Abstract
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 nucleation 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 polymers-based gas sensors have high sensitivity to NO2 at RT. Our approach enabled a series of processes from synthesis of sensing materials to fabrication of gas sensors to be carried out simultaneously.
Highlights
In comparison with most of the commercial gas sensors, which are usually based on metal oxides and operated at high temperatures, the gas sensors made of conducting porous polymers have many advantages [5,6,7]
We have developed a nano-porous polymer synthesis method with dry process using a novel atmospheric pressure plasma jets (APPJs) with additional guide tube and bluff body [9,10,11,12,13,14,15,16]
We investigate the NO2 -sensing properties of the I2 -doped conducting porous PTh films in order to check the feasibility for sensing materials of gas sensors
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations Conducting polymers, such as polyaniline (PAni), polypyrrole (PPy), polythiophene (PTh), and their derivatives, have attracted attention to researchers as sensing materials of toxic gases [1,2,3,4]. We have developed a nano-porous polymer synthesis method with dry process using a novel atmospheric pressure plasma jets (APPJs) with additional guide tube and bluff body [9,10,11,12,13,14,15,16]. The nitrogen-containing polymer nanoparticles were successfully synthesized by using aniline and pyrrole monomers via an APPJs polymerization technique. To the authors‘ knowledge, there have been no previous reports on the investigation of the gas sensors based on conducting nano-porous polymers prepared by APPJs polymerization. We investigate the NO2 -sensing properties of the I2 -doped conducting porous PTh films in order to check the feasibility for sensing materials of gas sensors
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