Carbon Nanotube( 탄소섬유)의 물리적 특징 및 발전방향

소개

탄소나노튜브에 대한 물리적, 광학적, 화학적 특성을 정리하고, 현재의 문제점, 앞으로의 적용분야에 대해 영어로 정리한 레포트 입니다.

▲ Introdubtion

Carbon nanotubes, long, thin cylinders of carbon, were discovered in 1991 by S. Iijima. These are large macromolecules that are unique for their size, shape, and remarkable physical properties. They can be thought of as a sheet of graphite (a hexagonal lattice of carbon) rolled into a cylinder. These intriguing structures have sparked much excitement in the recent years and a large amount of research has been dedicated to their understanding. Currently, the physical properties are still being discovered and disputed. What makes it so difficult is that nanotubes have a very broad range of electonic, thermal, and structural properties that change depending on the different kinds of nanotube (defined by its diameter, length, and chirality, or twist). To make things more interesting, besides having a single cylindrical wall (SWNTs), nanotubes can have multiple walls (MWNTs)--cylinders inside the other cylinders. This web site is an ongoing effort to provide researchers, students, and other interested scientists with a central location for the exchange of current knowledge and information. Carbon nanotubes are molecular-scale tubes of graphitic carbon with outstanding properties. They are among the stiffest and strongest fibres known, and have remarkable electronic properties and many other unique characteristics. For these reasons they have attracted huge academic and industrial interest, with thousands of papers on nanotubes being published every year. Commercial applications have been rather slow to develop, however, primarily because of the high production costs of the best quality nanotubes.

목차

▲ Introdubtion

▲ Properties of Carbon Nanobubes

― Equilibrium Structure
• Types of SWNTs
• Detailed Structure
• Ropes of Carbon Nanotubes
― Optical Properties
• The Fundamental Gap
• The Density of States and Spectroscopic Transitions
― Electrical Transport
• Ballistic Conductance
― Thermal Transport
• Thermal Conductivity
― Elastic Behavior
• Elastic Behavior
▲ Applications of CNT
― Use of CNT in Space
• Carbon Nanotube -Based Vacuum Microelectronics Devices
• High-Performance Carbon Nanotube -Based Composites
• Carbon Nanotube -Fiber Optic Skin Friction and Temperature Sensor
• In the future Space Elevator

▲ Conclusions

본문내용

▲ Properties of Carbon Nanobubes

<One end of a SWNT>
― Equilibrium Structure

Simply put, carbon nanotubes exist as a macro-molecule of carbon, analagous to a sheet of graphite (the pure, brittle form of cabon in your pencil lead) rolled into a cylinder. Graphite looks like a sheet of chicken wire, a tessellation of hexagonal rings of carbon. Sheets of graphite in our pencil lay stacked on top on one another, but they slide past each other and can be separated easily, which is how it is used for writing. However, when coiled, the carbon arrangement becomes very strong. In fact, nanotubes have been known to be up to one hundred times as strong as steel and almost two millimeters long. These nanotubes have a hemispherical "cap" at each end of the cylinder. They are light, flexible, thermally stabile, and are chemically inert. They have the ability to be either metallic or semi-conducting depending on the "twist" of the tube.

참고자료

· http://www.pa.msu.edu/cmp/csc/ntproperties/