异型碳纳米管

通过引入缺陷环，直型碳纳米管可连接为不同形态的异型碳纳米管。异型碳纳米管因其在纳米电子科技领域潜在的应用而备受关注。本文综述了异型碳纳米管的合成方法，结构和稳定性的关系，其电学、力学、热学、光学性质以及相关的分子模拟方法在异型碳纳米管研究中的应用进展，并简要介绍了其在电子器件，储氢材料以及其它功能复合材料方面的应用。最后，讨论了目前研究中存在的问题并展望了该领域今后的发展趋势。

Multi-Terminal Carbon Nanotubes Junctions

Straight carbon nanotubes can be connected into multi-terminal carbon nanotube junctions (MTCNTs) by the introduction of defect rings to the perfect hexagonal lattice. Typical MTCNTs include X-、Y-、and T-type junctions. Since the potential applications for the miniaturization of electronic devices, MTCNTs have attracted the attention of many researchers focusing on the preparations and properties both experimentally and theoretically. In this paper, the synthetic methods of MTCNTs, the relationship between the structure and stability, their electrical, mechanical, thermal and optical properties, as well as the applications of molecular simulation methods in the formation processes of MTCNTs, are summarized. IOur theoretical study on the formation of Y- and T-type junctions from multi-layered graphite flakes, and investigation on the structural stability of MTCNTs and the effect factors are also include. In addition, their possible applications in nano-electronic devices, hydrogen storage and functional materials are introduced. Furthermore, some questions and the research trends of MTCNTs are discussed.