Abstract:

A new kind of bonded organic/inorganic composite second-order nonlinear optical(NLO) material containing 4-(4′-nitrophenyl-diazenyl)phenyl-1,3-diamine azobenzene (DAB) was synthesized through the sol-gel process by using 3-glycidoxy -propyltrimethoxysilane (KH-560) as coupler agent.The CdS nanoparticles surface-capped with AOT-SO^-₃［(bis- 2- ethylhexyl)sulfosuccinate］ was doped into the above nanocomposites NLO material.After corona polarization at 160℃ and 6000V for 1 h, with CdS content increasing, the polarized film order parameter increased from 0.278 to 0.375 and second-order NLO coefficient increased from 7.784× 10^-9esu to 7.556×10^-7esu.After corona polarization of the film at 150℃ and 7000 V for 1 h, the second-order NLO coefficient could reach 8.638×10^-7esu according to one dimensional rigid oriented gas model (1DROGM).The three-dimensional networks could restrict the dipole alignment relaxation of NLO chromophores.The results showed that this bonded polymer film had a high NLO capability at room temperature.The order parameter could maintain about 95% of its initial value at 100℃ for 400 h.

Key words:

溶胶-凝胶, 二阶非线性光学, 偶氮苯生色团, 有机-无机复合, 甲基丙烯酸甲酯, 二氧化硅, 硫化镉

摘要：

以γ-缩水甘油醚基丙基三甲氧基硅烷(KH-560)为偶联剂，用溶胶-凝胶法合成了含4-(4′-对硝基偶氮苯)-3-氨基-苯胺(DAB)生色团的键合型有机/无机复合非线性光学材料。以掺杂的方式引入表面用AOT修饰的纳米CdS微粒。在160℃、6000 V条件下经电晕电场极化后，只含DABASD的聚合物膜极化后序参数Ф值为0.278，二阶非线性光学系数(d₃₃)值为7.784×10^-9esu，含CdS/DABASD的聚合物膜极化后序参数Ф值为0.375，d₃₃值为7.556×10^-7esu。在150℃、7000 V条件下经电晕电场极化1h后d₃₃可达8.638×10^-7esu。这种有机生色团与无机玻璃键合形成的交联网络结构中，无机玻璃的刚性三维结构能有效抑制NLO生色团的极化松弛。去极化实验结果表明，复合材料的非线性光学性能的常温稳定性好，在100℃放置400 h序参数仍保持初值的95％以上。

关键词:

溶胶-凝胶, 二阶非线性光学, 偶氮苯生色团, 有机-无机复合, 甲基丙烯酸甲酯, 二氧化硅, 硫化镉