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Aligned synthesis of multi-walled carbon nanotubes with high purity by aerosol assisted chemical vapor deposition: Effect of water vapor

机译:气溶胶辅助化学气相沉积定向合成高纯度多壁碳纳米管:水蒸气的影响

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摘要

Aligned multi-walled carbon nanotubes (MWCNTs) with high purity and bulk yield were achieved on a silicon substrate by an aerosol-assisted chemical vapor deposition. The introduction of specific amounts of water vapor played a key role in in situ controlling the purity and surface defects of the nanotubes. The morphology, surface quality and structure of MWCNTs were characterized by secondary and backscattered electron imaging in a field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). Crystallinity and defects of the MWCNTs' were investigated by high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. In this work, water vapor was found to provide a weak oxidative environment, which enhanced and purified the MWCNTs' growth. However, excessive water vapor would inhibit the MWCNTs growth with a poor surface quality. In addition, it has been found that the surface morphology of the CNTs can be modified intentionally through producing some surface defects by tuning the amount of the water vapor, which may offer more nucleation sites on the chemically inert CNT surface for various applications such as catalyst support.
机译:通过气溶胶辅助化学气相沉积在硅基板上实现了具有高纯度和高产量的取向多壁碳纳米管(MWCNT)。特定量的水蒸气的引入在原位控制纳米管的纯度和表面缺陷中起关键作用。在场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)中通过二次和反向散射电子成像对MWCNT的形貌,表面质量和结构进行了表征。通过高分辨率透射电子显微镜(HRTEM)和拉曼光谱研究了MWCNT的结晶度和缺陷。在这项工作中,发现水蒸气提供了弱的氧化环境,从而增强和净化了MWCNT的生长。但是,过多的水蒸气会抑制MWCNT的生长,且表面质量较差。另外,已经发现可以通过调节水蒸气的量通过产生一些表面缺陷来有意地改变CNT的表面形态,这可以在化学惰性的CNT表面上提供更多的成核位点,以用于各种应用,例如催化剂。支持。

著录项

  • 来源
    《Applied Surface Science》 |2010年第14期|p.4692-4696|共5页
  • 作者单位

    Department of Mechanical and Materials Engineering. The University of Western Ontario. London, ON N6A 5B9, Canada;

    rnDepartment of Mechanical and Materials Engineering. The University of Western Ontario. London, ON N6A 5B9, Canada;

    rnDepartment of Mechanical and Materials Engineering. The University of Western Ontario. London, ON N6A 5B9, Canada;

    rnDepartment of Mechanical and Materials Engineering. The University of Western Ontario. London, ON N6A 5B9, Canada;

    rnDepartment of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada;

    rnDepartment of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada;

    rnDefence Research & Development Canada-Valcartier, 2459 Boulevard Pie-XI nord, Quebec, QC C3J 1X5, Canada;

    rnDefence Research & Development Canada-Valcartier, 2459 Boulevard Pie-XI nord, Quebec, QC C3J 1X5, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    catalysts; chemical vapor deposition; corrosion and oxidation; nanomaterials;

    机译:催化剂;化学气相沉积;腐蚀和氧化;纳米材料;

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