钛酸钡纳米线的两步水热法制备及结构表征

Two-Step Hydrothermal Preparation and Structural Characterization of Barium Titanate Nanowires

采用两步水热法制备钛酸钡(BaTiO_(3))纳米线,研究了第一步水热反应中NaOH溶液浓度和反应时间对前驱体钛酸钠(Na_(2)Ti_(3)O_(7))纳米线相结构和微观形貌的影响,继而研究了第二步水热反应中反应时间和反应温度对BaTiO_(3)纳米线相结构和微观形貌的影响,同时探讨了纳米线的生长机理。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)及能谱仪(EDS)、透射电子显微镜(TEM)对前驱体和BaTiO_(3)纳米线进行了表征。结果表明,通过控制水热反应时间和反应温度可以制得线形结构良好、较大长径比的BaTiO_(3)纳米线。在钡钛摩尔比2:1,反应时间12 h,反应温度150℃的反应条件下可得到长度范围1.8;.8μm,直径范围125;75 nm,长径比范围4.8;8.4的BaTiO_(3)纳米线。

Barium titanate(BaTiO_(3))nanowires were prepared by a two-step hydrothermal method.The effects of NaOH solution concentration and reaction time in the first hydrothermal reaction on the phase structure and microscopic morphology of the precursor sodium titanate(Na_(2)Ti_(3)O_(7))nanowires were investigated,and then the effect of reaction time and reaction temperature on the phase structure and microscopic morphology of BaTiO_(3)nanowires were studied in the second hydrothermal reaction.The growth mechanism of nanowires was also discussed.The precursors and BaTiO_(3)nanowires were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM),energy dispersive spectroscopy(EDS)and transmission electron microscope(TEM).The results show that BaTiO_(3)nanowires with good linear structure and large aspect ratio can be prepared by controlling the hydrothermal reaction time and reaction temperature.When the molar ratio of Ba to Ti is 2:1,the reaction time is 12 h,and the reaction temperature is 150℃,BaTiO_(3)nanowires are obtained with lengths ranging from 1.8 to 4.8μm,diameters ranging from 125 to 375 nm,and aspect ratios ranging from4.8 to 38.4.