Pressure-induced phenomena in single-walled carbon nanotubes: Structural phase transitions and the role of pressure transmitting medium

被引：13
|
作者：
Kuntscher, C. A. [1 ]
Abouelsayed, A. [1 ]
Thirunavukkuarasu, K. [1 ]
Hennrich, F. [2 ]
机构：
[1] Univ Augsburg, D-86159 Augsburg, Germany
[2] KIT, Inst Nanotechnol, D-76021 Karlsruhe, Germany
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2010年 / 247卷 / 11-12期
关键词：
high pressure; infrared spectroscopy; single-walled carbon nanotubes; structural phase transition; ELECTRONIC-PROPERTIES;
D O I：
10.1002/pssb.201000150
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We studied the effect of pressure on the electronic properties of bundled single-walled carbon nanotubes by infrared transmission measurements. Different pressure transmitting media were employed to verify their influence on the observed pressure dependence. A redshift of the optical absorption bands is observed under pressure. Irrespective of the pressure transmitting medium, the pressure-induced frequency shifts of the optical transitions show an anomaly at a critical pressure P-c=2-3 GPa, which can be attributed to the predicted circular-to-elliptical structural phase transition. We find a second anomaly in the frequency shifts of the optical transitions at 5 6 GPa which we interpret in terms of the change of the nanotubes cross-section from to race-track or peanut type, in agreement with earlier reports. (c) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码：2789 / 2792
页数：4
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