Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Improved Coating of PEDOT : PSS onto CVD Graphene by the Addition of PVA

PVA의 첨가에 의한 CVD 그래핀상 PEDOT : PSS의 코팅성 향상

  • Park, Min Ui (Department of Polymer Engineering, College of Engineering, Suwon University) ;
  • Shin, Chaeyeon (Department of Polymer Engineering, College of Engineering, Suwon University) ;
  • Kim, Hyeji (Department of Polymer Engineering, College of Engineering, Suwon University) ;
  • Kim, Seung Yeon (EverChemTech Co., Ltd) ;
  • Choi, Young Ju (EverChemTech Co., Ltd) ;
  • Chung, Dae-won (Department of Polymer Engineering, College of Engineering, Suwon University)
  • 박민의 (수원대학교 공과대학 신소재공학과) ;
  • 신채연 (수원대학교 공과대학 신소재공학과) ;
  • 김혜지 (수원대학교 공과대학 신소재공학과) ;
  • 김승연 ((주)에버켐텍) ;
  • 최영주 ((주)에버켐텍) ;
  • 정대원 (수원대학교 공과대학 신소재공학과)
  • Received : 2018.08.09
  • Accepted : 2018.09.08
  • Published : 2018.12.10
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Abstract

We successfully coated poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonate) (PEDOT : PSS) on CVD graphene by adding poly(vinyl alcohol) (PVA) to PEDOT : PSS. Extensive studies on the wettability of coating solutions and electrical properties of formed films led us to conclude that PVA with 89% of the degree of saponification and the molecular weight of less than $100,000gmol^{-1}$ produced optimum results. Furthermore, the optimum content of PVA was found to be 5% of PEDOT : PSS by the solid weight. The film coated by PEDOT : PSS with PVA on CVD graphene displayed a conspicuous improvement in the surface roughness, adhesive property, bending durability and stability in resistance at $160^{\circ}C$, compared to those of using CVD graphene films.

PVA를 PEDOT : PSS에 첨가해줌으로써 CVD 그래핀 상에 효과적으로 코팅할 수 있었다. PVA의 검화도 및 분자량에 따른 코팅성 및 필름의 전기적 특성을 검토한 결과, DS는 89%, 분자량은 $100,000gmol^{-1}$ 이하인 것이 바람직하였다. 또한, PVA의 첨가량은 PEDOT : PSS의 고형분 대비 5%가 최적으로 나타났다. 이와 같은 PVA를 사용하여 PEDOT : PSS를 CVD 그래핀 위에 코팅한 필름은 CVD 그래핀 필름에 비해서 표면조도, 부착성, 굴곡 내구성 및 고온($160^{\circ}C$)에서의 저항 안정성 등이 현저하게 개선되는 것으로 나타났다.

Keywords

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Figure 1. Chemical structures of PEDOT : PSS and PVA.

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Figure 2. AFM images of the surface of CVD graphene (A) and CVD graphenes coated by PEDOT : PSS with PVA-1 (B), PVA-2 (C) and PVA-3 (D).

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Figure 3. The change in resistance of CVD graphene and CVD graphenes coated by PEDOT : PSS with PVA-2 with various amounts under 3R bending.

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Figure 4. Surface resistance of CVD graphene and CVD graphenes coated by PEDOT : PSS with PVA-2 with various amounts after incubation at 160 ℃.

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Figure 5. Transmittance of CVD graphene and CVD graphenes coated by PVA-2 only or by PEDOT : PSS with PVA-2 with various amounts after incubation at 160 ℃.

Table 1. Properties of Films Coated with PEDOT : PSS Using Various PVAs on CVD Graphene

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Table 2. Properties of Films Coated by PEDOT : PSS with Various Amount of PVAs on CVD Graphene

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