中文摘要：

采用原位聚合的方法合成了聚（（3-己基噻吩）-2,5-二（4-羟基-3-甲氧基苯甲烯））包覆的多壁碳纳米管（PHTHMOBQ/MWNTs）.荧光光谱分析表明,PHTHMOBQ/MWNTs复合体中,碳纳米管与共轭聚合物PHTHMOBQ之间形成光致电子转移体系,使得π电子离域程度增加,并且导致荧光量子效率降低.根据Eg与入射光子能量hv的关系,拟合了PHTHMOBQ/MWNTs薄膜的光学禁带宽度.发现随着碳纳米管含量的增加,Eg逐步减小.采用简并四波混频的方法（532nm,8ns）测量PHTHMOBQ/MWNTs的三阶非线性极化率x（3）以及二阶分子超极化率γ.为了避免形成热效应光栅,从而抑制热效应的贡献,控制两束抽运光为垂直偏振方向而探测光为水平偏振方向.随着碳纳米管含量的增加,PHTHMOBQ/MWNTs的非线性光学响应逐渐增强.这归功于共轭聚合物PHTHMOBQ与MWNTs之间形成了分子间光致电子转移体系.

英文摘要：

Carbon nanotubes coated with an nonlinear optical （NLO） polymer, poly [ 3-hexylthiophene-2, 5-diyl ]-[ 3-methoxyl-4- hydroxyl-benzylidenequino-methane] （PHTHMOBQ/MWNTs）, were synthesizedvia in-situ polymerization. The micrograph of PHTHMOBQ/MWNTs has the coaxial tubular structure, which indicated that the polymer was restricted and wrapped on the surface of carbon nanotubes while propagating during polymerization. PHTHMOBQ /MWNTs showed fluorescence quenching, which involved the inter-molecular photo-induced charge transfer process. Third-order nonlinear susceptibility x^（3） and secondorder hyperpolarizability γ of PHTHMOBQ/MWNTs were measured using degenerate four wave mixing at 532nm under nanosecond pulse excitation. The two pump beams were vertically polarized and the probe beam was horizontally polarized to avoid thermal effect. The third-order NIX） responses were enhanced gradually when nanotube content increased, which was attributed to inter-molecular photo-induced electron transfer between PHTHMOBQ and MWNTs.