Comparative NMR study of new carbon forms

被引：45

作者：

Maniwa, Y ^{[1
]}

Sato, M ^{[1
]}

Kume, K ^{[1
]}

Kozlov, ME ^{[1
]}

Tokumoto, M ^{[1
]}

机构：

[1] ELECTROTECH LAB,TSUKUBA,IBARAKI 305,JAPAN

来源：

CARBON | 1996年 / 34卷 / 10期

关键词：

NMR; diamond; fullerenes; C-60; carbon nanotube; polymer; hard carbon;

D O I：

10.1016/0008-6223(96)00116-9

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：

A comparative C-13-NMR study of several new phases of pressure/temperature-treated C-60, a bundle of carbon nanotubes, graphite and diamond was carried out in the 4-300 K temperature range. It was found that face-centered cubic and rhombohedral high-pressure phases of C-60 reveal very unusual NMR lines at 110 and 70 ppm, respectively, shifted from that of pristine C-60 (143 ppm). These lines disappear in a hard carbon phase prepared by compression of C-60 at more severe conditions. Comparison with NMR spectra of pristine C-60, diamond and graphite showed that the fullerenes acquire some partial sp(3) character when they are pressure-treated at 3-4.6 GPa and various temperatures (720 degrees C). However they are apparently not transformed into four-fold-coordinated diamond-like carbon clusters. NMR spectra of carbon nanotubes exhibited an anomalous shift which may be attributed to their cylindrical geometry. Copyright (C) 1996 Elsevier Science Ltd

引用

页码：1287 / 1291

页数：5

共 21 条

[1] MAGNETIC ANISOTROPIES OF ALIGNED CARBON NANOTUBES [J].