聚(2-甲氧基-5-乙氧基苯)撑纳米阵列的形态和光学特性

Morphologies and Optical Properties of Poly(2-methoxy-5-ethoxy-p-phenylene) Nanofibril Arrays

在阳极氧化铝 (AAO)模板的纳米孔内通过 1 甲氧基 4 乙氧基苯 (MEB)的氧化偶合聚合组装聚 (2 甲氧基 5 乙氧基苯 )撑 (MEO PPP)纳米纤维阵列 .通过对纳米线的分子结构 ,AAO模板和聚 (2 甲氧基 5 乙氧基苯 )撑纳米纤维阵列的形态和形貌表征表明 ,AAO模板的纳米孔均匀有序且相互平行 ,定向生长的聚 (2 甲氧基 5 乙氧基苯 )撑纳米纤维的分子链与AAO纳米孔的轴线平行 ,聚合物分子链的定向排列能够显著提高电导率 ,MEO PPP分子链的聚对苯撑 (PPP)骨架有良好的π π 共轭体系 ,引起吸收带向长波方向移动 .MEO PPP纳米纤维阵列比其无序纳米纤维有 5nm的发射蓝移 .

Anodic aluminum oxide (AAO) membrane can be used as template for the synthesis of nanostructures. In this paper, we have fabricated poly(2-methoxy-5-ethoxy-p-phenylene) (MEO-PPP) nanofibril arrays by oxidative coupling polymerization of 1-methoxy-4-ethoxybenzene (MEB) within the pores of AAO template. The detailed molecular structure of the polymer nanofibrils, the morphologies and images of the AAO template and the fabricated nanometer scale of poly(2-methoxy-5-ethoxy-p-phenylene) nanofibril arrays were characterized. The experimental results demonstrate that the pores of the AAO membrane are regular and uniform, and parallel to each other. Furthermore, the MEO-PPP chains in the narrowest template-synthesized fibrils are oriented in parallel to pore axes of AAO membrane, and perpendicularly to the surface of aluminum substrate. The polymer chain orientation is partially responsible for the enhanced conductivity. Ultraviolet absorption maximum shows that the polymer contains a better extended π-conjugation system along poly(p-phenylene) backbone, which results in longer wavelength shift of the absorption band. Photoluminescence (PL) spectrum of nanofibril arrays exhibits that there is 5 nm blue shift of emission in comparison with the unordered molecules.