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首页> 外文会议>Self-Assembly Processes in Materials >Surface and interfacial properties in thin poly(p-phenylene vinylene) multilayers prepared by self-assembly method
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Surface and interfacial properties in thin poly(p-phenylene vinylene) multilayers prepared by self-assembly method

机译：自组装法制备的聚对亚苯基亚乙烯基薄多层膜的表面和界面性能

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摘要

In this work we report on the influence of interfaces (metal/film, ITO/film) on the optical properties of ultrathin layers of poly(p-phenylene vinylene), PPV, adsorbed by self-assembly. PPV films were prepared exploiting the self-assembly method (SA) in addition to a low temperature conversion process for PPV. Using atomic force microscopy we show that 0.5 nm thick PPV layers can be homogeneously deposited on different metals (50% transmission Au, Cu, Pt, Ag, Cr films), glass and ITO surfaces. Absorption measurements reveal that the transitions involving π-π* conjugated states are blue shifted to different extents depending on the interface and on the film thickness. This indicates different extensions of interfacial disorder in the PPV layers. The ITO/PPV interface has the highest extension for disorder (～16 nm) and highest surface roughness (RMS～2.5 nm) while the lowest values (～5 nm and 0.6 nm, respectively) were found for the quartz/PPV interface. The metal interface induces significant luminescence quenching and spectral shifts, which depend on the type of metal used. The effect from incorporation of carbonyl and from chemical modifications of the ITO/organic interface during PPV thermal conversion is discussed.
机译：在这项工作中，我们报告了界面（金属/薄膜，ITO /薄膜）对自组装吸附的聚对苯撑亚乙烯基，PPV超薄层的光学性能的影响。除了用于PPV的低温转化工艺外，还利用自组装方法（SA）制备PPV膜。使用原子力显微镜，我们表明可以将0.5 nm厚的PPV层均匀沉积在不同的金属（50％透射率的Au，Cu，Pt，Ag，Cr膜），玻璃和ITO表面上。吸收测量表明，取决于界面和薄膜厚度，涉及π-π*共轭态的跃迁蓝移的程度不同。这表明PPV层中界面紊乱的不同扩展。 ITO / PPV界面的无序扩展最高（〜16 nm），表面粗糙度最高（RMS〜2.5 nm），而石英/ PPV界面的最低扩展值（分别为〜5 nm和0.6 nm）。金属界面会引起明显的发光淬灭和光谱偏移，这取决于所用金属的类型。讨论了在PPV热转化过程中，羰基的引入和ITO /有机界面的化学修饰的影响。

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