Photoluminescence study of aqueous-surfactant-wrapped single-walled carbon nanotubes under hydrostatic pressure

被引：20
|
作者：
Deacon, R. S. [1 ]
Chuang, K. -C. [1 ]
Doig, J. [1 ]
Mortimer, I. B. [1 ]
Nicholas, R. J. [1 ]
机构：
[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
来源：
PHYSICAL REVIEW B | 2006年 / 74卷 / 20期
关键词：
D O I：
10.1103/PhysRevB.74.201402
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present an experimental study of sodium-dodecylbenzene-sulfate-wrapped single-walled carbon nanotube (SWCNT) suspensions in D2O under hydrostatic pressure. Photoluminescence excitation mapping allows identification of the first and second Van Hove optical transitions (E-11 and E-22) in a pressure range of P=0-9.1 kbar using a liquid clamp pressure cell. Shifts were observed in both E-11 and E-22 that allow the identification of two independent pressure effects. The first results from a uniaxial strain component with positive and negative energy shifts for structural factors [q=mod(n-m,3)] q=2 and 1 in agreement with theoretical band structure predictions. The second results from environmental effects that produce for all SWCNT's a downshift in energy caused by significant changes in the Coulomb interactions for a higher-dielectric medium.
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页数：4
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