期刊
ACS NANO
卷 4, 期 12, 页码 7708-7716出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn102602a
关键词
single-walled; nanotubes; electron paramagnetic resonance; ultracentrifugation
类别
资金
- Glasstone Fund
- Brasenose College, Oxford
- Royal Society
- EPSRC [GR/S15808/01]
- EPSRC [EP/D048559/1, EP/H025952/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H025952/1, EP/D048559/1, GR/S15808/01] Funding Source: researchfish
Electron paramagnetic resonance of single-walled carbon nanotubes (SWCNTs) has been bedevilled by the presence of paramagnetic impurities. To address this, SWCNTs produced by laser ablation with a nonmagnetic PtRhRe catalyst were purified through a multiple step centrifugation process in order to remove amorphous carbon and catalyst impurities. Centrifugation of a SWCNT solution resulted in sedimentation of carbon nanotube bundles containing clusters of catalyst particles, while isolated nanotubes with reduced catalyst particle content remained in the supernatant. Further ultracentrifugation resulted in highly purified SWCNT samples with a narrow diameter distribution and almost no detectable catalyst particles. Electron paramagnetic resonance (EPR) signals were detected only for samples which contained catalyst particles, with the ultracentrifuged SWCNTs showing no EPR signal at X-band (9.4 GHz) and fields < 0.4 T.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据