The Mapping Relations Between Microstructure And Adhesion Performance Of Carbon Nanotube Arrays Based Gecko-inspired Dry Adhesive

Carbon nanotube arrays（VACNTs）,with their excellent mechanics,electricity,thermal perfor-mance and robustness in extreme circumstances,become a potential material for gecko-inspired dry adhesives and further application on wall-climbing robots.In this paper,VACNTs was prepared by CVD,and the process parameters were regulated to obtain VACNTs with different morphologies.By evaluating the adhesion mechanics of VACNTs with different morphologies,we have constructed that the mapping relationship between the morphology and adhesion properties of VACNTs.The main results of this paper are as follows:1.By adjusting the thickness of catalyst and buffer layer,we can get catalyst particles with dif-ferent size and distribution patterns,obtaining VACNTs with different orientation,density,diameter and growth rate.Iron thickness initially affects the overall morphology of nanoparticles in the pre-treatment stage.Thereafter,in high temperature and multi atmosphere environment,too thin or too thick iron layer is not conducive to the formation of nanoparticles that can grow VACNTs.The effect of alumina thickness on the catalyst is to enhance the interaction between Fe-Al₂O₃ and inhibit the loss of iron diffusion during the growth process.When the Al₂O₃ thickness=20nm and the Fe thick-ness=2nm,we have obtained the VACNTs with greater adhesion strength,reaching 32 N/cm².2.In view of the"high array with weak adhesion force"problem existing in the actual test,the VACNTs array with different height is obtained by adjusting the deposition time.The experimental results show that the height of the array is positively correlated with the deposition time.We have tested the adhesion properties of VACNTs at different heights,and analyzed the influence mechanism of the array height on the adhesion properties.3.Through analysising microstructure observation（TEM,SEM,Raman,AFM）,combined with the adhesion performance,we have constructed the VACNTs growth mechanism model,then estab-lished mapping relations between the VACNTs adhesion force and the different orientation degree,density,height.