Enhanced Optical Properties of Layer-by-Layer Films of Poly(p-phenylenevinylene) Alternated with a Long Chain Counterion and Converted at Low Temperatures
Enhanced Optical Properties of Layer-by-Layer Films of Poly(p-phenylenevinylene) Alternated with a Long Chain Counterion and Converted at Low Temperatures
复制标题
长链抗衡离子交替并在低温下转化的聚对亚苯基亚乙烯基层状薄膜的增强光学性能
DOI：
10.1021/ma020434
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发表时间：
2002
期刊：
影响因子：
5.5
通讯作者：
F. Guimarães
中科院分区：
文献类型：
--
作者：
A. Marletta;F. Castro;C. A. M. Borges;O. N. Oliveira;A. Faria;F. Guimarães
采用长链十二烷基苯磺酸根阴离子（DBS）对聚对亚苯基亚乙烯基（PPV）前体进行了逐层（LBL）薄膜制备。我们采用了替代方法，通过DBS控制取代水溶性PPV前体的氯离子。这些膜的内层结构可能不同于常规LBL膜，因为DBS被并入PPV前体链中。除了磺酸盐的快速吸附之外，引入DBS允许膜在110 °C下在12分钟内以高共轭长度转化。通过改变溶液中DBS的量，可以控制PPV片段的缀合长度。发光和吸收光谱显示出强烈的电子振动结构，比PPV的浇铸膜和朗缪尔-布洛杰特膜更好地分辨。低温下转化的LBL薄膜由于没有高温转化产生的羰基而具有较高的量子效率。
Layer-by-layer (LBL) thin films of a poly(p-phenylenevinylene) (PPV) precursor have been processed using the long chain dodecylbenzenesulfonate anion (DBS). We adopted the alternative approach with controlled substitution of the chloride counterion of the water-soluble PPV precursor by DBS. The internal layer structure of these films is likely to be different from conventional LBL films, since DBS is incorporated into the PPV precursor chain. In addition to the fast adsorption of the sulfonic salt, introducing DBS allows the films to be converted at 110 °C within 12 min with a high conjugation length. By varying the amount of DBS in the solution, the conjugation length of the PPV segments can be controlled. The luminescence and absorption spectra show intense vibronic structures that are better resolved than for cast and Langmuir−Blodgett films of PPV. LBL films converted at lower temperatures display higher quantum efficiency, owing to the absence of carbonyl groups arising from high-temperature conversi...