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Defects in carbon nanostructures.

O Zhou, R M Fleming, D W Murphy

    Science (New York, N.Y.)
    |March 25, 1994
    PubMed
    Summary
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    Carbon nanotubes exhibit a unique "paper-mache" structure, challenging the traditional "Russian doll" model. Their electronic properties differ significantly from graphite, revealing a highly defective, turbostratic graphite-like local structure.

    Area of Science:

    • Materials Science
    • Nanotechnology
    • Condensed Matter Physics

    Background:

    • Previous studies proposed a "Russian doll" model for carbon nanotubes (CNTs) based on hollow concentric cylinders.
    • This model suggested limited accessibility to the interior of CNTs.

    Purpose of the Study:

    • To investigate the structural and electronic properties of carbon nanotubes and nanoparticles.
    • To challenge the existing "Russian doll" structural model using advanced characterization techniques.

    Main Methods:

    • Bulk physical and chemical property measurements.
    • High-resolution electron microscopy (HREM) before and after potassium intercalation/deintercalation.
    • Direct current magnetization and electron spin resonance (ESR) measurements.

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    Main Results:

    • Carbon nanostructures demonstrated compressibility similar to graphite along the c-axis and were intercalated by potassium and rubidium to MC(8).
    • HREM revealed a "paper-mache" structure composed of smaller graphite layers, contradicting the "Russian doll" model.
    • Magnetization and ESR indicated distinct electronic properties compared to graphite, despite a local structure resembling turbostratic graphite.

    Conclusions:

    • The "Russian doll" model is inadequate for describing the studied carbon nanostructures.
    • The "paper-mache" model better represents the interconnected, layered structure of these nanoparticles.
    • These nanostructures possess unique electronic characteristics and a high degree of defects, similar to turbostratic graphite.