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Effects of intercalation and inhomogeneous filling on the collapse pressure of double-wall carbon nanotubes

机译：插层和不均匀填充对双壁碳纳米管塌陷压力的影响

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摘要

The vibrational and structural properties of modified double-wall carbon nanotubes (DWNTs) were investigated by high-pressure resonance Raman scattering. We studied bromine-intercalated DWNTs grown by chemical vapor deposition (CVD) and ~(13)C_6o peapod-derived DWNTs in comparison with pristine CVD-grown DWNTs. The effects of chemical modification, carbon interwall geometry, and inhomogeneous filling on the high-pressure evolution of the DWNTs have been investigated. We find that the mechanical resistance of the DWNT system is affected both in the case of bromine-intercalated CVD-DWNTs and also for the ~(13)C~(60) peapod-derived DWNTs, thus lowering the onset of collapse pressure P_c~(onest) compared with pristine CVD-DWNTs. For bromine CVD-DWNTs, P_c~(onest) was observed to be 13 GPa, well below the 21 GPa found for pristine CVD-DWNTs. Uniaxial constrains in the interstitial regions of the DWNT bundle due to the presence of bromine arrangements explains this mechanical instability rather than a charge transfer process. Isotopic ~(13)C enrichment of the inner tube reduces the frequency of its tangential contribution to the G-band Raman spectrum, which appears to be an effective method to separate the contribution of inner- and outer-tube G~+ components during pressure evolution. P_c~(onest) was found to be 12 GPa for the ~(13)C_(60)-derived DWNT system. In this case, the instability of the DWNT is mainly due to the high inhomogeneous filling of the outer tube, as a consequence of the conversion method used to produce the inner-wall nanotube from the peapods, which produces inner tubes which are usually shorter than the outer tubes, leading to the outer tube not being completely filled.
机译：通过高压共振拉曼散射研究了改性双壁碳纳米管（DWNTs）的振动和结构性能。我们研究了与原始CVD生长的DWNT相比，通过化学气相沉积（CVD）和〜（13）C_6o豌豆衍生的DWNT生长的溴嵌入DWNT。研究了化学改性，碳壁间几何形状和不均匀填充对DWNTs高压演化的影响。我们发现DWNT系统的机械阻力在溴嵌入CVD-DWNT的情况下以及〜（13）C〜（60）豆荚类DWNT的情况下均受到影响，从而降低了塌陷压力P_c〜 （原始）与原始CVD-DWNT相比。对于溴CVD-DWNT，观察到的P_c_（onest）为13 GPa，远低于原始CVD-DWNT的21 GPa。由于存在溴排列，DWNT束间隙区域中的单轴约束解释了这种机械不稳定，而不是电荷转移过程。内管的同位素〜（13）C富集降低了其对G带拉曼光谱的切向贡献的频率，这似乎是分离压力期间内管和外管G〜+组分贡献的有效方法。演化。对于来自（13）C_（60）的DWNT系统，发现P_c〜（onest）为12 GPa。在这种情况下，DWNT的不稳定性主要归因于外管的高度不均匀填充，这是用于从豌豆荚生产内壁纳米管的转化方法的结果，而豌豆荚产生的内管通常短于外管，导致外管未完全充满。

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  • 来源
    《Physical review》 |2012年第19期|195410.1-195410.10|共10页
  • 作者

    A. L. Aguiar; A. San-Miguel; E. B. Barros; M. Kalbac; D. Machon; Y. A. Kim; H. Muramatsu; M. Endo; A. G. Souza Filho;

  • 作者单位

    Departamento de Fi'sica, Universidade Federal do Ceard, 60455-900 Fortaleza, Ceard, Brazil,Universite de Lyon, F-69000, France, Universite Lyon 1, Laboratoire PMCN, CNRS, UMR 5586, F-69622 Villeurbanne Cedex, France;

    Universite de Lyon, F-69000, France, Universite Lyon 1, Laboratoire PMCN, CNRS, UMR 5586, F-69622 Villeurbanne Cedex, France;

    Departamento de Fi'sica, Universidade Federal do Ceard, 60455-900 Fortaleza, Ceard, Brazil;

    J. Heyrovsky Institute of Physical Chemistry, Prague, Czech Republic;

    Universite de Lyon, F-69000, France, Universite Lyon 1, Laboratoire PMCN, CNRS, UMR 5586, F-69622 Villeurbanne Cedex, France;

    Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-8553, Japan;

    Research Center for Exotic Nanocarbons (JST), Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-8553, Japan;

    Research Center for Exotic Nanocarbons (JST), Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-8553, Japan;

    Departamento de Fi'sica, Universidade Federal do Ceard, 60455-900 Fortaleza, Ceard, Brazil;

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