Positron annihilation characteristics in multi-wall carbon nanotubes with different average diameters

16th International Conference on Positron Annihilation

Tuyen, L.A.^1 ; Kajcsos, Zs^2 ; Lázár, K.^3 ; Tap, T.D.^4 ; Khiem, D.D.^1 ; Phuc, P.T.^1

Center for Nuclear Techniques, Vietnam Atomic Energy Institute, 217 Nguyentrai Street, District 1, Hochiminh City, Viet Nam^1

Institute for Particle and Nuclear Physics, Wigner Research Center for Physics, Hungarian Academy of Sciences, P.O.B. 49, H-1525 Budapest 114, Hungary, Hungary^2

Centre for Energy Research, Institute of Isotopes, Hungarian Academy of Sciences, P.O.B 49, H-1525, Budapest 114, Hungary^3

Department of Nuclear Physics, University of Natural Science, 227 Nguyenvancu Street, District 5, Hochiminh City, Viet Nam^4

关键词: Average diameter;    Diffusion model;    Escape rate;    External surfaces;    Nanotube diameters;    Nanotube surface;    Positron lifetime;    Positron lifetime spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012065/pdf
DOI  :  10.1088/1742-6596/443/1/012065

来源: IOP

【 摘 要 】

Positron lifetime spectroscopy was used to study multi-wall carbon nanotubes. The measurements were performed in vacuum on the samples having different average diameters. The positron lifetime values depend on the nanotube diameter. The results also show an influence of the nanotube diameter on the positron annihilation intensity on the nanotube surface. The change in the annihilation probability is described and interpreted by the modified diffusion model introducing the positron escape rate from the nanotubes to their external surface.