Method for preparing gecko-simulative tail end-charged aligned carbon nanotube dry adhesion array

Abstract

The invention discloses a method for preparing a gecko-simulative tail end-charged aligned carbon nanotube dry adhesion array and belongs to the technical field of dry adhesion. Through plasma surfacemodification of an aligned carbon nanotube array obtained by chemical vapor deposition growth and grafting of the tail end of the aligned carbon nanotube array with polar groups such as carboxyl, fluoro, and amino groups, the gecko-simulative tail end-charged aligned carbon nanotube dry adhesion array is obtained. The gecko-simulative tail end-charged aligned carbon nanotube dry adhesion array has high adhesion and can be used in the fields of gecko-simulative robot foot adhesion and solid-to-solid dry adhesion contact.

Description

technical field [0001] The invention relates to the technical field of dry adhesion, in particular to a method for preparing a gecko end-charged and aligned carbon nanotube dry adhesion array. Background technique [0002] Geckos have millions of extremely thin setae, 1mm, on the bottom of each foot 2 There are about 14,400 setae with a length of 30-130 μm on the upper body, and there are nearly 500,000 setae on each foot, and each setae has hundreds of fluff with a length of about 0.5 μm, a width of about 0.2 μm, and a thickness of about 5 nm. The fluff of the foot contacts the contact surface and produces "Van der Waals' force" to complete the attachment of the sole of the foot (Autumn K, et al. PNAS, 2002, 99, 12252-12256.). [0003] A lot of work has been done in the development of gecko-like adhesive arrays at home and abroad, and great progress has been made. The dimensions of the array-adhered struts are in the order of millimeters, microns and nanometers. The prep...

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Problems solved by technology

However, the above research on plasma treatment is only for field emission, energy storage and gas sensing of aligned carbon nanotubes, and there are few researches on dry adhesion applications. Only Xu et al. 2 Plasma surface treatment of aligned carbon nanotubes, leading to agglomeration of carbon tube ends, a nanointerlock mechanism was proposed (Xu M, DuF, Ganguli S, Roy A, Dai L M. Carbon nanotube dry adhesives with temperature-enhanced adhesion over a large temperature range. Nature Communication, 2016, 7, 134501-8.)

But O 2 Plasma severely damages the wall of aligned carbon nanotubes, and the defect rate increases, which is not conducive to improving the adhesion

[0004] The existing problems of aligned carbon nanotube arrays as dry adhesion materials include: too high pre-pressure, further improvement of adhesion, and low reusability of materials (Li Y, Zhang H, Yao Y G, Li T T, Zhang Y Y, Li T T, Zhang Y Y, Li QW, Dai Z D. Transfer of vertically aligned carbon nanotube arrays onto flexible substrates for gecko-inspired dry adhesive application. RSC Advance, 2015, 5, 46749-46759.)

Ruffatto et al. and Berengueres et al. charged dry adhesive materials with an applied electric field to improve adhesion (Ruffatto D, Parness A, Spenko M. Improving controllable adhesion on both rough and smooth surfaces with a hybrid electrostatic / gecko-like adhesive. Journal of the Royal Society ,2014,11,20131089; Berengueres J,Urago M,Saito S,Tadakuma K,Meguro H.Gecko inspired electrostaticchuck.Proceedings of the 2016IEEE International Conference on Robotics and Biomimetics,Dec 17-20,2006,Kunming,China.), also There are no reports of charging the ends of dry adherent materials by plasma treatment

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