Hydrothermal synthesis of PbS hollow spheres with single crystal-like electron diffraction patterns

作者：Zhao Pingtang; Wang Jinmin; Chen Guoe; Mao Zhou; Zhou Jing; Chen Dean; Huang Kaixun^*

来源：Journal of Nanoscience and Nanotechnology, 2008, 8(1): 379-385.

DOI：10.1166/jnn.2008.016

• PbS hollow sphere
• hydrothermal process
• characterization

PbS hollow spheres were successfully prepared by a sodium citrate-assisted hydrothermal process at 120 degrees C for 12 h, employing lead acetate trihydrate, thiourea and sodium citrate as precursors. The diameter of PbS hollow spheres is 200-400 nm, which is composed of about 50-80 nm nanoparticles. The synthesized product was characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), electron diffraction (ED), Fourier transform-infrared (FT-IR) spectroscopy, ultraviolet-visible spectrometer (UV-vis) and near-infrared absorption spectrometer (NIR). The effects of the reaction conditions on morphologies of PbS structures were investigated. Star-shaped and flat PbS crystals were obtained by changing some experiment conditions. The results show that temperature, sodium citrate concentration, sulfur sources and solvent play key roles on the final morphologies formation of PbS crystals. Especially, ED result indicates that PbS hollow spheres hold single crystal-like electron diffraction patterns. And the possible formation mechanism of hollow spheres was proposed.

• 出版日期2008-1
• 单位华中科技大学