Damage of low-energy ion irradiation on copper nanowire: molecular dynamics simulation

doi:10.1088/1674-1056/19/3/036102

中国物理B ›› 2010, Vol. 19 ›› Issue (3): 36102-036102.doi: 10.1088/1674-1056/19/3/036102

Damage of low-energy ion irradiation on copper nanowire: molecular dynamics simulation

邹雪晴¹, 王宇钢¹, 薛建明²

(1)State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100861, China; (2)State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100861, China;Center for Applied Physics and Technology, Peking University, Beijing 100861, China

收稿日期:2009-03-14 修回日期:2009-08-26 出版日期:2010-03-15 发布日期:2010-03-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.~10675009).

Damage of low-energy ion irradiation on copper nanowire: molecular dynamics simulation

Zou Xue-Qing(邹雪晴)^a), Xue Jian-Ming(薛建明)^a)b)†, and Wang Yu-Gang(王宇钢)^a)

^a State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100861, China; ^b Center for Applied Physics and Technology, Peking University, Beijing 100861, China

Received:2009-03-14 Revised:2009-08-26 Online:2010-03-15 Published:2010-03-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.~10675009).

摘要/Abstract

摘要： Physical and chemical phenomena of low-energy ion irradiation on solid surfaces have been studied systematically for many years, due to the wide applications in surface modification, ion implantation and thin-film growth. Recently the bombardment of nano-scale materials with low-energy ions gained much attention. Comared to bulk materials, nano-scale materials show different physical and chemical properties. In this article, we employed molecular dynamics simulations to study the damage caused by low-energy ion irradiation on copper nanowires. By simulating the ion bombardment of 5 different incident energies, namely, 1~keV, 2~keV, 3~keV, 4~keV and 5~keV, we found that the sputtering yield of the incident ion is linearly proportional to the energies of incident ions. Low-energy impacts mainly induce surface damage to the nanowires, and only a few bulk defects were observed. Surface vacancies and adatoms accumulated to form defect clusters on the surface, and their distribution are related to the type of crystal plane, e.g. surface vacancies prefer to stay on (100) plane, while adatoms prefer (110) plane. These results reveal that the size effect will influence the interaction between low-energy ion and nanowire.

Abstract: Physical and chemical phenomena of low-energy ion irradiation on solid surfaces have been studied systematically for many years, due to the wide applications in surface modification, ion implantation and thin-film growth. Recently the bombardment of nano-scale materials with low-energy ions gained much attention. Comared to bulk materials, nano-scale materials show different physical and chemical properties. In this article, we employed molecular dynamics simulations to study the damage caused by low-energy ion irradiation on copper nanowires. By simulating the ion bombardment of 5 different incident energies, namely, 1 keV, 2 keV, 3 keV, 4 keV and 5 keV, we found that the sputtering yield of the incident ion is linearly proportional to the energies of incident ions. Low-energy impacts mainly induce surface damage to the nanowires, and only a few bulk defects were observed. Surface vacancies and adatoms accumulated to form defect clusters on the surface, and their distribution are related to the type of crystal plane, e.g. surface vacancies prefer to stay on (100) plane, while adatoms prefer (110) plane. These results reveal that the size effect will influence the interaction between low-energy ion and nanowire.

Key words: low-energy ion, irradiation, nanowire, molecular dynamics simulation

中图分类号: (Nanocrystalline materials)

61.82.Rx

61.80.Jh (Ion radiation effects) 61.82.Bg (Metals and alloys) 79.20.Rf (Atomic, molecular, and ion beam impact and interactions with surfaces) 68.35.Dv (Composition, segregation; defects and impurities) 61.80.Az (Theory and models of radiation effects)

邹雪晴, 薛建明, 王宇钢. Damage of low-energy ion irradiation on copper nanowire: molecular dynamics simulation[J]. 中国物理B, 2010, 19(3): 36102-036102.

Zou Xue-Qing(邹雪晴), Xue Jian-Ming(薛建明), and Wang Yu-Gang(王宇钢) . Damage of low-energy ion irradiation on copper nanowire: molecular dynamics simulation[J]. Chin. Phys. B, 2010, 19(3): 36102-036102.

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Damage of low-energy ion irradiation on copper nanowire: molecular dynamics simulation

Damage of low-energy ion irradiation on copper nanowire: molecular dynamics simulation

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