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Nitroxide-Functionalized Graphene Oxide from Graphite Oxide.

Yazmin I Avila-Vega1, Cesar C Leyva-Porras1, Marcela Mireles2

  • 1Centro de Investigación en Materiales Avanzados S. C. (CIMAV-Unidad Monterrey), Av. Alianza Norte 202, Autopista Monterrey-Aeropuerto Km 10, PIIT, Apodaca-Nuevo León, México, C.P. 66600. Tel/

Carbon
|December 19, 2013
PubMed
Summary
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Researchers developed a straightforward method to create functionalized graphene oxide single layers with nitroxide groups. These novel graphene oxide materials enhance Nylon 6 properties, improving tensile stress, strain, and Young

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Graphene oxide (GO) is a promising material for composite applications.
  • Functionalization of GO is crucial for tailoring its properties and enhancing interfacial interactions.
  • Nitroxide groups offer unique chemical reactivity and potential for property modification.

Purpose of the Study:

  • To develop a facile method for preparing functionalized graphene oxide single layers with nitroxide groups.
  • To investigate the functionalization and exfoliation mechanisms.
  • To evaluate the performance of these functionalized GO materials in Nylon 6 matrices.

Main Methods:

  • Modified Hummer's method for high oxidation graphite oxide preparation.
  • One-step functionalization and exfoliation using oxoammonium salts (OS).

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  • Characterization using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), HRTEM, and electron diffraction.

    • Main Results:

    • Successful preparation of two types of functionalized graphene oxide (GOFT1 and GOFT2) with nitroxide groups.
    • High interlayer spacing (1.12 nm) and presence of C-N and O-O bonds confirmed by XRD and XPS.
    • GOFT1 exhibited amorphous and crystalline zones, while GOFT2 was fully amorphous.
    • Incorporation into Nylon 6 resulted in simultaneous increases in tensile stress, strain, and Young's modulus.

    Conclusions:

    • A facile one-step method for nitroxide-functionalized graphene oxide single layers was established.
    • The functionalized GO materials demonstrate excellent compatibility and reinforcing effects in Nylon 6.
    • These findings highlight the potential of nitroxide-functionalized GO for advanced polymer composites.