Abstract: Chemical controlling the morphology of the CdS nanocrystals fabricated by hydrothermal method was studied. Different coordination agents were chosen as templates to test their effects on the shape of the produced CdS nanocrystals. It was found that when ethylenediamine or methylamine was employed as the template, CdS nanocrystals display rod-like shapes with a dimension of （20～30）nm×（200～600） nm and （40～50） nm×（200～600） nm, respectively. In contrary, only particles of CdS nanocrystals with an average size of about 30 nm or 20 nm were observed if pyridine or ammonia was used. XRD、TEM、PL(photoluminescence)、Raman spectroscopy and XPS techniques were used to characterize the as produced CdS nanocrystals. Our experimental results suggested that bidentate ligands and high stability constant of the template complex might not be the only critical factors to the growth of CdS nanorods. A complex structure induced growth mechanism was proposed to explain the morphology control of CdS nanocrystals in hydrothermal synthesis.

Key words: CdS, Coordination agent, Template, Hydrothermal synthesis