Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere
This study aims to investigate the microwave properties of coplanar waveguide (CPW)-based poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) conducting polymer line in an ethanol gas atmosphere, with the frequency range of 0.5–2 GHz. For an ethanol-exposed PEDOT:PSS line (test sample...
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MDPI AG
2020-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/7/1759 |
| _version_ | 1797571033809551360 |
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| author | Hee-Jo Lee Nathan Jeong Hyang Hee Choi |
| author_facet | Hee-Jo Lee Nathan Jeong Hyang Hee Choi |
| author_sort | Hee-Jo Lee |
| collection | DOAJ |
| description | This study aims to investigate the microwave properties of coplanar waveguide (CPW)-based poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) conducting polymer line in an ethanol gas atmosphere, with the frequency range of 0.5–2 GHz. For an ethanol-exposed PEDOT:PSS line (test sample), the transmission coefficient (<i>S</i><sub>21</sub>) decreased immediately; moreover, the microwave effective conductivity (σ<i><sub>m/w</sub></i>) decreased simultaneously, compared with the ethanol-free PEDOT:PSS line (reference sample). The immediate variations in Δ<i>S</i><sub>21</sub> ( = <i>S</i><sub>21,ethanol</sub> − <i>S</i><sub>21,free</sub>) and Δσ<i><sub>m/w</sub></i> ( = σ<i><sub>m/w</sub></i><sub>,ethanol</sub> − σ<i><sub>m/w</sub></i><sub>,free</sub>) were approximately 10.2 dB and 2.7 × 10<sup>4</sup> S/m, respectively. Furthermore, in the analysis of the circuit model of the PEDOT:PSS line, the characteristic impedance and distributed elements, i.e., resistance (<i>R</i>) and inductance (<i>L</i>) per length, of the test sample increased, compared with the reference sample. However, upon stopping the exposure to ethanol gas, the microwave properties of the test sample instantaneously recovered to those of the reference sample. According to these critical observations, we could confirm that the coplanar waveguide with a PEDOT:PSS line shows a significant difference in the diverse microwave properties, through rapid response to the ethanol gas at room temperature. |
| first_indexed | 2024-03-10T20:34:40Z |
| format | Article |
| id | doaj.art-60c49bf90a2646988b8d5f364d36ae14 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T20:34:40Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-60c49bf90a2646988b8d5f364d36ae142023-11-19T21:08:06ZengMDPI AGMaterials1996-19442020-04-01137175910.3390/ma13071759Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas AtmosphereHee-Jo Lee0Nathan Jeong1Hyang Hee Choi2Department of Physics Education, Daegu University, Gyeongsan 38453, KoreaSchool of Electrical and Computer Engineering, University of Alabama, Tuscaloosa, AL 35487, USADepartment of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, KoreaThis study aims to investigate the microwave properties of coplanar waveguide (CPW)-based poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) conducting polymer line in an ethanol gas atmosphere, with the frequency range of 0.5–2 GHz. For an ethanol-exposed PEDOT:PSS line (test sample), the transmission coefficient (<i>S</i><sub>21</sub>) decreased immediately; moreover, the microwave effective conductivity (σ<i><sub>m/w</sub></i>) decreased simultaneously, compared with the ethanol-free PEDOT:PSS line (reference sample). The immediate variations in Δ<i>S</i><sub>21</sub> ( = <i>S</i><sub>21,ethanol</sub> − <i>S</i><sub>21,free</sub>) and Δσ<i><sub>m/w</sub></i> ( = σ<i><sub>m/w</sub></i><sub>,ethanol</sub> − σ<i><sub>m/w</sub></i><sub>,free</sub>) were approximately 10.2 dB and 2.7 × 10<sup>4</sup> S/m, respectively. Furthermore, in the analysis of the circuit model of the PEDOT:PSS line, the characteristic impedance and distributed elements, i.e., resistance (<i>R</i>) and inductance (<i>L</i>) per length, of the test sample increased, compared with the reference sample. However, upon stopping the exposure to ethanol gas, the microwave properties of the test sample instantaneously recovered to those of the reference sample. According to these critical observations, we could confirm that the coplanar waveguide with a PEDOT:PSS line shows a significant difference in the diverse microwave properties, through rapid response to the ethanol gas at room temperature.https://www.mdpi.com/1996-1944/13/7/1759coplanar waveguidepoly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)conducting polymergas sensorethanol gas |
| spellingShingle | Hee-Jo Lee Nathan Jeong Hyang Hee Choi Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere Materials coplanar waveguide poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) conducting polymer gas sensor ethanol gas |
| title | Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere |
| title_full | Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere |
| title_fullStr | Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere |
| title_full_unstemmed | Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere |
| title_short | Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere |
| title_sort | microwave properties of coplanar waveguide based pedot pss conducting polymer line in ethanol gas atmosphere |
| topic | coplanar waveguide poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) conducting polymer gas sensor ethanol gas |
| url | https://www.mdpi.com/1996-1944/13/7/1759 |
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