Liu, Hongyu Kuila, Tapas Kim, Nam Hoon Ku, Bon-Cheol Lee, Joong Hee 2024-01-20T13:00:46Z 2024-01-20T13:00:46Z 2021-09-01 2013-03 2050-7488 https://pubs.kist.re.kr/handle/201004/128309 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. English ROYAL SOC CHEMISTRY EXFOLIATED GRAPHITE OXIDE CHEMICAL-REDUCTION FUNCTIONALIZED GRAPHENE POLYMER NANOCOMPOSITES MECHANICAL-PROPERTIES PAPER NANOSHEETS FILMS WATER SHEETS In situ synthesis of the reduced graphene oxide-polyethyleneimine composite and its gas barrier properties Article 10.1039/c3ta01228j 1 JOURNAL OF MATERIALS CHEMISTRY A, v.1, no.11, pp.3739 - 3746 JOURNAL OF MATERIALS CHEMISTRY A 1 11 3739 3746 scie scopus 000315168100030 2-s2.0-84876549371 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article EXFOLIATED GRAPHITE OXIDE CHEMICAL-REDUCTION FUNCTIONALIZED GRAPHENE POLYMER NANOCOMPOSITES MECHANICAL-PROPERTIES PAPER NANOSHEETS FILMS WATER SHEETS in situ synthesis reduced graphene oxide barrier properties