Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia.
Nanotechnology. 2011 Jun 10;22(23):235702. doi: 10.1088/0957-4484/22/23/235702. Epub 2011 Apr 11.
We report the fabrication of novel multiferroic nanostructured bismuth ferrite (BiFeO(3)) fibers using the sol-gel based electrospinning technique. Phase pure BiFeO(3) fibers were prepared by thermally annealing the electrospun BiFeO(3)/polyvinylpyrrolidone composite fibers in air for 1 h at 600 °C. The x-ray diffraction pattern of the fibers (BiFeO(3)) obtained showed that their crystalline structures were rhombohedral perovskite structures. Both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images revealed that the BiFeO(3) fibers were composed of fine grained microstructures. The grains were self-assembled and self-organized to yield dense and continuous fibrous structures. The magnetic hysteresis loops of these nanostructured fibers displayed the expected ferromagnetic behavior, whereby a coercivity of ∼ 250 Oe and a saturation magnetization of ∼ 1.34 emu g(-1) were obtained. The ferroelectricity and ferroelectric domain structures of the fibers were confirmed using piezoresponse force microscopy (PFM). The piezoelectric hysteresis loops and polar domain switching behavior of the fibers were examined. Such multiferroic fibers are significant for electroactive applications and nano-scale devices.
我们使用基于溶胶-凝胶的静电纺丝技术制备了新型多铁纳米结构的铁酸铋（BiFeO(3)）纤维。通过将静电纺丝的 BiFeO(3)/聚乙烯吡咯烷酮复合纤维在空气中 600°C 下退火 1 小时，制备出相纯的 BiFeO(3)纤维。纤维（BiFeO(3)）的 X 射线衍射图谱表明其晶体结构为菱面体钙钛矿结构。扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像均显示，BiFeO(3)纤维由细晶粒微观结构组成。这些晶粒自组装和自组织形成致密连续的纤维结构。这些纳米结构纤维的磁滞回线显示出预期的铁磁性行为，得到约 250 Oe 的矫顽力和约 1.34 emu g(-1)的饱和磁化强度。使用压电力显微镜（PFM）证实了纤维的铁电性和铁电畴结构。研究了纤维的压电滞后回线和极域开关行为。这种多铁纤维对于电活性应用和纳米级器件具有重要意义。
