Influence of adsorbate and defect on structural and electronic properties of ultrathin silver nanotube

Influence of adsorbate and defect on structural and electronic properties of ultrathin silver nanotube
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吸附物和缺陷对超薄银纳米管结构和电子性能的影响

DOI:
10.1016/j.jpcs.2017.07.031
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发表时间:
2017-12
影响因子:
4
通讯作者:
Zhang Jian Min
Zhang Jian Min
中科院分区:
材料科学3区
文献类型:
--
作者:
Ma Liang Cai;Wang Xi Zhi;Ma Ling;Zhang Jian Min

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采用基于密度泛函理论的第一性原理计算方法,系统地研究了吸附物(CO分子、O和N原子)和缺陷(吸附原子和单空位)对最小(4,4)AgNT结构和电子性质的影响. CO吸附在Ag原子上时,CO和Ag原子之间通过施主-反馈过程形成了5σB/5σ a和2πB/2πa的成键/反键对,吸附CO后AgNT的量子电导降低了1G 0. O和N原子与AgNT发生强烈的相互作用,导致AgNT的量子电导分别下降了3G 0和2G 0。高吸附能的一个Ag原子的粘附和相对较低的单空位的形成能表明,这两种类型的缺陷很可能发生在AgNT的制造。当有一个Ag原子附着时,AgNT的量子电导保持不变,但当有一个单空位时,量子电导降低了1G 0。
Using first-principles calculations based on density-functional theory, the effects of adsorbates (CO molecule, O and N atoms) and defects (an adhered atom and a monovacancy) on structural and electronic properties of the smallest (4, 4) AgNT have been systematically investigated. For CO adsorption on energetically preferred top site, the donation–backdonation process between the CO and Ag states leads to the formation of bonding/antibonding pairs, 5σb/5σaand 2πb∗/2πa∗, and the quantum conductance of AgNT decreases by 1G0after CO adsorption. Both O and N atoms strongly interact with AgNT after adsorption, leading to a 3G0and 2G0of drop in quantum conductance, respectively, for the AgNT. High adsorption energy of adhesion of one Ag atom and relatively low formation energy of a monovacancy suggest that these two types of defects are likely to occur in the fabrication of AgNT. The quantum conductance of the AgNT remains unchanged for adhesion of one Ag atom, but decreases by 1G0when a monovacancy is present.
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