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

A carbon nanotube array and carbon nanotube technology, applied in the field of dry adhesion, can solve the problems of high pre-pressure, increased defect rate, unfavorable adhesion, etc., and achieve the effect of reducing pre-pressure and improving adhesion

Active Publication Date: 2018-03-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Oriented carbon nanotube array terminal grafted carboxyl group

[0037] The end of the aligned carbon nanotube array is carboxylated by plasma treatment, and the negative charge of the carboxyl group will generate a dipole between the end of the carbon nanotube array and the substrate, increasing the van der Waals force. The preparation process is as follows figure 2 shown.

[0038] Choose CO 2 As the working gas, perform radio frequency plasma treatment, 13.56MHz, working air pressure 30Pa, discharge power 30W, gas flow rate 30sccm, conduct video plasma treatment on the aligned carbon nanotube array, plasma treatment time is 2min, 5min, 10min respectively.

[0039] The experiment is divided into 4 groups: the original aligned carbon nanotube array without plasma treatment is used as the comparison group, numbered (1); according to the treatment time of 2min, 5min, and 10min, the numbers are sequentially numbered (2)-(4).

[0040] The XPS detection spectra ...

Embodiment 2

[0058] Example 2 Oriented carbon nanotube array ends grafted with fluorine groups

[0059] Through plasma treatment, the end of the aligned carbon nanotube array is grafted with fluorine groups, and the negative charge of the fluorine group will generate a dipole between the end of the carbon nanotube array and the substrate, thereby improving the van der Waals force, as image 3 shown.

[0060] in CF 4 For the plasma, the aligned carbon nanotube array is placed in the reaction chamber of the radio frequency plasma device, 13.56MHz, vacuumed to a vacuum degree of 100mtorr, the discharge power is 30W, the gas flow rate is 250sccm, and the plasma treatment time is 0.5min, 1min, 1.5min respectively , 2min, 2.5min, 3min.

[0061] The experiment is divided into 5 groups: the original aligned carbon nanotube array without plasma treatment is used as the comparison group, numbered (1); according to the treatment time of 0.5min, 1min, 1.5min, 2min, 2.5min, 3min, the numbers are sequ...

Embodiment 3

[0074] Example 3 Oriented carbon nanotube array terminal grafted amino group

[0075] The end of the aligned carbon nanotube array is aminated by plasma treatment, and the positive charge of the amino group will generate a dipole between the end of the carbon nanotube array and the substrate, increasing the Van der Waals force. The schematic diagram of the preparation process is shown in Figure 4 mentioned.

[0076] Take NH 3 As working gas, RF power supply, 18kHz, into NH 3 (5% by volume) and Ar (95% by volume) mixed gas, the gas flow rate is 3L / min, the discharge power is 80W, and the treatment time is 1, 2, 3, 4, 5 min in turn.

[0077] Table 7 shows the adhesion strength of carbon tubes after the above treatment time:

[0078] Table 7 NH 3 Adhesion strength of carbon nanotube arrays after plasma treatment

[0079]

[0080] It can be seen from Table 7 that as the processing time increases, the adhesion strength first increases and then decreases, reaching a maximum...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/552
CPCG01N21/553
Inventor 何青松戴振东陆明月姬科举李阳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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