Interfacial polymerized polyaniline nanofibers and their physical characteristics

초록

Conducting polyaniline (PANI) has distinguished itself from other conducting polymers due to its unique electronic and chemical properties [1-2], and its versatility has made researchers focus on fabricating more and more nanostructured PANI such as micro-hollow spheres, nanofibers, nanorods and etc. by various methods [3-4]. Among these novel PANI products, polyaniline/2-acrylamido-2-methyl-1-propanesulfonic acid (PANI/AMPSA) nanofibers have attracted much attention due to their unique electronic transport properties [5]. In this study, we synthesized PANI/AMPSA nanofibers via an interfacial polymerization technique at 0°C, in which the AMPSA acted as not only a dopant but also a surfactant. In order to get fibril formed PANI/AMPSA with small diameter, we changed initial charge of the oxidant (ammonium persulfate) (APS) to examine its influence on morphology and size. At a fixed mole concentration of AMPSA (1M), the ratio of APS to aniline monomer ranged from 0.1 to 0.5 and 1.25. The influence of molar ratio of dopant to aniline monomer on the morphology and the size for the obtained PANI/AMPSA nanofibers were investigated via SEM and TEM images. TGA data described the process of decomposition in detail for both dopant and PANI, in which the TGA curves showed different amount of bonded AMPSA to the backbone of the PANI due to the different chain structure caused by different synthesizing condition. In addition, electrical conductivity of the PANI/AMPSA nanofibers was found to change little for different experimental conditions. This work was supported by by National Research Foundation (43450-1), Korea (2011).