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Coatings 2017, 7(12), 221; https://doi.org/10.3390/coatings7120221

Effect of Hydrogen Concentration on the Growth of Carbon Nanotube Arrays for Gecko-Inspired Adhesive Applications

Institute of Bio-inspired Structure and Surface Engineering, College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Academic Editor: Yasutaka Ando
Received: 18 October 2017 / Revised: 25 November 2017 / Accepted: 2 December 2017 / Published: 5 December 2017
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Abstract

Vertically-aligned carbon nanotubes (VACNTs) have extraordinary structural and mechanical properties, and have been considered as potential candidates for creating dry adhesives inspired by adhesive structures in nature. Catalytic chemical vapor deposition is widely used to grow VACNTs; however, the influential mechanism of VACNT preparation parameters (such as H2 concentration) on its adhesion property is not clear, making accurate control over the structure of VACNTs adhesive an ongoing challenge. In this article, we use electron beam-deposited SiO2/Al2O3 as a support layer, Fe as catalyst, and C2H4/H2 gas mixtures as a feed gas to prepare VACNTs, while varying the ratio of the reducing atmosphere (H2) from 0% to 35%. VACNTs synthesized at a 15% H2 concentration (5 mm × 5 mm in size) can support a maximal weight of 856 g, which indicates a macroscopic shear adhesive strength of 34 N/cm2. We propose a hydrogen-concentration-dependent model for the shear adhesive performance of VACNTs. By adjusting the amount of hydrogen present during the reaction, the morphology and quality of the prepared VACNTs can be precisely controlled, which significantly influences its shear adhesive performance. These results are advantageous for the application of carbon nanotubes as dry adhesives. View Full-Text
Keywords: carbon nanotubes; chemical vapor deposition; hydrogen concentration; adhesion; gecko-inspired carbon nanotubes; chemical vapor deposition; hydrogen concentration; adhesion; gecko-inspired
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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. (CC BY 4.0).
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Li, Y.; Ji, K.; Duan, Y.; Meng, G.; Dai, Z. Effect of Hydrogen Concentration on the Growth of Carbon Nanotube Arrays for Gecko-Inspired Adhesive Applications. Coatings 2017, 7, 221.

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