Intra-grain conduction of self-doped polyaniline
Intra-grain conduction of self-doped polyaniline
复制标题
DOI：
10.1063/1.4961610
复制
发表时间：
2016-02
期刊：
影响因子：
--
通讯作者：
Y. Usami;K. Imamura;T. Akai;Dock-Chil Che;H. Ohoyama;H. Kobayashi;T. Matsumoto
中科院分区：
文献类型：
--
作者：
Y. Usami;K. Imamura;T. Akai;Dock-Chil Che;H. Ohoyama;H. Kobayashi;T. Matsumoto
在真空条件下，利用纳米间隙电极研究了自掺杂水溶性聚苯胺磺酸盐（SPAN）制备的聚苯胺薄膜（约10 nm厚）的导电行为。在10-300 K的温度范围内，甚至在高达105 V cm−1的高场区，电导也是欧姆的。电导的温度依赖性表明，SPAN给出了非常高的值的本地化长度（L）= 300 nm，没有二次掺杂，与传统的聚苯胺相比。我们建议，SPAN形成长距离的高度结晶的金属颗粒，我们观察到由于一些晶粒直接桥接两个纳米间隙电极在低温下的晶粒内导电。我们的结论是，晶粒间导电成为主导的温度升高。
The conduction behavior of ultrathin films (about 10 nm thick) composed of self-doped water-soluble polyaniline sulfonate (SPAN) was investigated using nano-gap electrodes under vacuum conditions. The conductance was found to be ohmic even in the high field regime up to 105 V cm−1 over a temperature range of 10–300 K. The temperature dependence of the conductance indicated that SPAN gave the extremely high value of localization length ( L) = 300 nm without secondary doping, in comparison with conventional polyaniline. We propose that SPAN forms long-range highly crystalline metallic grains, and we observed intra-grain conduction due to some grains directly bridging the two nano-gap electrodes at low temperature. We conclude that inter-grain conduction becomes dominant as the temperature increases.