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Nano-Welding of Multi-Walled Carbon Nanotubes on Silicon and Silica Surface by Laser Irradiation

1,2,* and 1,2
Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China
Beijing Engineering Research Center of 3D Printing for Digital Medical Health, Beijing University of Technology, Beijing 100124, China
Author to whom correspondence should be addressed.
Academic Editors: Ming-Tsang Lee, Te-Hua Fang and Chien-Hung Liu
Nanomaterials 2016, 6(3), 36;
Received: 10 December 2015 / Revised: 15 January 2016 / Accepted: 20 January 2016 / Published: 24 February 2016
PDF [2071 KB, uploaded 24 February 2016]


In this study, a continuous fiber laser (1064 nm wavelength, 30 W/cm2) is used to irradiate multi-walled carbon nanotubes (MWCNTs) on different substrate surfaces. Effects of substrates on nano-welding of MWCNTs are investigated by scanning electron microscope (SEM). For MWCNTs on silica, after 3 s irradiation, nanoscale welding with good quality can be achieved due to breaking C–C bonds and formation of new graphene layers. While welding junctions can be formed until 10 s for the MWCNTs on silicon, the difference of irradiation time to achieve welding is attributed to the difference of thermal conductivity for silica and silicon. As the irradiation time is prolonged up to 12.5 s, most of the MWCNTs are welded to a silicon substrate, which leads to their frameworks of tube walls on the silicon surface. This is because the accumulation of absorbed energy makes the temperature rise. Then chemical reactions among silicon, carbon and nitrogen occur. New chemical bonds of Si–N and Si–C achieve the welding between the MWCNTs and silicon. Vibration modes of Si3N4 appear at peaks of 363 cm−1 and 663 cm−1. There are vibration modes of SiC at peaks of 618 cm−1, 779 cm−1 and 973 cm−1. The experimental observation proves chemical reactions and the formation of Si3N4 and SiC by laser irradiation. View Full-Text
Keywords: nano-welding; multi-walled carbon nanotubes; laser nano-welding; multi-walled carbon nanotubes; laser

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Yuan, Y.; Chen, J. Nano-Welding of Multi-Walled Carbon Nanotubes on Silicon and Silica Surface by Laser Irradiation. Nanomaterials 2016, 6, 36.

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