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Journal of Nanomaterials
Volume 2019, Article ID 4380435, 7 pages
https://doi.org/10.1155/2019/4380435
Research Article

Laser Irradiation-Hindered Growth of Small-Diameter Single-Walled Carbon Nanotubes by Chemical Vapor Deposition

1Key Laboratory of Eco-Chemical Engineering, Ministry of Education, Taishan Scholar Advantage and Characteristic Discipline Team of Eco-Chemical Process and Technology, College of Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
2College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China
3Haier Smart Technology R&D Co. Ltd., No. 1 Haier Road, Qingdao 266101, China
4School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
5School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Correspondence should be addressed to Chunfeng Lao; moc.reiah@oalfc and Maoshuai He; moc.liamg@iauhsoameh

Received 15 March 2019; Revised 4 May 2019; Accepted 13 May 2019; Published 27 May 2019

Academic Editor: Albert Nasibulin

Copyright © 2019 Yunlei Fu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

SWNTs are synthesized on a Co/MgO catalyst using “laser-disturbed” CVD with CO as the carbon source. Compared with SWNTs grown by thermal CVD without laser irradiation (normal CVD), SWNTs synthesized under laser irradiation demonstrate the suppression of small-diameter SWNT growth, as indicated by Raman spectroscopy. Such a phenomenon is also observed for other supported catalysts, such as Co/SiO2 and Fe/MgO. Controlled experiments were carried out to clarify the effects of lasers. On the one hand, laser irradiation increases the reaction temperature locally, favoring the growth of SWNTs at a set temperature as low as 350°C. On the other hand, laser irradiation inhibits the nucleation of small SWNT caps, leading to the growth of large-diameter SWNT species. This work opens a new avenue for growing SWNTs with controlled diameters.