多壁碳纳米管气-固-固生长机理的参数研究,Materials Chemistry and Physics

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多壁碳纳米管气-固-固生长机理的参数研究
Materials Chemistry and Physics ( IF 4.3 ) Pub Date : 2016-06-01 , DOI: 10.1016/j.matchemphys.2016.03.013
S. Shukrullah , N.M. Mohamed , M.S. Shaharun , M.Y. Naz

摘要本研究旨在研究流化床化学气相沉积 (FBCVD) 工艺参数对多壁碳纳米管 (MWCNT) 的生长机制、形态和纯度的影响。纳米管是在立式 FBCVD 反应器中通过在不同流速下在 Al 2 O 3 负载的纳米铁催化剂芽上催化分解乙烯来生产的。FESEM、TEM、拉曼光谱和 TGA 热谱图用于详细说明生长的 MWCNT 的生长参数。由于生长过程是由远低于铁碳共晶温度 (1147 °C) 的过程温度驱动的，因此催化剂颗粒晶面出现的石墨片表明在 CNT 成核过程中催化剂呈固体形式。预测了具有非常低的活化能的 MWCNT 成核的气-固-固 (VSS) 生长机制。在优化的温度和乙烯流速下生长的纳米管具有高石墨对称性、纯度、窄直径分布和更短的层间距。在拉曼和 TGA 分析中，小的 ID /IG 比和残留质量表明产品中结构缺陷和无定形碳的比例可以忽略不计。然而，在未优化的工艺参数下生长的纳米管中发现了一些结构缺陷和杂质元素。小的 ID /IG 比率和残余质量表明产品中结构缺陷和无定形碳的比率可以忽略不计。然而，在未优化的工艺参数下生长的纳米管中发现了一些结构缺陷和杂质元素。小的 ID /IG 比率和残余质量表明产品中结构缺陷和无定形碳的比率可以忽略不计。然而，在未优化的工艺参数下生长的纳米管中发现了一些结构缺陷和杂质元素。

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Parametric study on vapor-solid-solid growth mechanism of multiwalled carbon nanotubes

Abstract This study aimed at investigating the effect of the fluidized bed chemical vapor deposition (FBCVD) process parameters on growth mechanism, morphology and purity of the multiwalled carbon nanotubes (MWCNTs). Nanotubes were produced in a vertical FBCVD reactor by catalytic decomposition of ethylene over Al 2 O 3 supported nano-iron catalyst buds at different flow rates. FESEM, TEM, Raman spectroscopy and TGA thermograms were used to elaborate the growth parameters of the as grown MWCNTs. As the growth process was driven by the process temperatures well below the iron-carbon eutectic temperature (1147 °C), the appearance of graphite platelets from the crystallographic faces of the catalyst particles suggested a solid form of the catalyst during CNT nucleation. A vapor-solid-solid (VSS) growth mechanism was predicted for nucleation of MWCNTs with very low activation energy. The nanotubes grown at optimized temperature and ethylene flow rate posed high graphitic symmetry, purity, narrow diameter distribution and shorter inter-layer spacing. In Raman and TGA analyses, small I D /I G ratio and residual mass revealed negligible ratios of structural defects and amorphous carbon in the product. However, several structural defects and impurity elements were spotted in the nanotubes grown under unoptimized process parameters.

更新日期：2016-06-01

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