Structure and electronic states of single-wall carbon nanohorns prepared under nitrogen atmosphere

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• 作者：Ryota Yuge^a ; ^{r-yuge@bk.jp.nec.com" class="auth_mail} ; Shunji Bandow^b ; Kentaro Nakahara^a ; Masako Yudasaka^c ; Kiyohiko Toyama^a ; Takashi Yamaguchi^d ; Sumio Iijima^e ; Takashi Manako^a
• 刊名：Carbon
• 出版年：August 2014
• 年：2014
• 卷：75
• 期：Complete
• 页码：322-326
• 全文大小：979 K

文摘

Nitrogen-doped single wall carbon nanohorns (N-SWCNHs) were prepared by CO₂ laser ablation of a graphite target under nitrogen atmosphere. X-ray photoelectron spectra showed that the doped nitrogen quantities were about 1.7 and 1.1 at.% under nitrogen and nitrogen/Ar mixed atmospheres, respectively. The nitrogen atoms were implicated as the pyridine-like and threefold coordinated sp² bonding in graphene lattice of SWCNHs, and they were p-type dopants. The number of defect sites of N-SWCNHs was larger than that of SWCNHs prepared under Ar atmospheres, which was revealed by Raman and electron spin resonance measurements.