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    Oriented layered assemblies of graphene nanosheets/Fe3O4 nanoparticles as a superior anode material for lithium ion batteries

    Year: 2020

    Journal: Appl. Surf. Sci., Volume 508, APR 1

    Authors: Jeong, Hee-Sung; Kim, Hyungsub; Jo, Kyoung-Il; Jang, Jiwon; Choi, Jae-Hak; Koo, Jaseung

    Organizations: National Research Foundation of KoreaNational Research Foundation of Korea [2017M2A2A6A01019911, 2018K1A3A7A09057069]

    Keywords: Electrode materials; Graphene oxide nanosheets; Iron oxide nanoparticles; Langmuir-Schaefer deposition; Lithium ion batteries

    The development of more effective electrodes for lithium ion batteries requires increasing the specific surface area and improving the reversible capacity of the materials. We prepared a hybrid multilayer film consisting of graphene oxide (GO) nanosheets and iron oxide (Fe3O4) nanoparticles assembled using the Langmuir-Schaefer (LS) technique. The GO-Fe3O4 hybrid monolayer is formed by ligand exchange between GO suspended in the subphase and oleic acid-coated Fe3O4 nanoparticles dispersed at the liquid-gas interface. Transmission electron microscopy (TEM) and grazing incidence small angle X-ray scattering (GISAXS) results indicate that the GO-Fe3O4 composite monolayer at the interface possesses closely packed hexagonal structure of the Fe3O4 nanoparticles with high coverage upon monolayer compression. The multilayer GO-Fe3O4 hybrid materials were prepared by repeated LS deposition, exhibiting high reversible capacity (similar to 600 mAh g(-1)) and superior cycle stability over 1000 cycles.
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