Synthesis and Characterization of a Conductive Polymer Blend Based on PEDOT:PSS and Its Electromagnetic Applications

The purpose of this study is to prepare a resistive lossy material using conducting polymers for electromagnetic wave absorbers. This paper presents a conductive paste largely composed of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) with a polyurethane binder. The various secondary compou...

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Bibliographic Details
Published in:Polymers 2022-01, Vol.14 (3), p.393
Main Authors: Jang, Hong-Kyu, Kim, Jinbong, Park, Ji-Sang, Moon, Jin Bum, Oh, Jaecheol, Lee, Woo-Kyoung, Kang, Min-Gyu
Format: Article
Language:English
Subjects:
Absorbers
Absorption
Additives
Atomic force microscopes
Atomic force microscopy
Chemical synthesis
Conducting polymers
Electrical resistivity
Electromagnetic radiation
Mechanical properties
Photoelectrons
Physical properties
Polymer blends
Polyurethane resins
Radar absorbers
Rheology
Screen printing
Solvents
Superhigh frequencies
Thin films
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Summary:The purpose of this study is to prepare a resistive lossy material using conducting polymers for electromagnetic wave absorbers. This paper presents a conductive paste largely composed of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) with a polyurethane binder. The various secondary compounds are added in small amounts to an aqueous blended solution in order to enhance the electrical and mechanical properties of the conductive thin film. The synthesized conductive paste is characterized through electrical, chemical, and morphological analyses. The electrical conductivity of the thin film is measured using a four-point probe and surface profiler. The chemical and morphological changes are studied in various experiments using a Raman microscope, X-ray photoelectron spectroscopy, a scanning electron microscope, and an atomic force microscope. In order to verify the applicability of the synthesized conductive paste, which is composed of 70 wt% PEDOT:PSS, 30 wt% polyurethane, and secondary additives (DMAE 0.4 wt%, A-187 0.5 wt%, DMSO 7 wt%, Dynol 604 0.1 wt%, PUR 40 2.5 wt%), the Salisbury screen absorber is fabricated and evaluated in the X-band. According to the results, the absorber resonates at 9.7 GHz, the reflection loss is -38.6 dB, and the 90% absorption bandwidth is 3.4 GHz (8.2 to 11.6 GHz). Through this experiment, the applicability of the PEDOT:PSS-based conductive paste is sufficiently verified and it is found that excellent radar-absorbing performance can be realized.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14030393