Precise Identification of the Active Phase of Cobalt Catalyst for Carbon Nanotube Growth by In Situ Transmission Electron Microscopy.

doi:10.1021/acsnano.0c05542

IMR OpenIR

	Precise Identification of the Active Phase of Cobalt Catalyst for Carbon Nanotube Growth by In Situ Transmission Electron Microscopy.
	Wang, Yang; Qiu, Lu; Zhang, Lili; Tang, Dai-Ming; Ma, Ruixue; Wang, Yongzhao; Zhang, Bingsen; Ding, Feng; Liu, Chang; Cheng, Hui-Ming
	2020-12-04
发表期刊	ACS nano
摘要	Revealing the active phase and structure of catalyst nanoparticles (NPs) is crucial for understanding the growth mechanism and realizing the controlled synthesis of carbon nanotubes (CNTs). However, due to the high temperature and complex environment during CNT growth, precise identification of the active catalytic phase remains a great challenge. We investigated the phase evolution of cobalt (Co) catalyst NPs during the incubation, nucleation, and growth stages of CNTs under near-atmospheric pressure using an in situ close-cell environmental transmission electron microscope (ETEM). Strict statistical analysis of the electron diffractograms was performed to accurately identify the phases of the catalyst NPs. It was found that the NPs belong to an orthorhombic Co3C phase that remained unchanged during CNT growth, with errors in lattice spacing <5% and in angle <2°, despite changes in their morphology and orientation. Theoretical calculations further confirm that Co3C is the thermodynamically preferred phase during CNT growth, with the supply of carbon atoms through the surface and NP-CNT interfacial diffusion.
DOI	10.1021/acsnano.0c05542
WOS记录号	MEDLINE:33275403
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/155646
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Wang, Yang,Qiu, Lu,Zhang, Lili,et al. Precise Identification of the Active Phase of Cobalt Catalyst for Carbon Nanotube Growth by In Situ Transmission Electron Microscopy.[J]. ACS nano,2020.
APA	Wang, Yang.,Qiu, Lu.,Zhang, Lili.,Tang, Dai-Ming.,Ma, Ruixue.,...&Cheng, Hui-Ming.(2020).Precise Identification of the Active Phase of Cobalt Catalyst for Carbon Nanotube Growth by In Situ Transmission Electron Microscopy..ACS nano.
MLA	Wang, Yang,et al."Precise Identification of the Active Phase of Cobalt Catalyst for Carbon Nanotube Growth by In Situ Transmission Electron Microscopy.".ACS nano (2020).