流化床中超长碳纳米管阵列的自组织生长机制及结构调控

项目名称： 流化床中超长碳纳米管阵列的自组织生长机制及结构调控

项目编号： No.21306102

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 化学工业

项目作者： 张强

作者单位： 清华大学

项目金额： 25万元

中文摘要： 具有一致取向、巨大长径比、高纯度、易分散特性的超长碳纳米管阵列由于宏观尺度上优异的力学、电学、热学等性能而在力学增强、能源存储、电子器件等领域具有广阔应用前景。目前，碳纳米管阵列基于平整基板的传统常规催化合成路线中基板比表面积受到极大限制，而流化床反应器中插层生长所得碳纳米管阵列长度较短，大批量制备超长碳纳米管阵列面临现实的理论及技术瓶颈，极大地限制了高端碳纳米管材料的性能和应用研究。本课题拟以层状双羟基金属氢氧化物为催化剂，通过探究颗粒尺寸上碳纳米管的自组装生长机制、磁场强化的跨尺度作用方式、流化床中原子尺度上金属催化剂的形核以及设备尺度上的流动反应对颗粒尺度上碳纳米管的相互作用机理，实现颗粒尺度上片状催化剂之间位阻调控，在此基础上通过高效化学气相沉积过程原位组装获得超长碳纳米管阵列。课题研究有望在基础以及应用方面为碳纳米管及其他纳米材料的气相催化生长提供新思路。

中文关键词： 流化床；水滑石；碳纳米管；石墨烯；金属催化

英文摘要： The superlong vertically aligned carbon nanotube (CNT) arrays are with advantages of good orientation, large aspect ratio, high purity, and well dispersion, therefore, the superlong CNT arrays afford extraordinary mechanical, electronic, and thermal properties, as well as promising bulk applications in the area of high performance nanocomposites, energy storage, electronic devices, and so on. However, the superlong CNTs are unavailable in large amount, which is attributed from the limited growth area of plate substrates for routine chemical vapor deposition (CVD) and/or limited growth space for intercalated growth on lamellar flakes in fluidized bed CVD. In the present project, the layered double hydroxide flakes are selected as the catalysts and superlong CNT arrays are self organized by fluidized bed CVD. On each LDH flake, CNTs are self organized into aligned arrays at mesoscale, and the magnetic field is employed to mediate the distribution of individual catalyst particle. The relationships between the metal catalyst nanoparticle formation, the multiphase flow/heterogeneous reaction and the self assembly of CNTs are investigated to understand the principle for large scale synthesis of superlong CNT arrays in a fluidized bed reactor. The investigation of the project can provide new insight on the catalytic C

英文关键词： fluidized bed；layered double hydroxides；carbon nanotubes；graphene；metal catalysis