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ConCm±(n=1-5;m=1,2)团簇的密度泛函理论研究 被引量:2

Density-functional theory study of ConCm±(n = 1-5,m = 1,2) clusters
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摘要 本文采用基于自旋极化的密度泛函理论系统研究了ConCm±(n=1-5;m=1,2)团簇的几何结构和电子结构特性.将ConCm±(n=1-5;m=1,2)团簇中的一个Co替换为C原子,个体的基态几何结构发生明显变化;在ConCm±(n=1-5)团簇的生长序列中,发现从n=3开始团簇中的两个C原子有彼此分离分布的趋势,本文分析,这是Co金属能够维持单壁碳纳米管(SCNTs)保持开口生长,成为非常有效的一种催化剂的重要原因.同时,将ConC±(n=2—5)团簇中添加一个Co原子后系统的总磁矩出现大幅下降的趋势,但仍保持奇偶交替的规律.通过比较中性及带电的ConC以及ConC2(n=1—5)团簇的碎裂能,本工作发现:由实验获取的SCNTs应均为带正电的体系,这一结论与已有的实验模型拟合得很好. The geometrical and electronic structures of ConCm±(n = 1—5,m = 1,2) clusters are investigated using spin-polarized DFT calculations.ConC±(n = 2—5) and ConC2±(n = 1—4) clusters of their ground-state structures different.From n = 3,two C atoms are located apart from each other,we think,it is an important reason for Co catalyze C in to single walled carbon nanotubes effectively. The total magnetic moment of ConC2±(n = 2—5) are lower than those of ConC±(n = 2—5) clusters,and they both alternated with odd and even numbers.By comparing the fragmentation energies of neutral and charged ConC and ConC2(n = 1—5) clusters,we conclude that the single walled carbon nanotubes obtained in experiment is electropositive.This conclusion is in good agreement with that from expersimental model
出处 《物理学报》 SCIE EI CAS CSCD 北大核心 2012年第15期183-188,共6页 Acta Physica Sinica
基金 国家自然科学基金(批准号:10864005) 新疆维吾尔自治区高校科研计划(批准号:050161) 新疆大学2008年院校联合项目(批准号:07.02.0419)资助的课题~~
关键词 Co-C团簇 密度泛函理论 电子结构 Co-C cluster; density-functional theory; electronic structures
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