Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34424
標題: Helical Carbon Nanotubes: Catalytic Particle Size-Dependent Growth and Magnetic Properties
作者: Tang, N.J.
林寬鋸
Wen, J.F.
Zhang, Y.
Liu, F.X.
Lin, K.J.
Du, Y.W.
關鍵字: carbon nanotubes
helical structures
catalytic growth
growth
mechanism
magnetic property
chemical-vapor-deposition
large-scale synthesis
microwave-absorption
properties
electronic-structure
formation mechanism
graphitic carbon
nanofibers
purification
morphologies
microscopy
期刊/報告no:: Acs Nano, Volume 4, Issue 1, Page(s) 241-250.
摘要: The exact knowledge of helical carbon nanotube (HCNT) growth mechanism has not yet been completely clarified, and effective synthesis of high-purity helical carbon nanotubes in high yield still remains a tremendous challenge. In this study, HCNTs were synthesized via a catalytic chemical vapor deposition method using Fe nanoparticles as catalysts. We performed systematic experiments to investigate the specific effect of catalytic particle size (CPS) on the selective growth of HCNTs, such as on the morphology, yield, mobility of carbon atoms, and HCNT purity of carbon products. Our study showed that the CPS plays a key role in the selectivity to HCNTs, yield, and morphology of the carbon products, and a small catalytic particle is favorable to HCNT formation. We hope that this result may give a beneficial suggestion to obtain highly pure HCNTs, A CPS-dependent growth mechanism for HCNTs was finally proposed. Magnetic measurements demonstrated that the HCNTs are ferromagnetic properties and show high magnetization at room temperature.
URI: http://hdl.handle.net/11455/34424
ISSN: 1936-0851
文章連結: http://dx.doi.org/10.1021/nn901425r
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