Unique magnetism observed in single-wall carbon nanohorns
Unique magnetism observed in single-wall carbon nanohorns
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DOI：
10.1007/s003390100794
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发表时间：
2001-09
期刊：
影响因子：
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通讯作者：
S. Bandow;F. Kokai;Kunimitsu Takahashi;M. Yudasaka;S. Iijima
中科院分区：
文献类型：
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作者：
S. Bandow;F. Kokai;Kunimitsu Takahashi;M. Yudasaka;S. Iijima
利用电子自旋共振（ESR）和静态磁化率测量研究了单壁碳纳米角（SWNH）的磁性。SWNH在室温真空条件下具有ESR活性，其峰宽（ΔH）约为1.6G.ΔH对O2分压敏感，在O2分压为1大气压时Δ H为53 G，而ESR积分强度与O2分压无关，表现为类居里效应，表明ESR起源于局域电子自旋。SWNHs的抗磁性磁化率的值小于随机取向的石墨的一个数量级，但表现出的幅度与C60和C70的那些。这表明sp2网络碳材料所具有的大的抗磁性将被货车Vleck常数的顺磁性所抵消。
The magnetic properties of single-wall carbon nanohorns (SWNH) were studied by electron spin resonance (ESR) and static magnetic susceptibility measurements. The SWNHs were ESR active with linewidth (ΔH) of ∼6 G in vacuo at room temperature. ΔH was susceptible to the partial pressure of O2and became 53 G at 1 atmospheric pressure of O2, while the integrated ESR intensity was independent on O2pressure and behaved as Curie-like, suggesting an intrinsic ESR origin with localized electron spin character. The diamagnetic susceptibility for SWNHs indicated a value smaller than that of randomly oriented graphite by an order of magnitude, but showing a magnitude comparable to those of C60and C70. It is suggested that the large diamagnetism expecting for sp2networked carbon materials will be canceled by the Van Vleck constant paramagnetism.