Nanofibers of barium strontium titanate (BST)by sol-gel processing and electrospinning

摘要

This paper describes the fabrication of barium strontium titanate (Ba_(0.6)Sr_(0.4)TiO_3 or BST)nanofibers by electrospinning method using a solution that contained poly(vinylpyrrolidone)and a sol-gel solution of BST.The as-spun and calcined BST/PVP composite nanofibers were characterized by TG-DTA,X-ray diffraction,FT-IR,SEM and TEM,respectively.After calcination of the as-spun BST/PVP composite nanofibers at above 700 deg C in air for 2 h,BST nanofibers of 188 +-25 nm in diameter having well-developed cubic-perovskite structure were successfully obtained.The crystal structure and morphology of the nanofibers were influenced by the calcination temperature.Calcination at below 700 deg C resulted in amorphous phase whereas BST with second phase such as barium titanate were formed at above 700 deg C.Diameters of the nanofibers decreased from 208 +-35 to 161 +-18 nm with increasing calcination temperature between 600 and 800 deg C.