中国物理B ›› 2015, Vol. 24 ›› Issue (11): 116103-116103.doi: 10.1088/1674-1056/24/11/116103

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Electron irradiation-induced change of structure and damage mechanisms in multi-walled carbon nanotubes

杨剑群a, 李兴冀a, 刘超铭a, 马国亮a, 高峰b   

  1. a School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
    b National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2015-03-28 修回日期:2015-07-20 出版日期:2015-11-05 发布日期:2015-11-05
  • 通讯作者: Li Xing-Ji E-mail:lxj0218@hit.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51503053).

Electron irradiation-induced change of structure and damage mechanisms in multi-walled carbon nanotubes

Yang Jian-Qun (杨剑群)a, Li Xing-Ji (李兴冀)a, Liu Chao-Ming (刘超铭)a, Ma Guo-Liang (马国亮)a, Gao Feng (高峰)b   

  1. a School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
    b National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2015-03-28 Revised:2015-07-20 Online:2015-11-05 Published:2015-11-05
  • Contact: Li Xing-Ji E-mail:lxj0218@hit.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51503053).

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摘要： Owing to their unique structure and excellent electrical property, carbon nanotubes (CNTs) as an ideal candidate for making future electronic components have great application potentiality. In order to meet the requirements for space application in electronic components, it is necessary to study structural changes and damage mechanisms of multi-walled carbon nanotubes (MWCNTs), caused by the irradiations of 70 and 110 keV electrons. In the paper, the changes of structure and damage mechanisms in the irradiated MWCNTs, induced by the irradiations of 70 and 110 keV electrons, are investigated. The changes in surface morphology and structure of the irradiated MWCNT film are characterized using scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS), Raman spectroscopy, x-ray diffraction analysis (XRD), and electron paramagnetic resonance (EPR) spectroscopy. It is found that the MWCNTs show different behaviors in structural changes after 70 and 110 keV electron irradiation due to different damage mechanisms. SEM results reveal that the irradiation of 70 keV electrons does not change surface morphology of the MWCNT film, while the irradiation of 110 keV electrons with a high fluence of 5×1015 cm-2 leads to evident morphological changes, such as the formation of a rough surface, the entanglement of nanotubes and the shrinkage of nanotubes. Based on Raman spectroscopy, XPS, and XRD analyses, it is confirmed that the irradiation of 70 keV electrons increases the interlayer spacing of the MWCNTs and disorders their structure through electronic excitations and ionization effects, while the irradiation of 110 keV electrons obviously reduces the interlayer spacing of the MWCNTs and improves their graphitic order through knock-on atom displacements. The improvement of the irradiated MWCNTs by 110 keV electrons is attributed to the restructuring of defect sites induced by knock-on atom displacements. EPR spectroscopic analyses reveal that the MWCNTs exposed to both 70 keV electrons and 110 keV electrons suffer ionization damage to some extent.

关键词: electron irradiation, multi-walled carbon nanotubes, damage mechanisms, Raman spectroscopy

Abstract: Owing to their unique structure and excellent electrical property, carbon nanotubes (CNTs) as an ideal candidate for making future electronic components have great application potentiality. In order to meet the requirements for space application in electronic components, it is necessary to study structural changes and damage mechanisms of multi-walled carbon nanotubes (MWCNTs), caused by the irradiations of 70 and 110 keV electrons. In the paper, the changes of structure and damage mechanisms in the irradiated MWCNTs, induced by the irradiations of 70 and 110 keV electrons, are investigated. The changes in surface morphology and structure of the irradiated MWCNT film are characterized using scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS), Raman spectroscopy, x-ray diffraction analysis (XRD), and electron paramagnetic resonance (EPR) spectroscopy. It is found that the MWCNTs show different behaviors in structural changes after 70 and 110 keV electron irradiation due to different damage mechanisms. SEM results reveal that the irradiation of 70 keV electrons does not change surface morphology of the MWCNT film, while the irradiation of 110 keV electrons with a high fluence of 5×1015 cm-2 leads to evident morphological changes, such as the formation of a rough surface, the entanglement of nanotubes and the shrinkage of nanotubes. Based on Raman spectroscopy, XPS, and XRD analyses, it is confirmed that the irradiation of 70 keV electrons increases the interlayer spacing of the MWCNTs and disorders their structure through electronic excitations and ionization effects, while the irradiation of 110 keV electrons obviously reduces the interlayer spacing of the MWCNTs and improves their graphitic order through knock-on atom displacements. The improvement of the irradiated MWCNTs by 110 keV electrons is attributed to the restructuring of defect sites induced by knock-on atom displacements. EPR spectroscopic analyses reveal that the MWCNTs exposed to both 70 keV electrons and 110 keV electrons suffer ionization damage to some extent.

Key words: electron irradiation, multi-walled carbon nanotubes, damage mechanisms, Raman spectroscopy

中图分类号:  (Nanotubes)

  • 61.46.Fg
73.63.Fg (Nanotubes)