Cano Laida, Di Mauro Angela Evelyn, Striccoli Marinella, Curri M Lucia, Tercjak Agnieszka
Group Materials and Technologies, Chemical Engineering and Environmental Department, Polytechnic School, University of the Basque Country (UPV/EHU) , Plaza Europa 1, 20018 Donostia-San Sebastián, Spain.
ACS Appl Mater Interfaces. 2014 Jul 23;6(14):11805-14. doi: 10.1021/am502542k. Epub 2014 Jul 9.
As-synthesized organic-capped TiO2 nanorods were incorporated into polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer to achieve TiO2/PS-b-PMMA nanocomposites with enhanced optical and conductive properties. The specific surface chemistry of TiO2 nanorods derived from the colloidal synthetic approach allowed their prompt incorporation in the PS-b-PMMA block copolymer template up to 50 wt %, which resulted in films with an extended coverage of highly dispersed nanoparticles for contents higher than 30 wt %. At such high nanorod contents, the films fabricated by the prepared nanocomposites demonstrated enhanced optical properties. Atomic force microscopy investigation of the nanocomposite films showed a cylindrical morphology for low nanorod contents. Conversely, higher nanorod contents resulted upon removal of the organic component in the nanocomposites with UV treatment in overall nanorod coverage of the film surface with the concomitant formation of charge percolation paths, which led to noticeable conductivity values. EFM and PF-TUNA measurements confirmed the conductive properties of the composites at nanoscale, whereas semiconductor analyzer measurements provided their macroscale characterization. In addition, an increase in the UV-vis absorption was observed with the increase in the nanorod content along with a remarkable conductivity of the overall film.
将合成的有机包覆二氧化钛纳米棒掺入聚苯乙烯-嵌段-聚（甲基丙烯酸甲酯）（PS-b-PMMA）二嵌段共聚物中，以制备具有增强光学和导电性能的TiO2/PS-b-PMMA纳米复合材料。通过胶体合成方法得到的TiO2纳米棒的特定表面化学性质使其能够迅速掺入PS-b-PMMA嵌段共聚物模板中，掺入量可达50 wt%，当含量高于30 wt%时，会形成具有高度分散纳米颗粒扩展覆盖的薄膜。在如此高的纳米棒含量下，由制备的纳米复合材料制成的薄膜表现出增强的光学性能。对纳米复合薄膜的原子力显微镜研究表明，低纳米棒含量时呈现圆柱形态。相反，通过紫外线处理去除纳米复合材料中的有机成分后，纳米棒含量较高，薄膜表面的纳米棒整体覆盖率增加，同时形成电荷渗流路径，导致显著的电导率值。EFM和PF-TUNA测量证实了复合材料在纳米尺度上的导电性能，而半导体分析仪测量则提供了它们的宏观表征。此外，随着纳米棒含量的增加，观察到紫外可见吸收增加，同时整个薄膜具有显著的导电性。
