Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere

Abstract

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 (S 21 ) decreased immediately; moreover, the microwave effective conductivity (σ m/w ) decreased simultaneously, compared with the ethanol-free PEDOT:PSS line (reference sample). The immediate variations in ∆S 21 (= S 21,ethanol − S 21,free ) and ∆σ m/w (= σ m/w,ethanol − σ m/w,free ) were approximately 10.2 dB and 2.7 × 10 4 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 (R) and inductance (L) 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.

Radio-Frequency/Microwave Gas Sensors Using Conducting Polymer

“…PEDOT:PSS undergoes electron transfer and changes in resistance depending on the specific gas. When PEDOT:PSS reacts with electron donors, such as ethanol gas [23] and alkane gas [24], the electric conductance of PEDOT:PSS is enhanced. On the other hand, when PEDOT:PSS reacts with water vapor [25,26], which is an electron acceptor, the electric conductance of PEDOT:PSS is enhanced.…”

Pengaruh Penambahan Titanium Dioksida (TiO2) terhadap Sifat Konduktor dari Polianilin (PANI)

“…PENDAHULUAN Dalam beberapa waktu terakhir, sintesis dan karakterisasi polimer konduktif menjadi salah satu penelitian yang banyak diminati karena aplikasinya di berbagai bidang kehidupan khususnya sensor. Polimer konduktif berbeda dengan polimer pada umumnya yang bersifat isolator, polimer ini merupakan polimer organik yang mampu menghantarkan arus listrik menyerupai bahan semikonduktor [1]. Beberapa polimer konduktif yang sering digunakan khususnya pada sensor gas dan kelembaban diantaranya polypyrole, polythiophene, polyacetylene dan polyaniline [2].…”