Defects in Carbon Nanostructures

Previous high-resolution electron microscopy (HREM) observations of the carbon nanotubes have led to a "Russian doll" structural model that is based on hollow concentric cylinders capped at both ends. The structures of the carbon nanotubes and particles were characterized here by bulk phys...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1994-03, Vol.263 (5154), p.1744-1747
Main Authors: Zhou, O., Fleming, R. M., Murphy, D. W., Chen, C. H., Haddon, R. C., Ramirez, A. P., Glarum, S. H.
Format: Article
Language:English
Subjects:
360602 - Other Materials- Structure & Phase Studies
360606 - Other Materials- Physical Properties- (1992-)
Alloys
Atoms
CARBON
Carbon allotropes
Chemistry
Compressibility
Computer Simulation
Condensed matter: structure, mechanical and thermal properties
Cylinders
ELECTRICAL PROPERTIES
Electron microscopy
Electron, ion, and scanning probe microscopy
Electronic Equipment
Elemental solids
ELEMENTS
Exact sciences and technology
FULLERENES
Graphite
Materials
MATERIALS SCIENCE
MOLECULAR STRUCTURE
Nanostructures
Nanotechnology
Nanotubes
NONMETALS
Onions
PHYSICAL PROPERTIES
Physics
Scientific imaging
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Transmission, reflection and scanning electron microscopy(including ebic)
TUBES
X ray diffraction
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Summary:Previous high-resolution electron microscopy (HREM) observations of the carbon nanotubes have led to a "Russian doll" structural model that is based on hollow concentric cylinders capped at both ends. The structures of the carbon nanotubes and particles were characterized here by bulk physical and chemical property measurements. The individual nanostructure is as compressible as graphite in the c axis, and such nanostructures can be intercalated with potassium and rubidium, leading to a saturation composition of "MC$_8$." These results are counter to expectations that are based on a Russian doll structure. HREM after intercalation with potassium and deintercalation indicates that individual nanoparticles are a "paper-mache" of smaller graphite layers. Direct current magnetization and electron spin resonance measurements indicate that the electronic properties of the nanostructures are distinctly different from those of graphite. Although the nanostructures have distinct morphologies and electronic properties, they are highly defective and have a local structure similar to turbostratic graphite.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.263.5154.1744