In Situ Monitoring of Electric Dipolar Process on Integrating PANI-DBSA with Ammonia Molecules
12
Issued Date
2025-03-01
Resource Type
ISSN
00134651
eISSN
19457111
Scopus ID
2-s2.0-105000446191
Journal Title
Journal of the Electrochemical Society
Volume
172
Issue
3
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of the Electrochemical Society Vol.172 No.3 (2025)
Suggested Citation
Kumar J., Choudhary A., Afzal M., Sachin, Phor L., Chahal S., Dhawan S.K., Singh D., Kumar D., Singh S.P., Chaudhary V. In Situ Monitoring of Electric Dipolar Process on Integrating PANI-DBSA with Ammonia Molecules. Journal of the Electrochemical Society Vol.172 No.3 (2025). doi:10.1149/1945-7111/adbdf8 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/108492
Title
In Situ Monitoring of Electric Dipolar Process on Integrating PANI-DBSA with Ammonia Molecules
Corresponding Author(s)
Other Contributor(s)
Abstract
We explored the in situ and real-time monitoring of the electric dipolar relaxation during the interaction of ammonia (NH3) gas, a crucial phenomenon in the gas sensing mechanism of conducting polymers, with dodecyl-benzene-sulfonic acid (DBSA)-doped polyaniline (PANI) nanocomposite polymer thin films. Dielectric spectroscopy from 20 Hz to 100 MHz was performed to analyze the dynamical behavior of the interaction process of DBSA-doped PANI nanocomposite polymer thin film with NH3 molecules. Initially, with no NH3 gas, the dielectric measurement showed a negative relative dielectric constant (about −6500 at 20 Hz) at low frequencies, indicating the conducting nature of unadorned DBSA-doped PANI nano-composite thin film (PANI-DBSA). On exposing PANI-DBSA film to NH3, the low frequency dipolar relaxation process was observed in the dielectric spectra. A shift toward the high frequency as a function of NH3 exposure time was observed, elucidating a continuous increase in dielectric strength and density of dipoles in the composite film with increasing exposure time which allows the gas a deeper penetration into the film and hence the increase in the density of dipoles. Removal of NH3 gas from PANI-DBSA allowed the system to retain its previous state,which is significant for sensing applications.