Modulation of the Work Function of Capped Single-Walled Carbon Nanotube by Alkali-Metal Adsorption: A Theoretical Study

Modulation of the Work Function of Capped Single-Walled Carbon Nanotube by Alkali-Metal Adsorption: A Theoretical Study
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碱金属吸附调节封端单壁碳纳米管功函数的理论研究

DOI:
10.1021/jp200885m
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发表时间:
2011-04
影响因子:
3.7
通讯作者:
Mimura, Hidenori
Mimura, Hidenori
中科院分区:
化学3区
文献类型:
--
作者:
Xu, Shun-Fu;Yuan, Guang;Li, Chun;Liu, Wei-Hui;Mimura, Hidenori

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通过第一性原理计算研究了碱金属(Li/Na/Cs)吸附对带封端的(5, 5)和(9, 0)单壁碳纳米管(CNT)功函数的影响。吸附碱金属后,(5, 5)和(9, 0)碳纳米管的功函数减小,并随元素的电负性线性变化,但吸附碱原子的位置对功函数影响很大。然而,帽上的任何空位缺陷都会提高碳纳米管的功函数。功函数的变化主要归因于电荷重新分布引起的费米能级的变化。此外,碱金属吸附可以提高CNT混合物的电导率。
The influence of alkali-metal (Li/Na/Cs) adsorption on work functions of (5, 5) and (9, 0) single-walled carbon nanotubes (CNTs) with a capped edge was investigated by first-principles calculations. After alkali-metal adsorption, the work functions of (5, 5) and (9, 0) CNTs decrease and vary linearly with the electronegativity of the element, but the positions where the alkali atom is adsorbed considerably influence the work functions. However, any vacancy defect on the cap raises the work functions of the CNTs. The variations in the work functions are mainly attributed to changes in the Fermi levels induced by charge redistributions. Additionally, alkali-metal adsorption can improve the electric conductivity of a CNT mixture.
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