Novel nanotubes and encapsulated nanowires

被引:153
作者
Terrones, M [1 ]
Hsu, WK
Schilder, A
Terrones, H
Grobert, N
Hare, JP
Zhu, YQ
Schwoerer, M
Prassides, K
Kroto, HW
Walton, DRM
机构
[1] Univ Sussex, Sch Chem Phys & Environm Sci, Brighton BN1 9QJ, E Sussex, England
[2] Univ Bayreuth, Lehrstuhl Expt Phys 2, Bayreuth, Germany
[3] Bayreuther Inst Makromol Forsch, D-95440 Bayreuth, Germany
[4] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico
来源
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 1998年 / 66卷 / 03期
关键词
D O I
10.1007/s003390050671
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Carbon nanotubes, with or without encapsulated material, generated by are discharge and electrolytic techniques have been studied. Microcrystals of refractory carbides (i.e. NbC, TaC, MoC), contained in nanotubes and polyhedral particles, produced by arcing electrodes of graphite/metal mixtures, were analysed by high hesolution transmission electron microscopy (HRTEM) and X-ray powder diffraction. Encapsulation of MoC was found to give rise to an unusual stable form, namely face-centered-cubic MoC. SQUID measurements indicate that the encapsulated carbides exhibit superconducting transitions at about 10-12 K, thus they differ from carbon nanotubes/nanoparticles which do not superconduct. Four-probe and microwave (contactless) conductivity measurements indicate that most of the analysed samples behave as semiconductors. However, metallic transport was observed in specimens containing single conglomerated carbon nanotube bundles and boron-doped carbon nanotubes. Novel metallic beta-Sn nanowires were produced by electrolysis of graphite electrodes immersed in molten LiCl/SnCl2 mixtures. Prolonged electron irradiation of these nanowires leads to axial growth and to dynamic transformations. These observations suggest ways in which materials may be modified by microencapsulation and irradiation.
引用
收藏
页码:307 / 317
页数:11
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