期刊
SMALL
卷 15, 期 46, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201903896
关键词
chirality; low temperature; single-walled carbon nanotubes; solid catalysts
类别
资金
- Ministry of Science and Technology of China [2016YFA0200101, 2016YFA0200104]
- National Natural Science Foundation of China [51432002, 21790052, 51720105003]
- Beijing Municipal Science and Technology Planning Project [Z161100002116026]
- China Postdoctoral Science Foundation [8201400852, 8201400892]
Currently, designing solid catalysts at high temperature is the main strategy to realize single-walled carbon nanotubes (SWNTs) with specific chirality, meaning it is very hard and challenging to create new catalysts or faces to fit new chirality. However, low temperatures make most catalysts solid, and developing solid catalysts at low temperature is desired to realize chirality control of SWNTs. A rational approach to grow SWNTs array with different chiralities on same solid Co catalysts at low temperature (650 degrees C) is herein put forward. Using solid Co catalysts, near-armchair (10, 9) tubes horizontal array with approximate to 75% selectivity and (12, 6) tubes array with approximate to 82% are realized by adopting a small amount of ethanol and large amount of CO respectively. (10, 9) tubes are enriched for thermodynamic stability and (12, 6) tubes for kinetics growth rate. Both kinds of tubes show a similar symmetry to the Co (1 1 1) face with threefold symmetry for the symmetry matching nucleation mechanism proposed earlier. This method provides a new strategy to study the nucleation mechanism and more possibilities for preparing new solid catalysts to control the structure of SWNTs.
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