Direct Observation of Morphological Evolution of a Catalyst during Carbon Nanotube Forest Growth: New Insights into Growth and Growth Termination

Title
Direct Observation of Morphological Evolution of a Catalyst during Carbon Nanotube Forest Growth: New Insights into Growth and Growth Termination
Authors
정서정이재근김환철황준연구본철Dmitri N. ZakharovBenji MaruyamaEric A. Stach김승민
Keywords
Carbon Nanotube Array; Growth termination; Lifted Catalysts; In-situ TEM
Issue Date
2016-01
Publisher
Nanoscale
Citation
VOL 8, 2055-2062
Abstract
In this study, we develop a new methodology for transmission electron microscopy (TEM) analysis that enables us to directly investigate the interface between carbon nanotube (CNT) arrays and the catalyst and support layers for CNT forest growth without any damage induced by a post-growth TEM sample preparation. Using this methodology, we perform in situ and ex situ TEM investigations on the evolution of the morphology of the catalyst particles and observe the catalyst particles to climb up through CNT arrays during CNT forest growth. We speculate that the lifted catalysts significantly affect the growth and growth termination of CNT forests along with Ostwald ripening and sub-surface diffusion. Thus, we propose a modified growth termination model which better explains various phenomena related to the growth and growth termination of CNT forests.
URI
http://pubs.kist.re.kr/handle/201004/58656
ISSN
20403364
Appears in Collections:
KIST Publication > Article
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