Magnetic susceptibility effects on 13C MAS NMR spectra of carbon materials and graphite

被引:68
作者
Freitas, JCC [1 ]
Emmerich, FG
Cernicchiaro, GRC
Sampaio, LC
Bonagamba, TJ
机构
[1] Univ Fed Espirito Santo, Dept Fis, BR-29060900 Vitoria, Espirito Santo, Brazil
[2] Ctr Brasileiro Pesquisas Fis, Dept Mat Condensada & Espectroscopia, BR-22290180 Rio De Janeiro, Brazil
[3] Univ Sao Paulo, Inst Fis Sao carlos, BR-13560970 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
NMR; carbon materials; graphite; PVC; magnetic susceptibility;
D O I
10.1006/snmr.2001.0030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:61 / 73
页数:13
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