有机半导体自组装薄膜及其气敏特性研究

发布时间：2018-11-03 11:13

【摘要】：有机半导体由于制备方法简单、成本低廉、可实现室温或者相对低温的气体敏感特性等优势,逐渐受到人们的密切关注。然而,有机半导体材料还存在成膜工艺复杂、有机膜与传感器件兼容性较差、灵敏度低和响应速率慢等缺点,严重限制了有机半导体气体传感器的发展和应用。因此,本论文以酞菁钴(CoPc),酞菁铜(CuPc)和聚苯胺等有机半导体为例,并研制相应的气体传感器和探索其气敏特性,希望能够改进或者解决以上问题,主要取得如下成果:(1)通过苯酐-尿素法合成酞菁钴有机半导体,继而采用气液界面自组装法制备酞菁钴薄膜。系统研究热激发状态下酞菁钴薄膜对NO_2的气敏特性,并进一步深入探索紫外光激发下酞菁钴薄膜的气敏特性,期望实现对N0_2的室温检测。(2)以聚苯乙烯球阵列薄膜为模板,在电极上通过氧化聚合原位生长聚苯胺空心球阵列薄膜。研究了聚苯胺空心球阵列薄膜对胺类气体的室温检测性能。通过改变聚苯乙烯模板的疏水性能,发现疏水性能够促进聚苯胺空心球的形成;通过采用不同的有机酸掺杂,揭示了聚苯胺气敏性能受有机酸种类的影响及其规律。(3)采用气液界面自组装法制备了无机/有机复合(Cu20/CuPc)敏感薄膜,发现了制备的敏感薄膜对三甲胺(TMA)具有响应能力快速(秒级),灵敏度高和分辨率好等优点,该实验为研制高性能TMA气体传感器提供了新的方法和解决途径。基于以上内容,本论文不仅系统研究了基于有机半导体的气体传感器的制作工艺与气敏特性,还为高性能有机半导体传感器的制备提供了新的设计思路和途径。
[Abstract]:Organic semiconductors have attracted more and more attention due to their advantages such as simple preparation, low cost and the ability to realize gas sensitivity at room temperature or relatively low temperature. However, organic semiconductor materials still have some disadvantages, such as complex film forming process, poor compatibility between organic film and sensor devices, low sensitivity and slow response rate, which seriously limit the development and application of organic semiconductor gas sensors. Therefore, this thesis takes organic semiconductors such as cobalt phthalocyanine cobalt (CoPc), phthalocyanine copper (CuPc) and Polyaniline as an example, and develops the corresponding gas sensor and explores its gas sensing characteristics, hoping to improve or solve the above problems. The main achievements are as follows: (1) Cobalt phthalocyanine thin films were synthesized by phthalic anhydride urea method and then prepared by gas-liquid interface self-assembly method. The gas sensing characteristics of cobalt phthalocyanine film to NO_2 under thermal excitation were studied systematically, and the gas sensing characteristics of cobalt phthalocyanine film under ultraviolet light excitation were further explored. (2) Polystyrene spherical array film was used as template, and the polyaniline hollow sphere array film was grown on the electrode by in situ oxidation polymerization. The room temperature detection properties of Polyaniline hollow sphere array films for amine gases were studied. By changing the hydrophobicity of polystyrene template, it is found that hydrophobicity can promote the formation of Polyaniline hollow spheres. The influence of organic acids on the gas sensitivity of Polyaniline was revealed by doping different organic acids. (3) Inorganic / organic composite (Cu20/CuPc) sensitive films were prepared by gas-liquid interface self-assembly method. It is found that the sensitive film has the advantages of fast response (second order), high sensitivity and good resolution to trimethylamine (TMA). This experiment provides a new method and solution for the development of high performance TMA gas sensor. Based on the above, this paper not only systematically studies the fabrication process and gas sensing characteristics of the gas sensor based on organic semiconductor, but also provides a new design idea and approach for the preparation of high performance organic semiconductor sensor.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O484

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