In situ synthesis of the reduced graphene oxide-polyethyleneimine composite and its gas barrier properties
- In situ synthesis of the reduced graphene oxide-polyethyleneimine composite and its gas barrier properties
- Hongyu Liu; Tapas Kuila; 김남훈; 구본철; 이중희
- in situ synthesis; reduced graphene oxide; barrier properties
- Issue Date
- Journal of materials chemistry. A, Materials for energy and sustainability
- VOL 1, NO 11, 3739-3746
- The ternary roles of polyethyleneimine (PEI) as a reducing agent, a surface modifier and a polymer host
have been presented to fabricate reduced graphene oxide (RGO) based composite films with improved
gas barrier property. The PEI functionalized RGO dispersion is prepared and filtered to fabricate thin
films with a brick and mortar structure. The simultaneous reduction and functionalization of graphene
oxide (GO) by PEI are confirmed by Fourier transform infrared spectroscopy, ultraviolet-visible
spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and transmission electron
microscopy analysis. The good dispersion of graphene sheets in the PEI matrix and the layered structure
is confirmed by X-ray diffraction and field emission scanning electron microscopy analyses.
Thermogravimetric analysis also confirms the removal of oxygen functionalities from GO and the
attachment of PEI chains to the RGO sheets. The electrical conductivity of the RGO film is found to be
492 S m-1 at low content of PEI (PEI : GO = 0.02 : 1), and increasing the PEI content leads to a decrease
in the electrical conductivity of the films. In contrast, the water dispersibility and gas barrier properties
increase with increasing PEI content in the composite film.
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