光电工程, 2020, 47 (9): 190540, 网络出版: 2020-10-27  

纳米氧化锌掺杂液晶/聚合物膜的阻抗谱特性

Impedance spectroscopy characteristics of nano ZnO doped liquid crystal/polymer film
朱清 1,2,*刘悠嵘 1,2江志鹏 1,2郑继红 1,2
作者单位
1 上海理工大学光电信息与计算机学院,上海 200093
2 上海理工大学上海市现代光学系统重点实验室,上海 200093
摘要
本文研究了采用纳米氧化锌棒掺杂的聚合物分散液晶(PDLC)的电阻抗谱特性及其传感应用。利用聚合物分散液晶薄膜具有稳固结构、能抵御机械冲击、容易制备等特点,在材料中掺杂纳米氧化锌棒,通过电阻抗谱性质分析,实现对极性分子如乙醇气体的传感功能。通过对比实验,研究分析了薄膜在遇到乙醇分子时的复阻抗谱的变化,并建立了电化学等效电路,发现该薄膜能有效地实现对乙醇分子的传感功能。并进一步分析研究了该检测传感的灵敏度和响应时间等特性。结果表明,以纳米氧化锌棒掺杂 PDLC薄膜有望作为检测乙醇等极性的气体传感器,具有高灵敏度、结构稳定、重复性高、易于制造等优点。
Abstract
In this paper, the electrical impedance spectroscopy characteristics of polymer dispersed liquid crystal (PDLC) doped with nano-zinc oxide rods and its sensing applications are studied. Polymer dispersed liquid crystal films have the characteristics of stable structure, resistance to mechanical impact and easy preparation. By doping nano-zinc oxide rods into the material, the sensing function of polar molecules such as ethanol gas can be realized through the analysis of electrical impedance spectroscopy. In this paper, the complex impedance spectra of thin films encountering ethanol molecules are studied and analyzed through comparative experiments. In addition, the elec-trochemical equivalent circuit was established and analyzed. It was found that the film could sensitively and effec-tively realize the sensing function of the ethanol molecules. The sensitivity and response time of the sensor are fur-ther analyzed and studied. The experimental study and analysis show that nano-zinc oxide rod doped PDLC film is expected to be used as a gas sensor for detecting polarity of ethanol and other materials. It has the advantages of high sensitivity, stable structure, high repeatability, and easy fabrication.

朱清, 刘悠嵘, 江志鹏, 郑继红. 纳米氧化锌掺杂液晶/聚合物膜的阻抗谱特性[J]. 光电工程, 2020, 47(9): 190540. Zhu Qing, Liu Yourong, Jiang Zhipeng, Zheng Jihong. Impedance spectroscopy characteristics of nano ZnO doped liquid crystal/polymer film[J]. Opto-Electronic Engineering, 2020, 47(9): 190540.

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