有限长Y型碳纳米管结构和性质的第一性原理研究  

First-principle Theoretical Study of Structures and Properties of Finite-length Y-shaped Carbon Nanotubes

作　　者：薛冰纯[1] 蔡文生[1] 邵学广[1] 

机构地区：[1]南开大学化学学院,天津300071

出　　处：《高等学校化学学报》2008年第12期2407-2412,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20573102)资助

摘　　要：采用密度泛函理论的GGA/PW91方法对有限长Y型碳纳米管的结构和性质进行了研究.研究结果表明,由于缺陷环的影响,Y型碳纳米管与直型管的性质明显不同,而且,Y型碳纳米管的结构和性质与分支管长度存在一定的关系.当分支管长度大于1nm时,Y型碳纳米管的结构、能隙和电学性质均出现周期性振荡变化的趋势.The geometry and electronic structure of finite-length（4,4）Y-shaped carbon nanotubes（CNTs）were investigated using density functional theory with GGA-PW91 method.The results indicate that the difference between the Y-shaped CNT and the pristine one is remarkable due to the influence of the defects in the junctions of the former.Furthermore,the structures and properties of Y-shaped CNTs are found to be rela-ted to the length of the CNT branch.By comparing the properties of the Y-shaped CNTs with different lengths,the length-dependent oscillation behavior including structure,energy gap and electronic property were observed when the length is longer than 1 nm.

关 键 词：有限长Y型碳纳米管 几何结构 电子结构和性质 

分 类 号：O641[理学—物理化学]