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首页> 外文期刊>Applied Surface Science >Diameter-dependent thermal-oxidative stability of single-walled carbon nanotubes synthesized by a floating catalytic chemical vapor deposition method
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Diameter-dependent thermal-oxidative stability of single-walled carbon nanotubes synthesized by a floating catalytic chemical vapor deposition method

机译：浮动催化化学气相沉积法合成的单壁碳纳米管的直径依赖性热氧化稳定性

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摘要

In this paper, purified single-walled carbon naotubes (SWCNTs) with three different diameters were synthesized using a floating catalytic chemical vapor deposition method with ethanol as carbon feedstock, ferrocene as catalyst, and thiophene as growth promoter. The thermal-oxidative stability of different-diameter SWCNTs was studied by using thermal analysis (TG, DTA), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analysis. The results indicate that small diameter SWCNTs (~1 nm) are less stable and burn at lower temperature (610°C), however, the larger diameter SWCNTs (~5nm) survive after burning at higher temperature (685 °C), the oxidation rate varies inversely with the tube diameter of SWCNTs, which may be concluded that the higher oxidation-resistant temperature of larger diameter SWCNTs can be attributed to the lower curvature-induced strain by rolling the planar graphene sheet for the larger diameter, so small tubes will become thermodynamically unstable.
机译：以乙醇为碳原料，二茂铁为催化剂，噻吩为生长促进剂，采用浮式催化化学气相沉积法合成了三种直径的纯净单壁碳纳米管（SWCNTs）。通过热分析（TG，DTA），透射电子显微镜（TEM）和X射线光电子能谱（XPS）分析研究了不同直径的SWCNT的热氧化稳定性。结果表明，小直径的SWCNT（〜1 nm）不稳定，在较低温度（610°C）下燃烧，但是，较大直径的SWCNT（〜5nm）在较高温度（685°C）下燃烧后仍然存在。速率随SWCNTs的管径成反比，这可以得出结论，较大直径的SWCNTs的较高的抗氧化温度可归因于将平面石墨烯片卷成较大的直径，从而降低了曲率引起的应变，因此较小的管子将变得热力学不稳定。

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  • 来源
    《Applied Surface Science》 |2011年第24期|p.10471-10476|共6页
  • 作者

    Jie Ma; Fei Yu; Zhiwen Yuan; JunhongChen;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

    School of Environmental Science and Engineering, Shanghai fiao Tong University, 800 Dong Chuan Road, Shanghai 200240, China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China ,Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, Wl 53211, USA;

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  • 关键词

    diameter-dependent thermal stability single-walled carbon nanotubes;

    机译：直径相关的热稳定性单壁碳纳米管;

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