Preparation Of Carbon Nanotube Arrays And Its Application Research

In this paper,using xylene as carbon source and ferrocene as catalyst,centripetal CNT arrays were prepared via chemical vapor deposition(CVD) on concave spherical surface with spherical radius of 0. 5 mm, 1 mm and 1.5 mm in quartz substrate. The structure of samples was analyzed through scanning electron microscope(SEM), transmission electron microscopy(TEM), Raman spectroscopy(Raman), etc. The results show that with the decrease of radius of curvature, the directionality of centripetal CNT arrays gets better. The centripetal CNT arrays with curvature radius of 0.5 mm has the best centripetal directionality, straightness and highest purity.In addition,analyzing the effect of oxidation by CO2 on the structure and performance of CNT arrays through scanning electron microscope(SEM), Raman spectroscopy(Raman) and XRD.The results indicate that, with the increase of oxidating time, the wall of the carbon nanotube in CNT arrays become thinner and the diameter becomes smaller. Meanwhile, the content of iron increases, which enhances the magnetic property of CNT arrays.Finally, A carbon aerogels doped carbon nanotubes(CA/CNT) electrode for supercapacitor was prepared and its performances were evaluated using N2 absorption, scan electron microscope, cyclic voltammetry and frequency response measurements. CA/CNT has porous structure and larger specific surface area than CA. CA/CNT showed superior capacitive behavior,power output and high-frequency performance in EDLCs due to its porous structure and large specific surface area. Capacitance of CA/CNT electrode can reach over 80 F/g with high Specific surface area BET at a high sweep rate of 50 m V/s, while that of CA electrode is only 60F/g at the same sweep rate. In addition, CA/CNT material can provide much higher power densities and still maintain high energy density. Thus, it can be anticipated that CA/CNT is a promising electrode material for super capacitor.