title: High yield synthesis of matchstick-like PbS nanocrystals using mesoporous organosilica as template.
abstract: A simple hard template method has been developed to prepare uniform matchstick-like PbS nanocrystals. The approach combines functionalization of the mesoporous walls and channel surface with thioether groups, adsorption of Pb2+, and heating in an N2 atmosphere at high temperature. The structure, morphology and composition of the nanocrystals have been characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The optical properties of the matchstick-like PbS nanocrystals have been systematically investigated by Raman spectroscopy, UV-visible absorption spectroscopy (UV-vis), and photoluminescence spectroscopy (PL). These results demonstrate that these matchstick-like PbS nanocrystals are single crystals and possess novel optical properties, suggesting that they may have many potential applications. A large blue shift is observed in the photoluminescence spectrum, and this clearly shows the quantum size effects of the matchstick-like PbS . Furthermore, a growth mechanism of the PbS heteronanostructure is proposed.
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, 230026, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Deng
authors.forename: Sheng-Liang
authors.initials: SL
authors.lastname: Zhong
authors.forename: Dong-Hong
authors.initials: DH
authors.lastname: Wang
authors.forename: Sha-Sha
authors.initials: SS
authors.lastname: Wang
authors.forename: Tie-Kai
authors.initials: TK
authors.lastname: Zhang
authors.forename: Wen-Gang
authors.initials: WG
authors.lastname: Qu
authors.forename: An-Wu
authors.initials: AW
authors.lastname: Xu
mesh_terms: D003460:Crystallization / Q000379:methods*; D007854:Lead; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D009930:Organic Chemicals / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D018036:Selenium Compounds / Q000138:chemical synthesis*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D009930:Organic Chemicals; D018036:Selenium Compounds; C088065:lead selenide; D007854:Lead; D012822:Silicon Dioxide