Double-walled carbon nanotubes under hydrostatic pressure: Raman experiments and simulations

被引:11
作者
Gadagkar, Vikram
Saha, Surajit [1 ]
Muthu, D. V. S.
Maiti, Prabal K.
Lansac, Yves
Jagota, A.
Moravsky, Alexander
Loutfy, R. O.
Sood, A. K.
机构
[1] Indian Inst Sci, Dept Phys, Ctr Condensed Matter Theory, Bangalore 560012, Karnataka, India
[2] Univ Tours, CEA, CNRS, UMR 6157,LEMA, F-37200 Tours, France
[3] Lehigh Univ, Dept Chem Engn, Bethlehem, PA 18015 USA
[4] Mat & Electrochem Res Corp, Tucson, AZ USA
关键词
DWNT; high pressure; Raman spectroscopy; molecular dynamics;
D O I
10.1166/jnn.2007.710
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We have used Raman spectroscopy to study the behavior of double-walled carbon nanotubes (DWNT) under hydrostatic pressure. We find that the rate of change of the tangential mode frequency with pressure is higher for the sample with traces of polymer compared to the pristine sample. We have performed classical molecular dynamics simulations to study the collapse of single (SWNT) and double-walled carbon nanotube bundles under hydrostatic pressure. The collapse pressure (p(c)) was found to vary as 1/R-3, where R is the SWNT radius or the DWNT effective radius. The bundles showed similar to 30% hysteresis and the hexagonally close packed lattice was completely restored on decompression. The p, of a DWNT bundle was found to be close to the sum of its values for the inner and the outer tubes considered separately as SWNT bundles, demonstrating that the inner tube supports the outer tube and that the effective bending stiffness of DWNT, D-DWNT similar to 2D(SWNT).
引用
收藏
页码:1753 / 1759
页数:7
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