POSITRON ANNIHILATION IN CARBON NANOTUBE POWDERS

doi:10.1088/1004-423X/8/10/008

中国物理B ›› 1999, Vol. 8 ›› Issue (10): 783-786.doi: 10.1088/1004-423X/8/10/008

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇

POSITRON ANNIHILATION IN CARBON NANOTUBE POWDERS

马兴坤¹, 陈宏¹, 何元金¹, Y. Nagashima², H. Saito², T. Hyodo²

(1)Department of Physics, Tsinghua University, Beijing 100084, China; (2)Institute of Physics, College of Arts and Sciences, University of Tokyo, Komaba, Meguro, Tokyo 153, Japan

收稿日期:1999-04-13 出版日期:2005-08-06 发布日期:2005-08-06

POSITRON ANNIHILATION IN CARBON NANOTUBE POWDERS

Ma Xing-kun (马兴坤)^a, Chen Hong (陈宏)^a, He Yuan-jin (何元金)^a, Y. Nagashima^b, H. Saito^b, T. Hyodo^b

^a Department of Physics, Tsinghua University, Beijing 100084, China; ^b Institute of Physics, College of Arts and Sciences, University of Tokyo, Komaba, Meguro, Tokyo 153, Japan

Received:1999-04-13 Online:2005-08-06 Published:2005-08-06

摘要/Abstract

摘要： Positron lifetime spectra have been measured in two kinds of carbon nanotube powders as a function of temperature range between 32 and 296 K. It has been found that all spectra are essentially temperature-independent in the above temperature range. The results of analysis show that there are three components in the powders of carbon nanotube with an average diameter of 30 nm, and four components in the powders of carbon nanotube with typical diameters of around 15 nm. The average values of lifetime components obtained at various temperatures are about 220, 390 ps, and 2.0 ns for the former, and about 140, 300, 650 ps and 6.4 ns for the latter.

Abstract: Positron lifetime spectra have been measured in two kinds of carbon nanotube powders as a function of temperature range between 32 and 296 K. It has been found that all spectra are essentially temperature-independent in the above temperature range. The results of analysis show that there are three components in the powders of carbon nanotube with an average diameter of 30 nm, and four components in the powders of carbon nanotube with typical diameters of around 15 nm. The average values of lifetime components obtained at various temperatures are about 220, 390 ps, and 2.0 ns for the former, and about 140, 300, 650 ps and 6.4 ns for the latter.

中图分类号: (Positron annihilation)

78.70.Bj

61.46.Fg (Nanotubes) 61.46.Df (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))

马兴坤, 陈宏, 何元金, Y. Nagashima, H. Saito, T. Hyodo. POSITRON ANNIHILATION IN CARBON NANOTUBE POWDERS[J]. 中国物理B, 1999, 8(10): 783-786.

Ma Xing-kun (马兴坤), Chen Hong (陈宏), He Yuan-jin (何元金), Y. Nagashima, H. Saito, T. Hyodo. POSITRON ANNIHILATION IN CARBON NANOTUBE POWDERS[J]. Acta Physica Sinica (Overseas Edition), 1999, 8(10): 783-786.

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