The Modification And Depositing Of Carbon Nanotubes And Molybdenum Disulfide Powders

Since the discovery of carbon nanotubes （CNTs）, it has attracted extensiveattention and research due to their unique quasi one-dimensional structure andspecial physical chemical and mechanical properties. Subsequently molybdenumdisulfide （MoS₂）, which has the analogous layered structure, has been reported byTenne et al. Both of them have widely applied in high-strength materials, electronicwire, hydrogen storage and electrode materials. It is notable that CNTs are easy toagglomerate because of its large aspect ratio and length with small diameter. Meanwhile theMoS₂powders have large aspect ratio and bad wettability, so solving the problems indispersion and interfacial adhesion is more important in bringing out their advantages.In the experiment we treated the multiwalled carbon nanotubes （MWCNTs） andMoS₂with oxidation and surfactant modification respectively. Through changing theoxidated temperature, time, surfactant variety and modificated mode, we obtained the betterwetting and active surface materials which were verified by the microscope. The MWCNTswere pretreated by immersing in the boiling sulfuric acid （H2SO4） and nitric acid （HNO3）（volume ratio is3:1） solution. The results showed that the oxidated time last, the MWCNTswere shorted, uncapped and actived due to the surface group. The MoS₂powders weretreated by different surfactants and different modified method with polyethyleneglycol（PEG）, Polyvinyl Alcohol （PVA）, polyacrylic acid （PAA） and sodium dodecyl benzenesulfonate （SDBS）. The results showed that under the compound modification as PEG andPEG, PEG and SDBS and PAA and SDBS, the MoS₂powders dispersed well.We successfully synthesized the MoS₂/MWCNTs coaxial nanotubes and Ag/MoS₂coating powders using the thermal decomposition method. The morphology, structure,qualitative and quantitative analysis of the coating materials were investigated via themeans of （HR）TEM, XPS, XRD, Raman, FTIR and （FE）SEM. Finally we achieved theoptimum modification technology and calcined parameters. In a certain range of time andconcentration, the thickness of MoS₂on CNTs surface increased as time went and thecoatings became uniform and continuous as concentration increased. Under the differentsurfactants and modified methods, the Ag/MoS₂coating powders had different uniformityand compactness. The crystallinity of coating materials was proportional to the calcinationtemperature. The higher the temperature was, the better the crystallinity had. But it was themost important to consider all the factors to determine the best calcination process.