Electronic transport properties of spin-crossover polymer plus polyaniline composites with Fe3O4 nanoparticles

Esha Mishra, Wai Kiat Chin, K. McElveen, T. K. Ekanayaka, Moahmmad Zaz, Gauthami Viswan, Ruthi Zielinski, A. N’Diaye, David Shapiro, Rebecca Y Lai, R. Streubel, P. A. Dowben
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Abstract

Adding Fe3O4 nanoparticles to composites of [Fe(Htrz)2(trz)](BF4) spin-crossover polymer and polyaniline drives a phase separation of both and restores the molecular structure and cooperative effects of the spin-crossover polymer without compromising the increased conductivity gained through the addition of polyaniline. We observe an increased on-off ratio for the DC conductivity owing to an enlarged off state resistivity and a 20 times larger AC conductivity of the on state compared with DC values. The Fe3O4 nanoparticles, primarily confined to the [Fe(Htrz)2 (trz)](BF4 ) phase, are ferromagnetically coupled to the local moment of the spin-crossover molecule suggesting the existence of an exchange interaction between the both components.
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带有 Fe3O4 纳米粒子的自旋交叉聚合物加聚苯胺复合材料的电子传输特性
在[Fe(Htrz)2(trz)](BF4)自旋交叉聚合物和聚苯胺的复合材料中加入 Fe3O4 纳米粒子,可促使两者相分离,并恢复自旋交叉聚合物的分子结构和协同效应,而不会影响因加入聚苯胺而增加的导电性。我们观察到,由于离态电阻率增大,直流导电率的通断比增大,而与直流值相比,通态交流导电率增大了 20 倍。主要局限于[Fe(Htrz)2 (trz)](BF4)相的 Fe3O4 纳米粒子与自旋交叉分子的局部力矩具有铁磁耦合,这表明这两种成分之间存在交换相互作用。
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