Pyo, Ki-Hyun Kim, Ji-Sun Jang, Yoon Hee Kim, Jin-Yeol 2025-11-21T04:38:56Z 2025-11-21T04:38:56Z 2025-11-11 2025-10 2227-9040 https://pubs.kist.re.kr/handle/201004/153623 We synthesized emeraldine salts of poly(aniline-co-aniline-2-sulfonic acid) capped with camphorsulfonic acid (CSA), forming spherical nanoparticles (NPs), i.e., CSA-capped P(ANi-co-ASNi), and demonstrated their efficacy as gas sensor elements. The synthesized core-shell spherical NPs, averaging 265 nm in diameter, feature a CSA shell with a porous thin-film morphology, characterized by the uneven distribution of fine particulate domains across the outer surface of the positively charged P(ANi-co-ASNi) cores. This uniquely heterogeneous shell architecture facilitates stable charge transport at the core-shell interface, enhances resistance to ambient humidity, and promotes efficient interaction with organic gas molecules. The CSA-capped P(ANi-co-ASNi) sensors reliably detected low concentrations of acetone (1-5 ppm) and water vapor (1-28% RH) under ambient conditions. Furthermore, the sensors exhibited superior stability across varying temperature, humidity, and cyclic performance, outperforming conventional pure PANiNi. English MDPI AG Synthesis of CSA-Capped Poly(aniline-co-aniline-2-sulfonic acid) Spherical Nanoparticles for Gas Sensor Applications Article 10.3390/chemosensors13100364 1 Chemosensors, v.13, no.10 Chemosensors 13 10 Y scie scopus 001602317700001 2-s2.0-105020014110 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article POLYANILINE FABRICATION NANOCOMPOSITE POLYPYRROLE TEMPERATURE PERFORMANCE COMPOSITE acetone gas sensor poly(aniline-co-aniline-2-sulfonic acid) room temperature spherical nanoparticles