| 초록 |
Recently, highly conductive PEDOT (Poly(3,4-Ethylenedioxythiophene)) nanofilm, which is synthesized by an oxidative vapor phase polymerization (VPP) method, has been actively studied since it can be applied to diverse electronic fields such as OTFT, RFID tag, and flexible displays. Film quality of PEDOT electrode essentially depends on the degree of polymerization and surface morphology. Especially, uniform coating of an oxidant on SiO2 surface and suppression of unwanted side reaction during the polymerization are very essential for effective polymerization and homogeneous growth of PEDOT nanofilm. In order to accomplish the goal, a poly-urethane compound as a base inhibitor and PEG-PPG-PEG as an adhesion promotor were added to FeCl3 oxidant solution, and then, vapor phase polymerized PEDOT nanofim was successfully grown on the uniformly oxidant mixture-coated SiO2 surface. Electrical conductivity of the nanofilm grown via the mixed oxidant was largely increased up to 3,660 S/cm whilst that of the film grown via FeCl3 alone was at most 237 S/cm (patent pending). It is thought that such dramatic improvement is mainly due to that both poly-urethane and PEG-PPG-PEG effectively suppress unwanted side reaction and radical growth of the film, thereby resulting in the formation of long enough conjugated double bond polymer backbone and the considerable reduction of micro-scale pores within the film, i.e., a dense film. In order to characterize the properties of PEDOT nanofilm, Field Emission-Scanning Electron Microscope, Attenuated Total Reflection-Infrared Spectrophotometer, 4-point probe, optical microscopy were utilized throughout the study. In the very near future, the highly conductive PEDOT nanofilm will be tested as a transparent electrode of the next-generation touch screen panel. |
