A novel highly sensitive humidity sensor based on poly(pyrrole-co-formyl pyrrole) copolymer film: AC and DC impedance analysis
A novel highly sensitive humidity sensor based on poly(pyrrole-co-formyl pyrrole) copolymer film: AC and DC impedance analysis
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DOI：
10.1016/j.snb.2014.11.111
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发表时间：
2015-03
影响因子：
8.4
通讯作者：
P. Pattananuwat;M. Tagaya;Takaomi Kobayashi
中科院分区：
文献类型：
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作者：
P. Pattananuwat;M. Tagaya;Takaomi Kobayashi
采用旋涂法制备了一种新型的吡咯-甲酰基吡咯共聚物（P（Py-co-FPy））湿敏元件。用红外光谱（FT-IR）对P（Py-co-FPy）膜的化学结构进行了表征。通过场发射扫描显微镜（FE-SEM）和原子力显微镜（AFM）分析了使用不同的旋涂机转速生产的材料观察到的明显不同的纳米畴形态和表面粗糙度。从阻抗、电容和复阻抗特性等方面研究了传感膜的电湿响应特性。传感膜的阻抗特性对相对湿度（RH）和频率操作高度敏感。P（Py-co-FPy）感测膜的连续型湿度是高度敏感的;阻抗在100 Hz下从11%到97%的RH值变化5461次。P（Py-co-FPy）敏感膜在相对湿度从30%变化到90%时响应迅速，响应时间为5 s。在吸附-脱附过程中，敏感膜的响应产生一个小的滞后。使用指数函数计算实验数据，揭示了阻抗参数和%RH之间的良好相关性。此外，通过调节影响表面膜的规则性的旋涂速度，可以改善对湿度的阻抗响应。此外，还详细讨论了不同湿度（11-97%RH）下阻抗连续频率（40-200 kHz）之间的关系。
A novel humidity sensor of poly(pyrrole-co-formyl pyrrole) (P(Py-co-FPy)) film was successfully prepared via spin coating during chemical polymerization. The chemical structure of the P(Py-co-FPy) film was confirmed using infrared spectroscopy (FT-IR). The distinctly different nanodomain morphology and surface roughness observed for materials produced using different spin-coater rotation speeds were analyzed by field emission scanning microscopy (FE-SEM) and atomic force microscopy (AFM). The electrical humidity response of the sensing film was studied in terms of impedance, capacitance, and complex impedance properties. The impedance properties of the sensing film were highly sensitive to the relative humidity (RH) and the frequency operation. The resistive-type humidity of the P(Py-co-FPy) sensing film was highly sensitive; the impedance changed 5461 times at 100 Hz from RH values of 11 to 97%. The P(Py-co-FPy) sensing film responded rapidly when the RH changed from 30 to 90% within 5 s. The response of sensing films generated a small hysteresis during the adsorption–desorption processes. The experimental data were calculated using an exponential function, revealing an excellent correlation between the impedance parameters and the %RH. Furthermore, the impedance response against humidity can be improved by modulating the speed of spin coating that had effect on regularity properties of the surface film. In addition, the relationships among continuous frequencies (40–200 kHz) of impedance at different humidity (11–97%RH) were discussed in details.