Ultrafast room temperature synthesis of porous polythiophene via atmospheric pressure plasma polymerization technique and its application to no2 gas sensors

New nanostructured conducting porous polythiophene (PTh) films are directly deposited on substrates at room temperature (RT) by novel atmospheric pressure plasma jets (APPJs) polymerization technique. The proposed plasma polymerization synthesis technique can grow the PTh films with a very fast deposition rate of about 7.0 μm·min−1 by improving the sufficient nucle-ation and fragment of the thiophene monomer. This study also compares pure and iodine (I2)-doped PTh films to demonstrate the effects of I2 doping. To check the feasibility as a sensing material, NO2-sensing properties of the I2-doped PTh films-based gas sensors are also investigated. As a result, the proposed APPJs device can produce the high density, porous and ultra-fast polymer films, and pol-ymers-based gas sensors have high sensitivity to NO2 at RT. Our approach enabled a series of pro-cesses from synthesis of sensing materials to fabrication of gas sensors to be carried out simultane-ously.