Synthesis and characterization of polydiacetylene films and nanotubes.
Synthesis and characterization of polydiacetylene films and nanotubes.
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DOI：
10.1021/la801948z
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发表时间：
2008-10-21
期刊：
影响因子：
--
通讯作者：
Kohli P
中科院分区：
文献类型：
--
作者：
Gatebe E;Herron H;Zakeri R;Ramiah Rajasekaran P;Aouadi S;Kohli P
我们在这里报告的聚丁二炔（PDA）薄膜和纳米管的合成和表征使用逐层（LBL）化学。10，12-二十二碳二炔二酸（DCDA）单体在纳米多孔氧化铝模板表面和内部自组装。DCDA的UV照射提供聚合的DCDA（PDCDA）膜和纳米管。我们已经使用锆-羧酸盐层间化学在平坦表面和纳米多孔模板中合成PDCDA多层膜。PDCDA多层膜的特征在于使用光学（紫外-可见，荧光，椭圆偏振，FTIR）光谱，离子电流-电压（I-V）分析，和扫描电子显微镜。椭偏仪，FTIR，电子吸收和发射光谱表明，在每个沉积周期均匀的DCDA沉积。我们的光学光谱分析表明，羧酸锆交联化学是强大的。为了解释在PDCDA多层膜的烷基部分的解体，我们建议羧酸锆互连作为“锁”之间的PDCDA层，限制在膜中的烷基部分的移动。由于这种锁定，聚合物链中的诱导应力不能被有效地释放。我们的I-V分析的离子电阻数据与计算的电阻在较小的PDCDA层的数量，但显着偏离较厚的PDCDA纳米管。这些差异归因于离子阻挡，因为一些PDCDA纳米管是完全封闭的，以及当孔的直径接近纳米管内部溶液的双层厚度时的非欧姆和选择性渗透的离子行为。
We report here the synthesis and characterization of polydiacetylene (PDA) films and nanotubes using layer-by-layer (LBL) chemistry. 10,12-Docosadiyndioic acid (DCDA) monomer was self-assembled on flat surfaces and inside of nanoporous alumina templates. UV irradiation of DCDA provided polymerized-DCDA (PDCDA) films and nanotubes. We have used zirconium-carboxylate interlayer chemistry to synthesize PDCDA multilayers on flat surfaces and in nanoporous template. PDCDA multilayers were characterized using optical (UV–vis, fluorescence, ellipsometry, FTIR) spectroscopies, ionic current–voltage (I–V) analysis, and scanning electron microscopy. Ellipsometry, FTIR, electronic absorption and emission spectroscopies showed a uniform DCDA deposition at each deposition cycle. Our optical spectroscopic analysis indicates that carboxylate-zirconium interlinking chemistry is robust. To explain the disorganization in the alkyl portion of PDCDA multilayer films, we propose carboxylate-zirconium interlinkages act as “locks” in between PDCDA layers which restrict the movement of alkyl portion in the films. Because of this locking, the induced-stresses in the polymer chains can not be efficiently relieved. Our ionic resistance data from I–V analysis correlate well with calculated resistance at smaller number of PDCDA layers but significantly deviated for thicker PDCDA nanotubes. These differences were attributed to ion-blocking because some of the PDCDA nanotubes were totally closed and the nonohmic and permselective ionic behaviors when the diameter of the pores approaches the double-layer thickness of the solution inside of the nanotubes.
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影响因子：
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作者：
LEE, H;KEPLEY, LJ;MALLOUK, TE
通讯作者：
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