Kouta Hosono

Structure and properties of plasma polymerized and 4-ethylbenzenesulfonic acid-doped polypyrrole films

Abstract An attempt has been made to study the structural and electrical properties of plasma polymerized and 4-ethylbenzenesulfonic acid-doped polypyrrole films. In order to realize the doping with 4-ethylbenzenesulfonic acid, the plasma-polymerization of pyrrole films were vacuum sealed in glass tube with 4-ethylbenzenesulfonic acid and heat-treated. A comparative study of the infrared spectroscopy, elemental analysis and UV–Vis spectroscopy give information that some pyrrole rings are decomposed to form a three-dimensional network. The doping of 4-ethylbenzenesulfonic acid considerably increases the conductivity of the plasma polymerized pyrrole films.

Synthesis and VOC gas sensing properties of Polypyrrole / MoO3 Nanohybrids

We have prepared polypyrrole (PPy) / MoO 3 nanohybrid thin films and evaluated their volatile organic compound (VOC) gas sensing properties. The (PPy) x MoO 3 thin films have been prepared by intercalation reactions of highly oriented MoO 3 thin films. Intercalation of hydrated sodium ions successfully proceeded without loosing the crystallographic orientation. The (PPy) x MoO 3 thin films was obtained by replacing the hydrated sodium ions with PPy. The (PPy) x MoO 3 thin films can detect formaldehyde gas by increasing in their electrical resistance, whereas they showed no response to toluene.