Electronic Properties of Carbon- and Nitrogen-Sustituted Nanotubes

在这项研究中，我们进行了碳和氮取代的纳米管的特性。这项研究（1995 -1997年）的结果说明如下。（1）虽然理论上预计碳纳米管和聚并苯会表现出金属性质，但在一维系统中总是存在广泛观察到的金属-绝缘体转变的可能性。因此，我们预测了碳纳米管和聚菲的电子性质。结果表明，费米能级附近的晶体轨道与金属性质有密切的关系。(2)We采用热处理法提纯碳纳米管，并进行了电子自旋共振和SQUID测量。从这些测量中可以看出，碳纳米管表现出与石墨一样的金属特性。

In this study, we have carried out characteristics of carbon- and nitrogen-substituted nanotubes. Results of this study (19995-1997) are described below.(1)Although carbon nanotubes and polyacenes are theoretically expected to exhibit metallic properties, there is always a possibility of metal-insulator transition widely observed in one-dimensional systems. Thus, we predicted the electronic properties of carbon nanotubes and polyphenanthrenes. As a result we showed that there is a close correlation between the crystal orbitals near the Fermi level and the metallic properties.(2)We purified using a heat-treatment method carbon nanotubes, and conducted electron spin resonance and SQUID measurements. Carbon nanotubes are shown to exhibit metallic properties just like graphite from these measurements.