同轴静电纺丝技术制备Y_2O_3:Eu~(3+)@SiO_2豆角状纳米电缆与表征

采用同轴静电纺丝技术,以氧化钇、氧化铕、正硅酸乙酯(C8H20O4Si)、无水乙醇、PVP和DMF为原料,成功制备出大量的Y2O3:Eu3+@SiO2豆角状纳米电缆.用TG-DTA,XRD,SEM,TEM和荧光光谱等分析技术对样品进行了系统地表征.结果表明,得到的产物为Y2O3:Eu3+@SiO2豆角状纳米电缆,以无定型SiO2为壳层,晶态Y2O3:Eu3+球为芯,电缆直径约为200nm,内部球平均直径约150nm,壳层厚度约为25nm,电缆长度300μm.纳米电缆内部为球状结构,沿着纤维长度方向有序排列,形貌均一.Y2O3:Eu3+@SiO2豆角状纳米电缆在246nm紫外光激发下,发射出Eu3+离子特征的波长为614nm的明亮红光.对其形成机理进行了初步讨论.

Preparation of Y_2O_3:Eu~(3+)@SiO_2 Yard-long-bean-structured Nanocables by Coaxial Electrospinning and Their Characterization

Highly-yielded Y_2O_3:Eu~(3+)@SiO_2 yard-long-bean-structured nanocables have been successfully synthesized by a coaxial electrospinning technique using Y_2O_3, Eu_2O_3, C_8H_(20)O_4Si, absolute ethanol, PVP and DMF as the starting materials, and characterized by thermogravimetry and differential thermal analysis (TG-DTA), X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and fluorescence spectroscopy techniques. The as-prepared nanocables with a mean diameter of 200 nm had a crystalline spherical-like Y_2O_3:Eu~(3+) core of an average diameter of 150 nm and an amorphous SiO_2 shell of 25 nm in thickness. The length of the nanocables was longer than 300 μm. Spherical-like Y_2O_3:Eu~(3+) particles with uniform morphology formed of the core of the nanocables were orderly arranged along with the length direction of the nanocables. The nanocables emitted bright red light of 614 nm in wavelength of Eu~(3+)characteristic emission under the excitation of 246 nm ultraviolet ray. The formation mechanism of these nanocables was preliminarily discussed.