成核
碳纳米管
透射电子显微镜
材料科学
催化作用
纳米技术
化学工程
石墨烯
碳纤维
电子显微镜
化学物理
结晶学
复合材料
化学
有机化学
光学
复合数
工程类
物理
作者
Ruixue Ma,Lu Qiu,Lili Zhang,Dai‐Ming Tang,Yan Wang,Bingsen Zhang,Feng Ding,Chang Liu,Hui‐Ming Cheng
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-10-13
卷期号:16 (10): 16574-16583
被引量:1
标识
DOI:10.1021/acsnano.2c06012
摘要
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 (111) 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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