Synthesis of sulfonated-doped-polyaniline sphere-shaped nanoparticles for inkjet-printed chemical sensor applications
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Much research about polyaniline has been reported on the fabrication of uniform, pure, and nanometer-sized structures for practical applications such as corrosion protection, chemical sensors, and batteries. In this study, sulfonated polyaniline (SPANi) composed of sphere-shaped nanoparticles was synthesized by using emulsion polymerization for sensing an CO2. We present the fabrication of water-dispersible SPANi nanoparticles and their application to inkjet printing for chemical sensor. The morphological structure and diameter size of the particles was analyzed using SEM and TEM, and chemical and electrical structure was confirmed by FT-IR, UV/vis spectrum. EDS spectrum was used to identify the constituents elements of the atoms. As for sensor characteristics, it was confirmed that the detection for CO2 gas show a high response at concentration of 100ppm. In particular, by introducing -SO3H group to the benzene ring of polyaniline backbone, selectivity to sense CO2 was secured.