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首页> 外文期刊>Japanese journal of applied physics >Synthesis and diameter control of vertically-aligned carbon nanotube growth from Langmuir-Blodgett films deposited Fe_3O_4@SiO_2 core-shell nanoparticles
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Synthesis and diameter control of vertically-aligned carbon nanotube growth from Langmuir-Blodgett films deposited Fe_3O_4@SiO_2 core-shell nanoparticles

机译：由Langmuir-Blodgett薄膜沉积的Fe_3O_4 @ SiO_2核壳纳米粒子的合成和垂直取向的碳纳米管生长的直径控制

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摘要

We synthesized Fe_3O_4 nanoparticles (NPs) and Fe_3O_4@SiO_2 core-shell NPs. Vertically-aligned carbon nanotubes (VA-CNTs) were grown from Fe_3O_4 NP monolayer and Fe_3O_4@SiO_2 core-shell NP monolayer, respectively, by thermal chemical vapor deposition (CVD). The monolayer was prepared on SiO_2/Si substrate by Langmuir-Blodgett (LB) technique. Fe_3O_4 NP monolayer was used as catalyst for CNT growth, and core-shell NP monolayer was used as catalyst for CNT growth, too. We found that Fe_3O_4 NP covered with SiO_2 shell was moved from the center to the surface of core-shell NP during pre-thermal process at thermal CVD. The CNT carpet height tended to increase with the increasing thermal annealing time and decreasing shell thickness. And the average diameter of CNTs grown from core-shell LB film was smaller than that of CNTs grown from Fe_3O_4 LB film, and average diameter of CNTs almost conformed to Fe_3O_4 core size with SiO_2 shell.
机译：我们合成了Fe_3O_4纳米颗粒（NPs）和Fe_3O_4 @ SiO_2核壳NPs。通过热化学气相沉积（CVD）分别从Fe_3O_4 NP单层和Fe_3O_4 @ SiO_2核-壳NP单层中生长出垂直排列的碳纳米管（VA-CNT）。通过Langmuir-Blodgett（LB）技术在SiO_2 / Si衬底上制备单层膜。 Fe_3O_4 NP单层被用作CNT生长的催化剂，核壳NP单层也被用作CNT生长的催化剂。我们发现，在热CVD的预热处理过程中，覆盖有SiO_2壳的Fe_3O_4 NP从中心移动到核壳NP的表面。 CNT地毯的高度倾向于随热退火时间的增加和壳体厚度的减小而增加。并且，由核-壳LB膜生长的CNT的平均直径小于由Fe_3O_4 LB膜生长的CNT的平均直径，并且CNT的平均直径几乎与具有SiO_2壳的Fe_3O_4的核尺寸一致。

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  • 来源
    《Japanese journal of applied physics》 |2014年第2s期|02BD09.1-02BD09.4|共4页
  • 作者

    Masaaki Ohashi; Takehiro Sugawara; Kohei Kawasaki; Masahito Kushida;

  • 作者单位

    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan;

    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan;

    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan;

    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan;

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