Carbon Nanotubes Deposition Of Ceo <sub> 2 </ Sub> / Fe <sub> 2 </ Sub> O <sub> 3 </ Sub>

Since discovered in 1991 by Iijima, Carbon nanotube has attracted intensive attention as catalyst supporter due to its nano-diameter, large specific surface area, tubuler structure thant can be filled by nanoparticles, and high chemical stability. Nano-oxides such as cerium oxide and ferric oxide are important catalytic materials in catalyst industry. In this paper, Multiwall Carbon nanotube, cerium oxide and ferric oxide are chosen as experimental material, carbon nanotube supported cerium oxide and carbon nanotube supported ferric oxide are prepared in chemical deposition method. The deposition mechanism are also discussed here.In this paper, raw Multiwall carbon nanotubes are first purified and oxided by hydrochloric acid and blend acid composed of vitriol and nitric acid. High Resolution Transimission electron microscopy(HRTEM) and Infrared spectroscopy are employed to characterize the treated carbon nanotubes. The treatment is quite thorough, and impurities are fully eliminated. Tips of some Multiwall carbon nanotubes are opened , high-dense flaw and functional group are generated or introduced on the surface of Multiwall carbon nanotubes.Using cerium nitrate hexahydrate as raw material, ammonia hydroxide as precipitator, Multiwall carbon nanotubes supported cerium oxide nanoparticles were prepared by adding Multiwall carbon nanotubes into the solution as precipitation bearing matrix. High Resolution Transimission electron microscopy, X-ray diffraction and Infrared spectroscopy are employed to characterize the morphology, microstructure and component of cerium oxide supported on Multiwall carbon nanotubes. Considering the affect of agent's concentration, heat-treated temperature and other factors on deposition quality, we optimize the parameters and finally get dense, continuous coating of cerium oxide nanoparticles. Some cerium oxide nanoparticles even fill the internal channels of the carbon nanotubes.In this paper, the deposition mechanism of cerium oxide is dicussed. The process of cerium oxide deposition is considered to be a process of nucleation and growth. High-density flaw and functional groups generated by blend acid play a role as activated center for nucleation in the deposition process. High-resolution transmission electron microscopy evidenced several layers of spherical cerium oxide nanoparticles were...