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首页> 外文期刊>Applied Surface Science >Structural and morphological dependence of carbon nanotube arrays on catalyst aggregation
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Structural and morphological dependence of carbon nanotube arrays on catalyst aggregation

机译：碳纳米管阵列对催化剂聚集的结构和形态依赖性

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摘要

Catalyst aggregation affects the growth of carbon nanotube (CNT) arrays in terms of tubular structures, waviness, entanglement, lengths, and growth density etc., which are important issues for application developments. We present a systematic correlation between the aggregation of catalyst on the SiO_2/Si substrate and the structure and morphology of CNT arrays. The thickness of the catalyst film has a direct effect on the areal density of the catalytic particles and then the alignment of the CNT array. Introducing alumina as buffer layer and annealing the catalyst film at low pressure are two effective approaches to downsize the catalyst particles and then the diameter, wall number of the CNTs. Both the size and areal density of the catalyst also change with the CNT growth in accordance with Ostwald ripening process, with the bottom of the CNT array varying from well-aligned to disordered and adhesion between catalyst particles and the substrate getting enhanced. Strategies including tuning the thickness of the catalyst film, changing buffer layer, controlling on the growth time and the system pressure were used to regulate the aggregation of the catalyst. CNT arrays from disordered to well-aligned, from multi-walled to few-walled and further to single-walled were reproducibly synthesized by chemical vapor deposition of acetylene.
机译：催化剂聚集在管状结构，波纹度，缠结，长度和生长密度等方面影响碳纳米管（CNT）阵列的生长，这是应用程序开发的重要问题。我们提出了催化剂在SiO_2 / Si衬底上的聚集与CNT阵列的结构和形态之间的系统相关性。催化剂膜的厚度直接影响催化颗粒的面密度，进而影响CNT阵列的排列。引入氧化铝作为缓冲层并在低压下对催化剂膜进行退火是减小催化剂颗粒尺寸，然后减小CNT直径，壁数的两种有效方法。催化剂的尺寸和面密度都随奥斯特瓦尔德（Ostwald）成熟过程而随CNT的生长而变化，CNT阵列的底部从良好排列到无序变化，并且催化剂颗粒与基材之间的附着力得到增强。包括调节催化剂膜的厚度，改变缓冲层，控制生长时间和系统压力的策略用于调节催化剂的聚集。通过无规乙炔的化学气相沉积可重复合成从无序到排列良好，从多壁到少壁，再到单壁的CNT阵列。

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  • 来源
    《Applied Surface Science》 |2011年第1期|p.13-18|共6页
  • 作者

    Jiang-Tao Di; Zhen-Zhong Yong; Xiao-Jie Yang; Qing-Wen Li;

  • 作者单位

    Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, People's Republic of China, Graduate University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China;

    Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, People's Republic of China;

    Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, People's Republic of China;

    Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, People's Republic of China;

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

    carbon nanotube; chemical vapor deposition; catalyst; pressure; aggregation;

    机译：碳纳米管化学气相沉积;催化剂;压力;聚合;

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