π-π interaction enhancement on the ultrafast third-order optical nonlinearity of carbon nanotubes/polymer composites

被引：31
|
作者：
Wang, ZW
Liu, CL
Liu, ZG
Xiang, H
Li, Z
Gong, QH [1 ]
机构：
[1] Peking Univ, Dept Phys, Beijing 100871, Peoples R China
[2] Peking Univ, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
来源：
CHEMICAL PHYSICS LETTERS | 2005年 / 407卷 / 1-3期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1016/j.cplett.2005.03.038
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Multi-walled carbon nanotubes (MWNTs) have been noncovalently modified with poly [2-methoxy, 5-(2'-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) and poly [vinyl pyrrolidone] (PVP) to form two soluble MWNTs/polymer supramolecular composites. For the composite MWNTs/MEH-PPV, there is pi-pi interaction between the MEH-PPV and MWNTs besides wrapping of the polymer. The ultrafast third-order optical nonlinearities of the two composites were measured by using femtosecond time-resolved optical Kerr technique at the wavelength of 820 nm. MWNTs/MEH-PPV exhibits much larger ultrafast third-order optical nonlinearity than MWNTs/PVP. This enhancement is ascribed to the strong intermolecular nonlinearity induced by the pi-pi interaction between the polymer MEH-PPV and the sidewall of carbon nanotubes. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：35 / 39
页数：5
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