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Synthesis and solid-state NMR structural characterization
of 13C-labeled graphite oxide.
Cai W., Piner R. D., Stadermann F. J., Park S., Shaibat
M. A., Ishii Y., Yang D., Velamakanni A., An S. J., Stoller M., An J.,
Chen D., and Ruoff R. S. (2008)
Science 321, 1815-1817.
doi:
10.1126/science.1162369
ABSTRACT
The detailed chemical structure of graphite oxide (GO), a
layered material prepared from graphite almost 150 years ago and a
precursor to chemically modified graphenes, has not been previously
resolved because of the pseudo-random chemical functionalization of
each layer, as well as variations in exact composition. Carbon-13 (13C)
solid-state nuclear magnetic resonance (SSNMR) spectra of GO for
natural abundance 13C have poor signal-to-noise ratios.
Approximately 100% 13C-labeled graphite was made and
converted to 13C-labeled GO, and 13C SSNMR was
used to reveal details of the chemical bonding network, including the
chemical groups and their connections. Carbon-13-labeled graphite can
be used to prepare chemically modified graphenes for 13C
SSNMR analysis with enhanced sensitivity and for fundamental studies of
13C-labeled graphite and graphene.
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