniformity of the temperature and concentration in the solution. The mechanism for structure and morphology control of CdS nanoparticles prepared by homogeneous precipitation was revealed, and then the growth unit model and growth mechanism model were established, in the solution, colloidal core and anion coordination tetrahedron were co-existing. When the supersaturation was higher, the growth of particleswas mainly subject to colloidal core and poor crystallinity products were obtained. On the contrary, anion coordination tetrahedron played a more important role and powders with rule shape and better crystallinity were obtained. These growth units were absorbed and join the crystal lattice on the growth interface through collision and aggregation.