After the first report of a conducting polymer (polyacetylene) in 1977 by Shirakawa, Heeger and Mac Diarmid , conducting polymers have attracted the interest of researchers as they show interesting electrical, electronic, magnetic and optical properties. The possibility of combining in these new materials the properties of organic polymers and the electronic properties of semiconductors has been the driving force for various applications [2-4]. Main applications for conducting polymers are based on their electroactivity and conductivity properties. By coating an insulator with a very thin layer of conducting polymer it is possible to prevent the build-up of static electricity. Electromagnetic radiation generated from electrical devices can be absorbed by coating the inside of the plastic casing with a conductive surface .
There are some other applications including anti-corrosion coatings, sensors, batteries and supercapacitors, and more recently light emitting diodes (LEDs) , electrochromic devices  and transparent electrode materials. Among different conducting polymers, great attention has been recently devoted to poly (3,4-ethylenedioxythiophene) (PEDOT), which shows quite high conductivity, stability and optical transparency in its conducting state.