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Catalyst-Free Synthesis and Characterization of Metastable Boron Carbide Nanowires

机译：亚稳碳化硼纳米线的无催化剂合成与表征

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摘要

Catalyst-free growth of boron carbide nanowires is achieved by pyrolysis of diborane and methane at 650-750 ℃ and around 500 mTorr in a quartz tube furnace. Electron-diffraction analysis using a novel diffraction-scanning transmission electron microscopy (D-STEM) technique indicates that the crystalline nanowires are single-crystal orthorhombic boron carbide. TEM images show that the nanowires are covered by a 1-3 nm thick amorphous layer of carbon. Elemental analysis by electron energy loss spectroscopy (EELS) shows only boron and carbon while energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) show the presence of oxygen as well as boron and carbon.
机译：碳化硼纳米线的无催化剂生长是通过在石英管炉中于650-750℃和500 mTorr左右热解乙硼烷和甲烷实现的。使用新型衍射扫描透射电子显微镜（D-STEM）技术进行的电子衍射分析表明，晶体纳米线是单晶斜方碳化硼。 TEM图像显示纳米线被1-3 nm厚的碳非晶层覆盖。通过电子能量损失光谱仪（EELS）进行的元素分析仅显示了硼和碳，而能量色散X射线光谱仪（EDX）和X射线光电子能谱仪（XPS）显示了氧以及硼和碳。

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  • 来源
    《Advanced Functional Materials》 |2009年第24期|3926-3933|共8页
  • 作者

    Aruna Velamakanni; K.J. Ganesh; Yanwu Zhu; Paulo J. Ferreira; Rodney S. Ruoff;

  • 作者单位

    Department of Mechanical Engineering and Texas Materials Institute University of Texas at Austin 1 University Station, C 2200, Austin, Texas, 78712 (USA);

    Materials Science and Engineering Program University of Texas at Austin 1 University Station, C 2200, Austin, Texas, 78712 (USA);

    Department of Mechanical Engineering and Texas Materials Institute University of Texas at Austin 1 University Station, C 2200, Austin, Texas, 78712 (USA);

    Department of Mechanical Engineering and Texas Materials Institute University of Texas at Austin 1 University Station, C 2200, Austin, Texas, 78712 (USA);

    Department of Mechanical Engineering and Texas Materials Institute University of Texas at Austin 1 University Station, C 2200, Austin, Texas, 78712 (USA);

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