Positron Annihilation in Carbon Nanotubes

Wei Feng Guo; Xiang Lei Chen; Huai Jiang Du; Hui Min Weng; Bang Jiao Ye

doi:10.4028/www.scientific.net/MSF.607.198

Paper Titles

Positron Study of Carbon Black Parameters: Structure and Surface Area
p.186

Open-Nano Pores in Natural Minerals Studied by Positron Lifetime Spectroscopy
p.189

Study of the Defect Formation of Helium in Nanocrystalline Titanium Films
p.192

Tungsten Oxide Nanostructures Growth in HFCVD System by Slow Positron Beam
p.195

Positron Annihilation in Carbon Nanotubes
p.198

Formation of Ordered Pores Determined by Positronium Time of Flight Spectroscopy
p.201

Influence of Sintering Temperature on Defects in Porous Silica Monoliths Studied by Positron Annihilation Techniques
p.204

Porous Structure of Mesoporous Silica Studied by Positron Annihilation Lifetime Spectroscopy
p.207

Temperature Dependence of Free Volume in Epoxy/Rectorite Nanocomposites by Positron Annihilation
p.210

HomeMaterials Science ForumMaterials Science Forum Vol. 607Positron Annihilation in Carbon Nanotubes

Positron Annihilation in Carbon Nanotubes

Abstract:

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.