Synthesis of flower-like US nanostructures by organic-free hydrothennal process and their optical properties

Flower-like CdS nanostructures consisting of sword-like nanorods have been prepared via organic-free hydrothermal method using thioacetamide (TAA) as sulfur source. X-ray diffraction pattern (XRD) shows that the obtained flower-like US nanostructures are of hexagonal phase. The selected area electron diffraction (SAED) pattern identifies that the flower-like US nanostructures are single crystalline in nature. Furthermore, the optical properties of flower-like US nanostructures have been characterized by ultraviolet-vis (UV-vis) and photoluminescence (PL) spectra. Finally, the investigation on the mechanism indicates that the internal structure and sulfur mass transport controlled by TAA play the critical role in the formation of flower-like US nanostructures. (C) 2006 Published by Elsevier B.V.