Article

Article title BIOMIMETIC ADHESION COATING BASED ON CARBON NANOTUBES
Authors O. I. Il’in
Section SECTION I. ELECTRONICS AND NANOTECHNOLOGY
Month, Year 02, 2018 @en
Index UDC 621.38-022.533
DOI 10.23683/2311-3103-2018-2-75-84
Abstract The article presents the results of studies of regularities in the carbon nanotubes growing modes influences by plasma enhanced chemical vapor deposition on the geometric dimensions and adhesion properties of nanotube arrays. The results of experimental studies of the effect of activation time, plasma power, temperature and growth time on the parameters of carbon nanotubes are presented. It is shown that exposure in an ammonia plasma leads to etching of Ni catalytic centers and a decrease in their diameter. With an increase in the "activation" time increases the probability of association of small catalytic centers into larger due to surface diffusion, which leads to an increase in diameter and decrease in the density of carbon nanotubes. It has been established that an increase of the plasma power up to 40 W promotes to complete removal of small catalytic centers and the formation of individual vertically aligned carbon nanotubes. "Activation" time of less than 5 sec promotes an increase in the catalytic centers adhesion to the substrate and allows controlling the growth mechanism. With an increase temperature to 675 ° C, simultaneous processes of sublimation and surface diffusion occur, which leads to a decrease in the diameter, height, and density of carbon nanotubes. Also, temperature increasing leads to an acceleration of the desorption of acetylene from the surface of the sample and the carbon-containing gas is evacuated by the vacuum system without reacting with the catalytic centers. It is established that the absence of a vector of electric field strength which determining the direction of growth of carbon nanotubes leads to the formation of a disoriented arrays of CNTs. It is shown that the management of technological modes makes it possible to growth arrays of carbon nanotubes of various types: interwoven, individual, branched and disoriented. Studies of the adhesion of experimental samples by atomic force microscopy have been carried out. It has been established that the greatest value of the adhesion force (11121 nN) is shown by aligned arrays of carbon nanotubes, which were grouped in bundles during the growing process with the diameter of individual nanotubes 51 nm, height 0.69 μm and density 69 μm-1. The results of the research can be used for creating adhesion coatings and mechanical contacts of high strength for the space industry and robotics, as well as for the creation of elements of carbon nanoelectronics.

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Keywords Carbon nanotubes; plasma enhanced chemical vapor deposition; atomic-force microscope; adhesion coatings.
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