TEM Study of Growth Mechanism and Production of Carbon Nanotubes

小行星9302353 该项目涉及微米长的石墨纤维（称为纳米管）的研究。 与最初观察到的球形富勒烯（如C60）相比，这些纳米管表现出不同的形状。 本项目的目标是：1）通过透射电子显微镜研究纳米管的形态和产量与工艺参数之间的关系; 2）纳米管的生长机制，目的是控制碳管和端件的圆柱几何形状中碳六边形和五边形的复杂平衡，并定制所需的长径比的纳米管;以及3）纳米管在电子束下以及在加热和冷却时原位的稳定性和结构转变。 该研究为管状碳团簇的纳米工程化奠定了基础。 该项目具有技术上的重要性，在适当设计的纳米管基材料中预期的新的机械和电气性能。 ***

9302353 Seraphin This project is concerned with the investigation of micron-long graphite fibers called nanotubes. These nanotubes exhibit a different shape compared to the initially observed spherical fullerenes such as C60. The objectives of this project are to study: 1) the correlation between morphology and yield of nanotubes and processing parameters by means of transmission electron microscopy; 2) the growth mechanism of the nanotubes with the aim to control the intricate balance of carbon hexagons and pentagons in the cylindrical geometry of the tubes and end pieces, and to tailor nanotubes of desired length-to-diameter ratio; and 3) stability and structural transformations of nanotubes under the electron beam and in-situ upon heating and cooling. This research will lay the foundations for the nanoscale engineering of the tubular carbon clusters. The project has technological importance with respect to the novel mechanical and electrical properties expected in properly designed nanotube-based materials. ***