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Synthesis of Core-Shell Inorganic Nanotubes

机译：核壳型无机纳米管的合成

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New materials and techniques pertaining to the synthesis of inorganic nanotubes have been ever increasing since the initiation of the field in 1992. Recently, WS_2 nanotubes, which are produced now in large amounts, were filled with molten lead iodide salt by a capillary wetting process, resulting in Pbl_2@WS_2 core-shell nanotubes. This work features progress in the synthesis of new core-shell nanotubes, including Bil_3@WS_2 nanotubes produced in a similar same manner. In addition, two new techniques for obtaining core-shell nanotubes are presented. The first is via electron-beam irradiation, i.e., in situ synthesis within a transmission electron microscope. This synthesis results in Sbl_3 nanotubes, observed either in a hollow core of WS_2 ones (Sbl_3@WS_2 nanotubes), or atop of them {WS_2@Sbl_3 nanotubes). The second technique involves a gaseous phase reaction, where the layered product employs WS_2 nanotubes as nucleation sites. In this case, the MoS_2 layers most often cover the WS_2 nanotube, resulting in WS_2@MoS_2 core-shell nanotubes. Notably, superstructures of the form MoS_2@WS_2@MoS_2 are occasionally obtained. Using a semi-empirical model, it is shown that the Pbl_2 nanotubes become stable within the core of MoS_2 nanotubes only above a critical core diameter of the host (>12 nm); below this diameter the Pbl_2 crystallizes as nanowires. These model calculations are in agreement with the current experimental observations, providing further support to the growth mechanism of such core-shell nanotubes.
机译：自1992年问世以来，与无机纳米管合成相关的新材料和技术一直在不断增加。最近，通过毛细管湿法工艺将大量生产的WS_2纳米管填充了熔融的碘化铅盐，产生Pbl_2 @ WS_2核壳纳米管。这项工作的特点是在合成新的核壳纳米管方面取得了进展，包括以类似方式生产的Bil_3 @ WS_2纳米管。另外，提出了两种获得核-壳纳米管的新技术。第一种是通过电子束辐照，即在透射电子显微镜内原位合成。这种合成产生Sbl_3纳米管，可以在WS_2空心管（Sbl_3 @ WS_2纳米管）中或在其顶部（WS_2 @ Sbl_3纳米管）中观察到。第二种技术涉及气相反应，其中层状产品使用WS_2纳米管作为成核位点。在这种情况下，MoS_2层通常覆盖WS_2纳米管，从而形成WS_2 @ MoS_2核-壳纳米管。值得注意的是，偶尔会获得MoS_2 @ WS_2 @ MoS_2形式的上层建筑。使用半经验模型显示，Pbl_2纳米管仅在主体的临界核心直径（> 12 nm）以上才在MoS_2纳米管的核心内稳定。在该直径以下，Pbl_2结晶为纳米线。这些模型计算与当前的实验观察结果一致，为此类核壳纳米管的生长机理提供了进一步的支持。

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  • 来源
    《Advanced Functional Materials》 |2010年第15期|P.2459-2468|共10页
  • 作者

    Ronen Kreizman; rnAndrey N. Enyashin; rnFrancis Leonard Deepak; rnAna Albu-Yaron; rnRonit Popovitz-Biro; rnGotthard Seifert; rnReshef Tenne;

  • 作者单位

    The Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel);

    rnPhysical Chemistry, Technical University Dresden 01062 Dresden (Germany) Institute of Solid State Chemist7 UB RAS 620990 Ekaterinburg (Russia);

    rnThe Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel) International Iberian Nanotechnology Laboratory, Avda Mestre Jose Veiga Braga 4715 (Portugal);

    rnThe Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel);

    rnThe Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel);

    rnPhysical Chemistry, Technical University Dresden 01062 Dresden (Germany);

    rnThe Department of Materials and Interfaces, Weizmann Institute of Science Rehovot 76100 (Israel);

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