화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.25, No.6, 496-499, June, 2017
DOI10.1007/s13233-017-5093-x  Export Citation
Layer-by-Layer Assembly of Graphene on Polyimide Films via Thermal Imidization and Synchronous Reduction of Graphene Oxide
Yuheng Li, Myeon-Cheon Choi, Keuk-Min Jeong, Jae Hoon Jeong, Hyeok-Gi Lee, Gue-Hyun Kim1, †, and Chang-Sik Ha†
  • Department of Polymer Science and Engineering, Pusan National University, Busan 46241, Korea
  • 1Division of Energy and Bio Engineering, Dongseo University, Busan 47011, Korea
E-mail:,
To investigate the effects of holding time after deposition of polyethylenimine (PEI) solution and molecular weight of PEI on the surface morphology of multilayer films prepared by layer-by-layer (LbL) method, polyamic acid (PAA)/PEI/ graphene oxide (GO) films were prepared using different holding times and different molecular weights of PEI. To convert PAA into polyimide (PI), the films were thermally imidized after film deposition. In this process, GO was also converted into partially reduced GO (rGO). The effects of holding time and molecular weight of PEI on the surface morphology and the sheet resistance of PI/PEI/rGO films were investigated. Also, to investigate the effect of rGO on the barrier properties of PI based multilayer film, (PI/PEI/rGO/PEI)6 films were prepared by LbL method. Longer holding time (10 min) and smaller molecular weight (25,000) of PEI lead to relatively flat surfaces, but shorter holding time (5 min) and larger molecular weight (75,000) result in wrinkled and overlapped surfaces. The sheet resistance of PI/ PEI25K/rGO films prepared with holding time 10 and 5 min is 502.1 kΩ/sq and out of range (> 2000 kΩ/sq), respectively. The sheet resistance of PI/PEI75K/rGO films prepared with holding time 10 min is out of range (> 2000 kΩ/sq). Gas transmission rate (GTR) and permeability coefficient of (PI/PEI25K/rGO/PEI25K)6 are lower than those of (PI/PEI75K/rGO/PEI75K)6, respectively.
Keywords:polyimide;graphene;layer-by-layer;surface morphology;barrier property
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