Journal
SOLID STATE NUCLEAR MAGNETIC RESONANCE
Volume 20, Issue 1-2, Pages 61-73Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/snmr.2001.0030
Keywords
NMR; carbon materials; graphite; PVC; magnetic susceptibility
Ask authors/readers for more resources
C-13 high-resolution solid-state nuclear magnetic resonance (NMR) was employed to study carbon materials prepared through the thermal decomposition of four different organic precursors (rice hulls, endocarp of babassu coconut, peat, and PVC). For heat treatment temperatures (HTTs) above about 600 degreesC, all materials presented C-13 NMR spectra composed of a unique resonance line associated with carbon atoms in aromatic planes. With increasing HTT, a continuous broadening of this resonance and a diamagnetic shift in its central frequency were verified for all samples. The evolution of the magnitude and anisotropy of the magnetic susceptibility of the heat-treated carbon samples with HTT explains well these findings. It is shown that these results are better understood when a comparison is made with the features of the C-13 NMR spectrum of polycrystalline graphite, for which the magnetic susceptibility effect is also present and is much more pronounced. (C) 2001 Academic Press.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available