Preparation of dentritic PbS nanostructures by ultrasonic method

Dentritic-like lead sulfide nanostructures were successfully prepared using lead acetate trihydrate, thioacetamide (TAA), and nitrilotriacetic acid as precursors without any surfactants by ultrasonic method at low temperature (40 °C), little time (40 min). The products were characterized by field emission scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and near-infrared absorption spectroscopy. The near-infrared absorption spectrum of the dentritic PbS nanostructures shows one absorption peak at about 1259 nm. Possible growth mechanism of dentritic PbS nanostructures is presented. This approach is expected to be employed for the control-shaped synthesis of other semiconductor nanostructures.