Article
  • Effect of the Chemical Structure of the Oxidants on the Opto-electronic Properties of Polypyrrole Thin Film
  • Dae-Dong Park, Selvam Samayanan , and Jin-Heong Yim

  • Division of Advanced Materials Engineering, Kongju National University, 1223-34 Cheonan way, Cheonan 31080, Korea

  • 산화제의 화학구조가 폴리피롤 박막의 광-전기적 특성에 미치는 영향
  • 박대동 · Selvam Samayanan · 임진형

  • 공주대학교 공과대학 신소재공학부

  • Reproduction, stored in a retrieval system, or transmitted in any form of any part of this publication is permitted only by written permission from the Polymer Society of Korea.

Abstract

In this study, three types of iron(III)-alkylbenzensulfonate-based oxidizing agents with different alkyl groups lengths were synthesized. Using the prepared oxidizing agents, polypyrrole (PPy) was synthesized by vapor phase polymerization (VPP) to investigate how the chemical structure of the oxidizing agent affects the morphology and opto-electric properties of the prepared PPy thin film. As the chain length of the alkyl group on the para position in the benzene ring of the oxidant was shortened, the transmittance of the PPy thin film decreased. It is postulated that the shorter the length of alkyl group in the oxidant, the smaller the steric hindrance to the dopant becomes, forming a thick PPy thin film, thereby reducing the transmittance of the thin film. The electrical conductivity of the thin film increased as the chain length of the alkyl group in the oxidant decreased. It might be due to the fact that the oxidizing agent without an alkyl group (oxidant-A0) has the smallest electron donating effect resulting in the decrease in the size of the produced PPy particles. The interfacial conductive area would be increased in the PPy thin film formed by the interconnection of small PPy particles


본 연구에서 알킬기의 길이가 다른 세가지 종류의 iron(III)-alkylbenzensulfonate계 산화제를 합성하였다. 제조된 산화제들을 이용하여 폴리피롤(PPy)을 기상중합법(vapor phase polymerization; VPP)으로 제조하여 산화제의 화학구조가 PPy 박막의 형태학 및 광-전기적 특성에 어떤 영향을 끼치는지 알아보고자 하였다. 산화제의 벤젠 고리의 파라위치에 있는 알킬기 사슬 길이가 짧아질수록 박막의 투과도는 감소하였다. 이는 산화제 알킬기 길이가 짧아질수록 도판트로써 입체장애가 상대적으로 작아져 두꺼운 PPy 박막을 형성하여 투과도가 감소한다고 생각된다. 산화제의 알킬기 사슬 길이가 짧아질수록 박막의 전기전도도는 증가하였다. 알킬기가 없는 산화제(oxidant-A0)는 전자공여효과가 가장 작아 생성되는 PPy 입자 크기의 감소에 따른 박막의 전도 계면이 넓어졌기 때문이라 생각된다.


Keywords: conducting polymer, vapor phase polymerization, iron(Ⅲ)-alkylbenzensulfonate, opto-electrical properties

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2021; 45(3): 443-449

    Published online May 25, 2021

  • 10.7317/pk.2021.45.3.443
  • Received on Jan 4, 2021
  • Revised on Feb 4, 2021
  • Accepted on Feb 18, 2021

Correspondence to

  • Samayanan and Jin-Heong Yim
  • Division of Advanced Materials Engineering, Kongju National University, 1223-34 Cheonan way, Cheonan 31080, Korea

  • E-mail: sselvam222@gmail.com, jhyim@kongju.ac.kr