Comparative Gas-Sensing Studies of EPAA with Aniline Tetramer in the Main/Side Chain and Corresponding Densely/Porous Electro-Spun Films
- 1Department of Textile Technology and Innovation Application Engineering, Chinese Culture University, Yang-Ming-Shan, Taipei City 11114, Taiwan
- 2Department of Chemistry, Chung Yuan Christian University, Chung Li District, Taoyuan City 32023, Taiwan
Abstract
Rapid low-ppm detection of toxic and corrosive hydrogen sulfide (H2S) is essential to protect workers and the public. This research presents the synthesis and gas-sensing application of two electroactive poly(amic acid)s (EPAAs): a linear-type (L-EPAA) and a branched-type (B-EPAA). Synthesized via condensation polymerization using electroactive diamine monomers composed of linear and pendant side-chain double-terminal aniline tetramers, their chemical structures, molecular weight, electroactivity, and conductivity were verified using ATR-FTIR, GPC, cyclic voltammetry, and four-point probe testing. To significantly increase the specific surface area, electrospinning technology was employed to fabricate a porous fiber film (B-EPAA-ES). All samples were deposited onto interdigitated electrodes to evaluate their H2S gas sensing properties. Among the tested results, the electrospun B-EPAA-ES film demonstrated the most outstanding performance, exhibiting a 47.4% response to 10 ppm of H2S with a rapid response time of 53.1 s. Moreover, the sensor displayed remarkable reproducibility (CV of 0.2% over three cycles) and the H2S response is unaffected by other gases. Ultimately, the B-EPAA-ES film combines high processability of poly(amic acid), reversible redox properties of side-chain aniline tetramers, and a large specific surface area. This synergistic combination enables highly repeatable H2S detection and the response is unaffected by other gases.
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BibTeX
@article{chang2026comparative,
title = {{Comparative Gas-Sensing Studies of EPAA with Aniline Tetramer in the Main/Side Chain and Corresponding Densely/Porous Electro-Spun Films}},
author = {Kung-Chin Chang and Ting-Ying Lai and Kun-Hao Luo and Yung-Chen Lin and Yen-Lin Lin and Jui-Ming Yeh},
journal = {Polymers},
year = {2026},
month = oct,
doi = {10.3390/polym18202457},
url = {https://www.mdpi.com/2073-4360/18/20/2457},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Comparative Gas-Sensing Studies of EPAA with Aniline Tetramer in the Main/Side Chain and Corresponding Densely/Porous Electro-Spun Films
AU - Kung-Chin Chang
AU - Ting-Ying Lai
AU - Kun-Hao Luo
AU - Yung-Chen Lin
AU - Yen-Lin Lin
AU - Jui-Ming Yeh
PY - 2026
DA - 2026/10/01
JO - Polymers
DO - 10.3390/polym18202457
UR - https://www.mdpi.com/2073-4360/18/20/2457
AB - Rapid low-ppm detection of toxic and corrosive hydrogen sulfide (H2S) is essential to protect workers and the public. This research presents the synthesis and gas-sensing application of two electroactive poly(amic acid)s (EPAAs): a linear-type (L-EPAA) and a branched-type (B-EPAA). Synthesized via condensation polymerization using electroactive diamine monomers composed of linear and pendant side-chain double-terminal aniline tetramers, their chemical structures, molecular weight, electroactivity, and conductivity were verified using ATR-FTIR, GPC, cyclic voltammetry, and four-point probe testing. To significantly increase the specific surface area, electrospinning technology was employed to fabricate a porous fiber film (B-EPAA-ES). All samples were deposited onto interdigitated electrodes to evaluate their H2S gas sensing properties. Among the tested results, the electrospun B-EPAA-ES film demonstrated the most outstanding performance, exhibiting a 47.4% response to 10 ppm of H2S with a rapid response time of 53.1 s. Moreover, the sensor displayed remarkable reproducibility (CV of 0.2% over three cycles) and the H2S response is unaffected by other gases. Ultimately, the B-EPAA-ES film combines high processability of poly(amic acid), reversible redox properties of side-chain aniline tetramers, and a large specific surface area. This synergistic combination enables highly repeatable H2S detection and the response is unaffected by other gases.
SN - 2073-4360
ER -