Sol-Gel Synthesis of Strontium Titanate Nanofibers by Electrospinning

摘要

The preparation of homogeneous SrTiO3 nanofibers has been difficult and there are few publications in this field. In this research, consistent structures of strontium titanate ceramic fibers were obtained using an easy sol-gel and electrospinning methodology, giving an alternative for preparing ceramics in the form of fibrillar membranes. Two sol-gel solutions starting from Strontium nitrate and titanium tetraisopropoxyde were prepared and then mixed and homogenized with polyvinylpyrrolidone polymeric solution. The green fibers obtained from the ceramic precursors had a diameter of 140 to 180 nm. At 1000 degrees C the shape of fibers was preserved, with mean diameter of 103 +/- 39 nm. Based on the thermal analysis, the phase transition from tetragonal titanium oxide to the perovskite structure of strontium titanate was determined to take place at 800 degrees C. By infrared spectroscopy, Raman spectroscopy and X-ray diffraction analysis, it was determined that ceramic fibers at 1200 degrees C had a perovskite structure characteristic of strontium titanate.