CNTs-ZAO复合粉体的制备及表征

摘要

以HCl溶液和H2SO4-HNO3的混合酸溶液作为纯化强酸溶液,采用强酸氧化法纯化碳纳米管(CNTs).将纯化后的CNTs加入到ZnO-Al2O3 (ZAO)前驱体溶液中,通过均匀沉淀法,制得CNTs-ZAO复合粉体.采用差示扫描量热仪(TG-DSC)、傅里叶红外光谱仪(FT-IR)、X线衍射仪(XRD)和扫描电子显微镜(SEM)表征纯化前后CNTs和CNTs-ZAO复合粉体.结果表明:在80℃、V(H2SO4)∶V(HNO3) =1∶1的条件下,水浴纯化反应2h,得到纯化效果较好的CNTs.在n(CNTs)∶n(ZAO)=4∶1、ZAO前驱体反应30 min之前加入纯化CNTs,CNTs的表面负载上一层均匀、致密的纳米ZAO颗粒.%Carbon nanotubes ( CNTs) were purified with the method of strong acid oxidation, including HCl, mixed acid solution of H2SO4 and HN03. Purified CNTs were added to precursor solution of ZnO-Al2O3(ZAO) , then CNTs-ZAO composite powders were obtained by homogeneous precipitation method. Purified CNTs and CNTs-ZAO composite powders were characteried by thermogravimetric differential scanning calorimetry ( TG-DSC ) , Fourier transform infrared spectrometer ( FT-IR) , X-ray diffraction (XRD) , and scanning electron microscopy ( SEM). Results showed that better-purified CNTs were obtained under the conditions of 80℃, V( H2SO4): V( HNO3) = 1: 1, and purification 2 h. Purified CNTs with ra(CNTs): n(ZAO) =4:1 and added ZAO precursor 30 min before reaction, CNTs-ZAO compound powders were acquired with a uniform layer of dense nano ZAO particles adsorption on the surface of CNTs.