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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12846
Title: Growth and morphology of carbon nanostructures on nickel oxide nanoparticles in catalytic chemical vapor deposition
Authors: Jana M.
Sil, Anjan
Ray S.
Published in: Applied Physics A: Materials Science and Processing
Abstract: The present study explores the conditions favorable for the growth of cylindrical carbon nanostructures such as multi-walled carbon nanotube (MWCNT) and carbon nanofiber by catalytic chemical vapor deposition (CCVD) method using nickel oxide-based catalyst nanoparticles of different average sizes as well as different levels of doping by copper oxide. The role of doping and the average size have been related to the observed melting behavior of nanoparticles of nickel oxide by thermal and diffraction analysis, and the importance of melting has been highlighted in the context of growth of cylindrical nanostructures. In the reducing environment prevailing in the CCVD chamber due to decomposition of flowing acetylene gas at elevated temperature, there is extensive reduction of oxide nanoparticles. Lack of melting and faster flow of carbon-bearing gases favor the formation of a carbon deposit cover over the catalyst nanoparticles giving rise to the formation of nanobeads. Melting allows rapid diffusion of carbon from the surface to inside catalyst particles, and reduced flow of gas lowers the rate of carbon deposit, both creating conditions favorable for the formation of cylindrical nanostructures, which grows around the catalyst particles. Smaller particle size and lower doping favor growth of MWCNT, while growth of fiber is commonly observed on larger particles having relatively higher level of doping. © 2014, Springer-Verlag Berlin Heidelberg.
Citation: Applied Physics A: Materials Science and Processing (2014), 117(3): 1425-1436
URI: https://doi.org/10.1007/s00339-014-8568-z
http://repository.iitr.ac.in/handle/123456789/12846
Issue Date: 2014
Publisher: Springer Verlag
ISSN: 9478396
Author Scopus IDs: 35292504600
7003754102
7402322460
Author Affiliations: Jana, M., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Sil, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Ray, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India, School of Engineering, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175 001, India
Corresponding Author: Ray, S.; Department of Metallurgical and Materials Engineering, Indian Institute of Technology RoorkeeIndia
Appears in Collections:Journal Publications [MT]

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