• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Synchronous growth of vertically aligned carbon nanotubes with pristine stress in the heterogeneous catalysis process
【24h】

Synchronous growth of vertically aligned carbon nanotubes with pristine stress in the heterogeneous catalysis process

机译：非均相催化过程中垂直排列的碳纳米管与原始应力的同步生长

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The formation of a vertically aligned carbon nanotube (VA-CNT) array in a floating catalyst process was described as a synchronous growth that resulted from the interaction of fast growth and slow growth CNTs. The array growth was characterized by the observations that straight and curved CNTs were formed during growth, and the tortuosity change of the curved CNTs and a G band Raman shift during growth. These were used to deduce that pristine stress was present in the CNTs. A model of the stresses as caused by space limitation and different growth rates was used to explain the development of a synchronous growth of the VA-CNT array. The tortuosity of the curved CNTs and Raman shift decreased and were constant after the growth of a certain length of the array, indicating that constant stresses were maintained in the growing array after the growth of this length. This indicated that an ordered CNT structure was formed and a transition from random structure to ordered structure growth had taken place in the growth. The transition was explained by a thermodynamic argument using the Onsager virial theory. Based on the vapor-liquid-solid model and bottom up growth for a single CNT, the description of a synchronous growth made possible by existent stresses gives a view that accounts for the interaction between CNTs in an array, and it can provide guidelines for a more precise control of the array structure.
机译：浮动催化剂过程中垂直排列的碳纳米管（VA-CNT）阵列的形成被描述为同步生长，这是由快速生长和缓慢生长的CNT相互作用引起的。阵列生长的特征是观察到在生长过程中形成了直的和弯曲的CNT，并且在生长过程中弯曲的CNT的曲折度变化和G带拉曼位移。这些被用来推断在碳纳米管中存在原始应力。由空间限制和不同的生长速率引起的应力模型用于解释VA-CNT阵列同步生长的发展。弯曲的CNT的曲折度和拉曼位移降低，并且在一定长度的阵列生长后保持不变，这表明在此长度增长之后，正在生长的阵列中保持了恒定的应力。这表明形成了有序的CNT结构，并且在生长过程中发生了从无规结构向有序结构生长的转变。使用昂萨格病毒理论通过热力学论据解释了这种转变。基于单个CNT的气-液-固模型和自下而上的生长，通过存在的应力使同步生长成为可能的描述给出了一种观点，该观点说明了阵列中CNT之间的相互作用，并且可以为更精确地控制数组结构。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号