Fabrication And Characterization Of Electrically Conducting Polypyrrole Nanomaterials In O/W,W/O Microemulsion

polypyrrole(PPy) is an important type of electrically conducting polymer with many features that could be exploited in many potential applications, such as the developing of batteries, electronic and optical apparatuses, sensors, etc. Owing to its excellent electronic and environmental stability, facile synthesis, especially a unique and reversible doping/ de-doping chemical property, it has attracted considerably scientific interest now. But its main disadvantages are poor thermal stability and poor processability both in the states of melt and solution due to its stiffness of the backbone,which greatly limited the applications of polypyrrole. In order to promote the solubility and processability of the PPy, many studies have been made. At present, the fabrication of PPy in W/O and O/W microemulsion becomes a researching focus . In our paper, the system of DBSA/ isooctane/ water reverse micremulsion was selected to synthesize PPy nanomaterials. Moreover, the possible reaction mechanism was presumed and explained. The reaction time and temperature, molar ratios APS/Py and DBSA/Py were investigated to examine the effects on yield and conductivity, then to obtain the optimum reaction conditions. UV-Vis-NIR, IR, XRD, TG-DTA, TEM were employed to character the products. The study discovers: the products were pyrrole-oligomers and solubalized in some common organic solvents, such as DMF and CHCl3 etc. The synthesized pyrrole-oligomers and the pallet of Li were used as working electrode and counter-electrode respectively to assemble Li-ion battery in order to test its first charging and discharging capability and circulatory property. Under the conditions of constant reaction time, fixed molar ratios of APS/Py and DBSA/Py, the effects of different oxidizers on conductivity, thermal stability and morphologies of the products were investigated. Moreover we chose different systems, such as the systems of DBSA/water , DBSA/alcohol/water,CTAB/water and CTAB/ water(KBr) O/W microemulsion to study the reaction conditions, morphology and conductivity of PPy. The images of TEM discover: the PPy spheres were easily fabricated both in DBSA/alcohol/water and DBSA/water systems; the PPy nanofibers and nanowires using APS as oxidizer synthesized in CTAB/water and CTAB/water(KBr) systems were easily obtained, but the concentration of KBr influenced the morphology of PPy.