University of Oulu

Olli Pitkänen, Amelia H.C. Hart, Robert Vajtai, Pulickel M. Ajayan, Krisztian Kordas, Maskless direct growth of carbon nanotube micropatterns on metallic substrates, Carbon, Volume 140, 2018, Pages 610-615, ISSN 0008-6223,

Maskless direct growth of carbon nanotube micropatterns on metallic substrates

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Author: Pitkänen, Olli1; Hart, Amelia H.C.2; Vajtai, Robert2;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014 University of Oulu, Finland
2Department of Material Science and NanoEngineering, Rice University, Houston, TX, 77005, United States
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 4.7 MB)
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Language: English
Published: Elsevier, 2018
Publish Date: 2020-08-27


Herein, we report on a simple process, which is suitable for producing carbon nanotube micropatterns on steel alloys without the use of catalyst deposition. The method is based on a pulsed laser beam induced surface microstructuring process, followed by a thermal chemical vapor deposition growth of carbon nanotubes that emerge exclusively from the surface areas of the alloys previously exposed to the laser pulses. As concluded from X-ray diffraction, electron microscopy, Raman and X-ray photoelectron spectroscopy analyses of pristine and laser treated surfaces, the area-selective growth is caused by a formation of a thin and nanostructured metal oxide layer during the laser treatment, which is then partially reduced during the subsequent nanotube growth steps. The partially reduced oxide nanoparticles provide catalytic sites for nanotube growth and are also believed to disable diffusion of catalytic metal atoms to the subsurface regions, giving rise to stable catalyst nanoparticle formation and nanotube growth in the chemical vapor deposition step. The proposed method is fast, scalable and has potential for use in multiple applications that require close metal to nanotube contacts with arbitrary microscopic pattern definition on two and three-dimensional surfaces such as those used in electromechanical contacts, electrochemical electrodes, field emitters, and thermal interfaces.

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Series: Carbon. An international journal founded in conjunction with the American Carbon Society
ISSN: 0008-6223
ISSN-E: 1873-3891
ISSN-L: 0008-6223
Volume: 140
Pages: 610 - 615
DOI: 10.1016/j.carbon.2018.08.047
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
221 Nanotechnology
Funding: We acknowledge the support received from the Micro- and Nanotechnology Center, University of Oulu. O.P. acknowledges Tauno Tonning foundation, Ulla Tuominen foundation, Riitta and € Jorma J. Takanen foundation and Finnish Foundation for Technology Promotion for their support.
Copyright information: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license