title: Hydrothermal synthesis of PbS hollow spheres with single crystal-like electron diffraction patterns.
abstract: 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.
authors.affiliation: Department of Chemistry Huazhong University of Science and Technology, 1037 Luoyu Lu, Hongshan Qu, Wuhan, Hubei 430074, People's Republic of China.
authors.forename: Pingtang
authors.initials: P
authors.lastname: Zhao
authors.forename: Jinmin
authors.initials: J
authors.lastname: Wang
authors.forename: Guoe
authors.initials: G
authors.lastname: Chen
authors.forename: Zhou
authors.initials: Z
authors.lastname: Xiao
authors.forename: Jing
authors.initials: J
authors.lastname: Zhou
authors.forename: Dean
authors.initials: D
authors.lastname: Chen
authors.forename: Kaixun
authors.initials: K
authors.lastname: Huang