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Robust synthesis and continuous manufacturing of carbon nanotube forests and graphene films.

机译：碳纳米管森林和石墨烯薄膜的可靠合成和连续生产。

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摘要

Successful translation of the outstanding properties of carbon nanotubes (CNTs) and graphene to commercial applications requires highly consistent methods of synthesis, using scalable and cost-effective machines. This thesis presents robust process conditions and a series of process operations that will enable integrated roll-to-roll (R2R) CNT and graphene growth on flexible substrates.;First, a comprehensive study was undertaken to establish the sources of variation in laboratory CVD growth of CNT forests. Statistical analysis identified factors that contribute to variation in forest height and density including ambient humidity, sample position in the reactor, and barometric pressure. Implementation of system modifications and user procedures reduced the variation in height and density by 50% and 54% respectively.;With improved growth, two new methods for continuous deposition and patterning of catalyst nanoparticles for CNT forest growth were developed, enabling the diameter, density and pattern geometry to be tailored through the control of process parameters. Convective assembly of catalyst nanoparticles in solution enables growth of CNT forests with density 3-fold higher than using sputtered catalyst films with the same growth parameters. Additionally, laser printing of magnetic ink character recognition toner provides a large scale patterning method, with digital control of the pattern density and tunable CNT density via laser intensity.;A concentric tube CVD reactor was conceptualized, designed and built for R2R growth of CNT forests and graphene on flexible substrates helically fed through the annular gap. The design enables downstream injection of the hydrocarbon source, and gas consumption is reduced 90% compared to a standard tube furnace. Multi-wall CNT forests are grown continuously on metallic and ceramic fiber substrates at 33 mm/min. High quality, uniform bi- and multi-layer graphene is grown on Cu and Ni foils at 25 - 495 mm/min. A second machine for continuous forest growth and delamination was developed; and forest-substrate adhesion strength was controlled through CVD parameters.;Taken together, these methods enable uniform R2R processing of CNT forests and graphene with engineered properties. Last, it is projected that foreseeable improvements in CNT forest quality and density using these methods will result in electrical and thermal properties that exceed state-of-the-art bulk materials.
机译：成功地将碳纳米管（CNTs）和石墨烯的优异性能转化为商业应用，需要使用可扩展且具有成本效益的机器，高度一致的合成方法。本论文介绍了稳健的工艺条件和一系列工艺操作，这些工艺操作将使集成的卷对卷（R2R）CNT和石墨烯在柔性基板上生长。;首先，进行了全面的研究以建立实验室CVD生长的变化来源的CNT森林。统计分析确定了造成森林高度和密度变化的因素，包括环境湿度，反应堆中的样品位置和大气压力。系统修改和用户程序的实施分别使高度和密度的变化减少了50％和54％。随着生长的改善，开发了两种新的连续沉积和图案化碳纳米管森林生长用催化剂纳米粒子的方法，从而实现了直径和密度的提高通过控制工艺参数来调整图案几何形状。催化剂纳米颗粒在溶液中的对流组装使CNT森林的密度比使用具有相同生长参数的溅射催化剂薄膜高3倍。此外，磁性墨水字符识别墨粉的激光打印提供了一种大规模的图案化方法，可通过激光强度对图案密度和可调节的CNT密度进行数字控制。;概念化，设计并建造了同心管CVD反应器，用于CNT林的R2R生长石墨烯和柔性衬底上的石墨烯以螺旋方式穿过环形间隙。该设计可向下游注入烃源，与标准管式炉相比，气体消耗减少了90％。多壁CNT森林以33 mm / min的速度在金属和陶瓷纤维基材上连续生长。在Cu和Ni箔上以25-495 mm / min的速度生长高质量，均匀的双层和多层石墨烯。开发了第二台用于森林连续生长和分层的机器；总的来说，这些方法可以对具有设计特性的CNT森林和石墨烯进行均匀的R2R处理。最后，预计使用这些方法对CNT林的质量和密度的可预见的改善将导致其电学和热学性能超过最新的散装材料。

著录项

  • 作者

    Polsen, Erik S.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Mechanical.;Nanotechnology.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 202 p.
  • 总页数 202
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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