水和乙醇对纳米管结构聚苯胺电阻率的影响

研究了水和无水乙醇对萘磺酸掺杂的纳米管结构聚苯胺的电阻率-温度依赖关系的影响（测量温区为80—300K）.实验结果表明，水分子和乙醇分子的进入均使样品的电导率升高.利用电荷能量限制隧道模型结合纳米管粉末压片的结构特点，认为样品电阻主要来源于纳米管间接触电阻.水或乙醇分子在纳米管聚苯胺中通过与分子链的相互作用，增加了链间与链上非局域化载流子的数量，增大管间接触界面，降低了载流子的隧穿势垒，进而提高了导电能力.但水和乙醇对样品导电性质影响程度是不同的，主要是因为水分子和乙醇分子在结构和物理化学性质上的不同. 关键词： 聚苯胺 纳米管 电阻率

Resistivity of polyaniline nanotubes doped with naphthalene sulfonic acid: dependence on moisture and ethanol

The moisture and ethanol dependences of electrical properties of polyaniline (PANI) nanotubes doped with naphthalene sulfonic acid (NSA) are reported. The experiments were carried out in a temperature range from 80 to 300K. On the basis of analyzing the characteristics of the samples, we suggest that the resistance of the samples is dominated by the contact resistance between the PANI nanotubes, and the observed lnR(T)∝T-1/2 relation is explained in terms of the charge-energy-limited tunneling (CELT) model. The presence of water or ethanol molecules increases the conductivity, which is ascribed to the enhancement of charge carrier transfer and contact interface between the nanotubes upon exposure to water and ethanol. However, the extent of change during exposure to water and ethanol can be attributed to the differences in their chemical structures as well as their physicochemical properties.