Nanostructured superhard carbon phase obtained under high pressure with shear deformation from single-wall nanotubes HiPco

被引:16
|
作者
Blank, V. D.
Denisov, V. N.
Kirichenko, A. N.
Lvova, N. A.
Martyushov, S. Y.
Mavrin, B. N. [1 ]
Popova, D. M.
Popov, M. Yu.
Tat'yanin, E. V.
Zakhidov, A. A.
机构
[1] Russian Acad Sci, Inst Spect, Troitsk, Moscow, Russia
[2] Technol Inst Superhard & Novel Carbon Mat Troitsk, Troitsk, Moscow, Russia
[3] Univ Texas, NanoTech Inst, Richardson, TX USA
[4] Univ Texas, Dept Phys, Richardson, TX USA
关键词
nanotube; high pressure; Raman; hardness;
D O I
10.1016/j.physb.2006.01.519
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Raman spectra of single-wall nanotubes under high pressure combined with shear deformation are investigated in situ in a diamond cell. Shear deformation applied under 3 5 GPa led to pressure multiplication up to 60 GPa, and increased the intensity of Raman bands more than ten times without essential change of G-mode position while causing its essential broadening. The G-mode remained broad after pressure unloading and shifted to 1534 cm(-1). The hardness of the superhard material was 58 +/- 6 GPa, comparable to the hardness of carbo-boro-nitride. A broad band appeared in the photoluminescence spectrum with a maximum at about 2 eV, which allowed to assume a high content of sp(3)-bonds in the sample. The large dispersion of the G-mode almost vanished after pressure unloading. However, a noticeable dispersion of the D-mode was found, which is a sign of certain ordering in the superhard phase. TEM study of the superhard phase detected clusters with graphene sheets with a size about 1 nm. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:58 / 64
页数:7
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