Fe掺杂碳纳米管吸附Al原子的第一性原理研究

摘要

采用第一性原理对Al原子在本征(5,5)型及Fe掺杂(5,5)型碳纳米管的吸附行为进行研究,研究掺杂Fe前后碳纳米管吸附Al的吸附能、能带结构和电荷分布情况.计算结果表明:掺杂Fe能够增强Al在(5,5)型碳纳米管表面的吸附能,提高Al与碳纳米管之间的电荷转移.这主要是因为掺杂Fe原子后,Fe原子与Al原子之间形成共价键结合,Al与碳纳米管之间由物理吸附转变为化学吸附.此类掺杂有望改善Al基碳纳米管复合材料界面的电接触性能.%The first principles theory was applied to investigate the adsorption behavior of Al on pristine and Fe-doped (5,5) CNTs. The computation results of adsorption energy, energy band structure, and charge distribution of the pristine and Fe-doped (5,5) CNTs reveal that doping Fe atoms increases adsorption energy of Al atoms on (5,5) CNTs and enhances the charge transfer between Al atoms and CNTs. The improvement is mainly due to the formation of covalent bonds between Fe and Al atoms, leading to a chemical adsorption between Al and CNTs instead of a physical one. Fe doping could be beneficial to improving electrical contact behavior of CNT-reinforced Al matrix composites.