期刊
ACS NANO
卷 16, 期 10, 页码 16574-16583出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c06012
关键词
single-wall carbon nanotube; in situ TEM; nucleation; Pt catalyst; growth mechanism
类别
资金
- National Natural Science Foundation of China [51802316, 51927803, 52188101, 52130209]
- JSPS KAKENHI [JP20K05281, JP25820336]
- Natural Science Foundation of Liaoning Province [2020-MS-009]
- Liaoning Revitalization Talents Program [XLYC2002037]
- Basic Research Project of Natural Science Foundation of Shandong Province, China [ZR2019ZD49]
- CAS Pioneer Hundred Talents Program
- Institute for Basic Science of South Korea [IBS-R019-D1]
This study reveals the nucleation mechanism of single-wall carbon nanotubes (SWCNTs) from faceted Pt catalysts under atmospheric pressure using a transmission electron microscope. The formation of graphene layers on specific surfaces was found to be the initial stage of SWCNT nucleation, followed by the formation of an annular belt and a hemispherical cap, and then the elongation of the SWCNT. Based on the observations, an annular belt assembly nucleation model and a possible chirality control mechanism are proposed, providing useful guidance for the controlled synthesis of SWCNTs by catalyst design.
Revealing the nucleation and growth mechanism of single-wall carbon nanotubes (SWCNTs) from faceted solid catalysts is crucial to the control of their structure and properties. However, due to the small size and complex growth environment, the early stages and dynamic process of SWCNT nucleation have rarely been directly revealed, especially under atmospheric conditions. Here, we report the atomic-resolved nucleation of SWCNTs from the faces of truncated octahedral Pt catalysts under atmospheric pressure using a transmission electron microscope equipped with a gas-cell. It was found that the graphene layers were initially formed preferentially on specialIntscript surfaces, which then joined together to form an annular belt and a hemispherical cap, followed by the elongation of the SWCNT. Based on the observations, an annular belt assembly nucleation model and a possible chirality control mechanism are proposed for SWCNTs grown from well -faceted Pt catalysts, which provides useful guidance for the controlled synthesis of SWCNTs by catalyst design.
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