Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Nanomaterials Tuesday Sessions
       Session NM-TuP

Paper NM-TuP5
Spontaneous Oxidation and Exfoliation of Graphene Oxide using Couette-Taylor Reactor

Tuesday, December 9, 2014, 4:00 pm, Room Mauka

Session: Nanomaterials Poster Session
Presenter: Hyeongkeun Kim, Korea Electronics Technology Institute
Authors: W.K. Park, Korea Electronics Technology Institute
H. Kim, Korea Electronics Technology Institute
W.S. Yang, Korea Electronics Technology Institute, Republic of Korea
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For the application of reduced graphene oxide to industries, an eco-friendly reduction method and shortening of the pickling and oxidation reaction times in the graphene oxide production process are essential. We dramatically shortened the graphene oxide production time by applying the Couette-Taylor flow, which allows consecutive reactions, to the graphite oxidation process using the modified Hummers method. With a 60-minute oxidation reaction in the Couette-Taylor reactor, the interlayer spacing increased from 0.34 nm to 0.78 nm, and uniform single- to multi-layer graphene oxides were obtained at a high yield of 93%. The properties of fabricated GO was examined by field emission scanning electron microscope, Raman spectra, atomic force microscope, x-ray photoelectron spectroscope and x-ray diffraction.