Positron Annihilation In Carbon Nanotubes

摘要：

Positron annihilation lifetime spectra have been measured in carbon nanotubes being pressed as a function of pressure up to 1536MPa. In addition, positron lifetime experiments for carbon nanotubes in vacuum, nitrogen and air have been performed respectively. Lifetimes have been obtained using LIFETIME program. The results display a single-component positron annihilation lifetime. Positron lifetime for carbon nanotubes decreases as the pressure increases, but lifetime is basically consistent after the pressure of 960MPa. Positron annihilation lifetime for carbon nanotubes in air is the shortest whereas the lifetime in vacuum the longest. We conclude that a positron annihilates with an electron on the external surface of carbon nanotubes.

关键词： positron annihilation carbon nanotubes

作者: Guo wei-feng Chen xiang-lei Du huai-jiang Weng hui-min Ye bang-jiao

作者单位: Laboratory of Nuclear Solid State Physics,University of Science and Technology of China,Hefei 230026 Laboratory of Nuclear Solid State Physics,University of Science and Technology of China,Hefei 230026

会议类型: 国际会议

会议名称: 第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)

会议地点: 武汉

会议语种:英文

页码: 198-200

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）