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arXiv 0901.2028cond-mat.mtrl-sci
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外加磁场对聚苯胺复合膜形成的影响

Effect of the applied magnetic field on formation of complex polyaniline films

Oleg P. Dimitriev, Petro M. Lytvyn, Alla P. Dimitriyeva, Ostap M. Getsko

摘要:

研究了在外加磁场作用下,反磁性TCNQ和顺磁性金属离子杂质复合聚苯胺(PANI)薄膜的形成。已经发现,所施加的磁场影响PANI链与杂质的相互作用,并诱导在由顺磁性金属离子掺杂的复合膜中形成磁有序区域,这与在环境条件下制备的具有相同组成的参考膜形成对比。利用扫描磁力显微镜直接观察到了磁有序区。结果发现,在分布的磁有序区域和特殊性的表面浮雕的薄膜。电子吸收光谱和电导率的测量表明,施加恒定的磁场可以抑制聚苯胺链和顺磁性金属离子的相互作用,并降低所得的复合膜的电导率高达一个数量级相比,参考膜。发现交变磁场可改善PANI与抗磁性TCNQ分子的相互作用。讨论了磁场对复合膜形成的影响机理。

英文摘要:

Formation of complex polyaniline (PANI) films with diamagnetic TCNQ and paramagnetic metal ion impurities cast under applied magnetic field was studied. It has been found that the applied magnetic field affects interaction of PANI chains with the impurities and induces formation of magnetically ordered regions in the complex film doped by paramagnetic metal ions in contrast to the reference film of the same composition but prepared under ambient conditions. The magnetically ordered regions have been observed directly by scanning magnetic force microscopy. It was found a correlation in distribution of the magnetically ordered regions and peculiarities of the surface relief of a film. Electronic absorption spectra and conductivity measurements showed that an applied stationary magnetic field can suppress the interaction of PANI chains and paramagnetic metal ions and lowers conductivity of the resulting complex film up to one order of magnitude as compared with the reference film. An alternating magnetic field was found to improve interaction of PANI and diamagnetic TCNQ molecules. The mechanisms of the magnetic field influence on the complex film formation are discussed.

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