静电纺丝技术制备钇铝石榴石纳米纤维

FABRICATION OF YTTRIUM ALUMINUM GARNET NANOFIBERS BY AN ELECTROSPINNING TECHNIQUE

采用静电纺丝技术制备了聚乙烯吡咯烷酮(polyvinylpyrrolidone,PVP)/[Y(NO3)3+Al(NO3)3]复合纳米纤维,将复合纤维进行焙烧,得到了钇铝石榴石(yttrium aluminium garnet,YAG)纳米纤维。用X射线衍射、扫描电子显微镜、热重-差热分析、Fourier变换红外光谱对PVP/[Y(NO3)3+Al(NO3)3]和YAG纤维样品进行了分析。结果表明:PVP/[Y(NO3)3+Al(NO3)3]复合纳米纤维为非晶态,经900℃焙烧10h后,获得了单相石榴石型的YAG立方晶系纳米纤维,空间群为Ia3d。所制备的PVP/[Y(NO3)3+Al(NO3)3]复合纤维表面光滑,平均直径约175nm;YAG纳米纤维平均直径约75nm,长度大于100μm。复合纤维在温度高于550℃时,质量保持恒定,总质量损失率为90.4%。初步讨论了YAG纳米纤维的形成机理。

Polyvinylpyrrolidone （PVP）/[Y（NO3）3＋Al（NO3）3] composite fiber was prepared by electrospinning. Yttrium aluminum garnet （YAG） nanofibers were fabricated by calcination of the relevant composite nanofibers. PVP/[Y（NO3）3＋Al（NO3）3] composite nanofibers and YAG nanofibers were analyzed by using X-ray diffraction spectrometry, scanning electron microscopy, thermogravimetric-differential thermal analysis and Fourier transform infrared spectrometry. The results show that PVP/[Y（NO3）3＋Al（NO3）3] composite nanofiber is amorphous in structure, and pure phase YAG nanofibers are obtained by calcination of the PVP/[Y（NO3）3＋ Al（NO3）3] composite fibers at 900 ℃ for 10 h. The surface of as-prepared composite fibers is smooth, and the diameter of the composite fibers is about 175 nm. The diameter of the prepared YAG nanofibers is about 75 nm, and the length is greater than 100 lam. The mass of the sample remains constant when the temperature is above 550 ℃, and the total mass loss percentage is 90.4%. The possible formation mechanism of the YAG nanofibers was preliminarily discussed.