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    National Tsing Hua University Institutional Repository > 工學院  > 化學工程學系 > 期刊論文 >  One-step formation of core-shell sulfide-oxide nanorod arrays from a single precursor

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/38029

    Title: One-step formation of core-shell sulfide-oxide nanorod arrays from a single precursor
    Authors: Yi-Feng Lin;Yung-Jung Hsu;Shih-Yuan Lu;Wei-Shan Chiang
    教師: 呂世源
    Date: 2006
    Publisher: Institute of Physics
    Relation: NANOTECHNOLOGY, Institute of Physics, Volume 17, Issue 18, SEP 28 2006, Pages 4773-4782
    Keywords: metalorganic chemical vapour deposition
    Abstract: ©2006 IOP - Densely packed and well-aligned coaxial (core–shell) CdS–CdO and ZnS–ZnO nanorod arrays were prepared with a one-step, non-catalytic, template-free metalorganic chemical vapour deposition (MOCVD) process by using single-source molecular precursors Cd(O-EtXan)2 and Zn(O-EtXan)2, respectively (O-EtXan = S2COCH2CH3). Data from pyrolysis gas chromatography/mass spectrometry of the precursors revealed the sequence of formation, namely sulfide core first and oxide shell later, with the first formed sulfide nanorods serving as the template for subsequent in situ oxide shell coating. The coaxial CdS–CdO and ZnS–ZnO nanorod arrays were formed at collection temperatures of 180 and 200 °C, respectively. At a slightly higher collection temperature of 250 °C, coaxial ZnS–ZnO nanowires were also obtained. The coaxial nanostructure was characterized and confirmed with high-resolution transmission electron microscopy. In a photoluminescence study, near band edge emissions at around 530 nm, a composite emission of the two near band edge emissions of 524 nm of CdS and 551 nm of CdO, were observed for the coaxial CdS–CdO nanorod sample, while defect-induced emissions at around 470 nm were observed for both coaxial ZnS–ZnO nanorod and nanowire samples. A more stable oxide shell not only protects the sulfide core but also provides possible surface passivation beneficial to enhanced photoluminescence. The present work demonstrates the feasibility of growth of coaxial one-dimensional nanostructures from single-source precursors that contain all the necessary constituent elements in one compound.
    URI: http://www.iop.org/
    Appears in Collections:[化學工程學系] 期刊論文

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