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Impedance spectroscopy of thin films of emeraldine base polyaniline and its implications for chemical sensing

机译：翡翠碱聚苯胺薄膜的阻抗谱及其对化学传感的影响

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摘要

The conductivity of an emeraldine base polyaniline thin film on an interdigitated electrode in hydrochloric acid solutions of various pHs between 2.25 and 6 was investigated by impedance spectroscopy. In general, protonation induces an emeraldine base (EB) to emeraldine salt (ES) transformation and an associated increase in conductivity only when the pH of the protonating bath is less than 4. However, impedance spectroscopy detects changes in the conductivity behavior that occur prior to the onset of this increase in total conductivity change. These changes can also be measured with AC impedance measurements at a single frequency, which expands the pH range over which emeraldine base polyaniline can be used as a sensor.
机译：通过阻抗谱研究了指状电极上的翡翠碱型聚苯胺薄膜在2.25至6之间的各种pH的盐酸溶液中的电导率。通常，仅当质子化浴的pH值小于4时，质子化才会诱导绿宝石碱（EB）转变为绿宝石盐（ES），并相应地提高电导率。但是，阻抗谱检测到电导率行为在以前发生的变化。总电导率变化开始增加。这些变化也可以通过在单个频率上进行AC阻抗测量来测量，这扩展了pH范围，在该pH范围内，翡翠碱聚苯胺可用作传感器。

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