La_0.5Sr_0.5CoO_3-δ导电陶瓷纤维的静电纺丝法制备及表征

Fabrication and Characterization of La_0.5Sr_0.5CoO_3-δ Fibers by Electrospinning

摘要: 以金属硝酸盐为原料，柠檬酸和乙二醇为复合络合剂，聚乙烯毗咯烷酮(PVP)为纤维成型剂，采用改进的静电纺丝法制备了La_0.5Sr_0.5CoO_3-δ (LSCO)纤维前驱体，经热处理后得到LSCO亚微米纤维。考察了纤维成型剂PVP的分子量、添加量，纺丝液金属离子浓度，前驱体热处理温度对静电纺丝过程和物相结构的影响，采用X射线衍射仪、扫描电镜及EDS能谱面扫表征了载银LSCO纤维的物相结构、形貌和元素分布。结果表明：采用平均分子量为1,300,000的PVP配置纺丝成型剂，前驱体纺丝液中PVP的加入量为3.5 wt%，金属离子浓度为0.125 mol/L时，纺丝效率最高，能达到9 ml/h。获得的LSCO前驱体纤维在800℃热处理下能够获得直径为0.5~2 μm的LSCO陶瓷纤维。

Abstract: Using metal nitrates, citric acid, ethylene glycol and polyethylene pyrrole (PVP) as precursors, La_0.5Sr_0.5CoO_3-δ (XRD) fibers were fabricated via sol-gel method, electrospinning and subsequent heating process. The thermal decomposition process, crystal structure, morphology and element distribution of the as-pun and as-calcined fibers were studied by means of thermogravimet-ric-dlifferential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. The results show that: the optimum preparation conditions are that the spinning forming agent is prepared by 3.5 wt% PVP with the average molecular weight of 1,300,000, and the concentration of metal ions is 0.125 mol/L. The spinning speed can reach up to 9 ml/h under these conditions. After annealing the LSCO precursor fiber at 800˚C, LSCO ceramic fibers with diameters ranged from 0.5 μm to 2 μm were successfully obtained.