Laser Irradiation-Hindered Growth of Small-Diameter Single-Walled Carbon Nanotubes by Chemical Vapor Deposition. (27th May 2019)

• Record Type: Journal Article
• Authors: Fu, Yunlei; Zhang, Xiuyun; Lao, Chunfeng; Shang, Danhong; He, Maoshuai
• Other Names: Nasibulin Albert Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2019(2019)
• Publication Date: 2019-05-27
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2019/4380435
• Languages: English
• ISSNs: 1687-4110

Abstract

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.