在卵磷脂体系中合成EuF_3纳米线

利用大豆卵磷脂在水中自发形成的囊泡作模板,先制备出含有Eu~(3+)的卵磷脂乳液,Eu~(3+)与卵磷脂亲水头部的磷氧键相结合形成Eu--O--P键,经用NH_4F沉淀后制得前驱体,该前驱体在600℃灼烧,得到EuF_3纳米线,其直径约为10-20 nm.通过对各阶段产物的荧光光谱、傅里叶变换红外(FTIR)光谱、热重-差热分析(TG-DTA)、透射电镜(TEM)等的对比分析,确认形成了Eu--O--P键,所得到的纳米线是多晶相EuF_3.

Synthesis of EuF_3 Nanowires in Soybean Lecithin

The precursor was prepared in two steps: the soybean lecithin latex containing Eu~(3+) ions was prepared first using a EuC1_3 solution. The vesicles formed spontaneously in the soybean lecithin aqueous solution and were used as a template. The precursor was then obtained by precipitating Eu~(3+) ions with NH_4F in the vesicle system that was formed by soybean lecithin. EuF_3 nanowires with diameters of about 10-20 nm were obtained from the precursor that was annealed at 600 ℃. The formation of the EuF_3 nanowires is discussed considering a comparative analysis by fluorescence spectra, Fourier transform infrared (FTIR) spectra, thermal gravimetric analysis-differential thermal analysis (TGA-DTA), and transmission electron microscopy (TEM) of the products from each stage. Results show that the Eu-O-P bond is formed by the coordination of Eu~(3+) ions and the nanowires are multi-crystalline phase EuF_3.