|
| Abstract: |
| Electrical conductivity and pH sensitivity of nano-PANI membrane was studied. In this work, an ordered porous nano-polyaniline/acrylate gel polymer (PAGP) membrane was prepared from methyl methacrylate (MMA)/acrylic acid (AA)/nano-PANI bicontinuous microemulsions. The morphology, electric conductivity and pH sensitivity of the composite membrane were studied using scanning electronic microscopy, atomic force microscopy, and electrochemical impedance spectroscopy. It was found that the polymer matrix comprises of two types of proton migrating tunnels: interconnect hydrophilic trench (IHT) and continuous amphiphilic matrix (CAM). The increase of doped nano-PANI particles in those channels leads to a formation of three dimension grain-boundary network. It contributes to the short response time and good reversibility of the sensors. Impedance changes in the low-frequency region reveal an inductive behavior to PANI membrane, which maybe the contribution of faradaic pseudocapacitance of the polymer materials. |
| Key words: nano-PANI porous structure migrating tunnels inductive behavior pH sensitivity |
| DOI：10.11916/j.issn.1005-9113.15273 |
| Clc Number:Ql53.12 |
| Fund: |
|
| Descriptions in Chinese: |
| 纳米多孔聚苯胺复合膜的导电性和pH敏感性 赵 杰1，李 宁2 （1.华南理工大学 机械与汽车工程学院；2.哈尔滨工业大学 化工与化学学院） 创新点说明：（1）采用微乳液聚合的方法制备了高导电的纳米有序多孔聚苯胺复合膜； （2）两种质子迁移隧道的存在使复合膜形成了三维的网状结构，大大缩短了材料的响应时间，提高了材料的响应可逆性。 研究目的： 制备结构有序的纳米聚苯胺复合膜，提高其导电性和敏感特性，实现其在超级电容器和pH传感器领域的有效应用。 研究方法： 采用微乳液聚合的方法，制备MMA/AA/PANI-DBSA/PVP/H2O的微乳液聚合体系。绘制三元相图，找出双连续相微乳液相区，并对双连续相微乳液聚合工艺进行优化，合成具有较高导电性、多孔性、均一透明、机械性能强的聚苯胺复合膜。讨论了聚合物材料的形态结构、导电性能以及pH敏感性。 使用的主要设备有：Park Systems公司的原子力显微镜，Gamry Inc公司的电化学工作站，以及JEOL的JSM6330F扫描隧道显微镜。 结果： （1） 获得了有序的纳米多孔聚苯胺复合膜； （2）复合膜中两种类型质子迁移隧道的存在提高了材料的响应特性和敏感可逆性； （3）聚苯胺复合膜的导纳行为大大提高了其电导特性。 结论： 高导电纳米多孔聚苯胺复合材料的制备可以实现其在电催化材料与传感器方面的有效应用。 关键词： 纳米聚苯胺；多孔结构；迁移通道；感抗行为；pH敏感性 |
