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Radio-Frequency/Microwave Characteristics of Conducting Polymers and Their Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (15 June 2020) | Viewed by 6945

Special Issue Editor

Department of Physics Education, Daegu University, Gyeongsan 38453, Korea
Interests: radio frequency; microwave; gas-sensors; biosensors; electromagnetic materials characterization; microwave circuit model; carbon nanomaterials; graphene
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue, “Radio-Frequency/Microwave Characteristics of Conducting Polymers and Their Applications” will address RF/microwave characterization of organic CP materials, the model and design of CP-RF/microwave devices and circuits, and the processing, technology development, and system of various types for RF/microwave applications.

Conducting polymers (CPs) are organic polymers that conduct electricity or can be semiconductors. The most significant advantage of conducting polymers is their processability, mainly by dispersion. Initially, the primary drivers of development for applications of the microwave region and conductivity properties of CPs were the following: electromagnetic impulse (EMI) shielding; conductive coating and composites for electromagnetic charge dissipation (ESD) or antistatic applications; and passive absorbers for microwave region radiation for radar cross-section (RCS) reduction. However, CPs suffered from low electric conductivity for diverse RF/microwave applications. In recent years, owing to the proposal of diverse synthesis methods for high-conductive CPs, the CPs have received new interest as sensing and industrial materials in the RF/microwave region.

Original papers are solicited on all types of recent CP- and CP composite-based RF/microwave basic research and technological developments, including CP materials science, processes, characterization, designs and models, and systems for their RF/microwave applications. Articles and reviews dealing with the aforementioned research types are very welcome.

Prof. Dr. Hee-Jo Lee
Guest Editor

Manuscript Submission Information

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Keywords

  • Electric conductivity
  • Electromagnetic wave
  • RF/microwave
  • RF/microwave resonant device and circuit
  • RF/microwave gas sensor
  • RF/microwave biosensor
  • Sensing materials
  • Organic materials
  • RF/microwave characterization
  • Conducting polymer
  • Conducting polymers composites

Published Papers (2 papers)

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Research

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9 pages, 1655 KiB  
Article
Microwave Properties of Coplanar Waveguide-Based PEDOT:PSS Conducting Polymer Line in Ethanol Gas Atmosphere
by Hee-Jo Lee, Nathan Jeong and Hyang Hee Choi
Materials 2020, 13(7), 1759; https://doi.org/10.3390/ma13071759 - 09 Apr 2020
Cited by 2 | Viewed by 2374
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 [...] Read more.
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 (S21) decreased immediately; moreover, the microwave effective conductivity (σm/w) decreased simultaneously, compared with the ethanol-free PEDOT:PSS line (reference sample). The immediate variations in ΔS21 ( = S21,ethanolS21,free) and Δσm/w ( = σm/w,ethanol − σm/w,free) were approximately 10.2 dB and 2.7 × 104 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. Full article
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Review

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19 pages, 1668 KiB  
Review
Radio-Frequency/Microwave Gas Sensors Using Conducting Polymer
by Chorom Jang, Jin-Kwan Park, Gi-Ho Yun, Hyang Hee Choi, Hee-Jo Lee and Jong-Gwan Yook
Materials 2020, 13(12), 2859; https://doi.org/10.3390/ma13122859 - 25 Jun 2020
Cited by 26 | Viewed by 3998
Abstract
In this review, the advances in radio-frequency (RF) /microwave chemical gas sensors using conducting polymers are discussed. First, the introduction of various conducting polymers is described. Only polyaniline (PANi), polypyrrole (PPy) and poly(3,4-ethylenedioxythiophene) (PEDOT), which are mainly used for gas sensors in RF/microwave [...] Read more.
In this review, the advances in radio-frequency (RF) /microwave chemical gas sensors using conducting polymers are discussed. First, the introduction of various conducting polymers is described. Only polyaniline (PANi), polypyrrole (PPy) and poly(3,4-ethylenedioxythiophene) (PEDOT), which are mainly used for gas sensors in RF/microwave region, are focused in this review. Sensing mechanism of the three conducting polymers are presented. And the RF/microwave characteristics and RF/microwave applications of the three conducting polymers are discussed. Moreover, the gas sensors using conducting polymers in RF/microwave frequencies are described. Finally, the the challenges and the prospects of the next generation of the RF/microwave based chemical sensors for wireless applications are proposed. Full article
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