Lead-free Na_(0.5)Bi_(0.5)TiO_3(NBT) nanofibers with the perovskite structure were prepared by the electrospinning method.The nanofibers were about 200-300 nm in diameter and up to several hundred microns in length.The crystal structures and morphologies of the nanofibers were characterized by X-ray diffraction(XRD),Raman spectroscopy,scanning electron microscopy(SEM),and transmission electron microscopy(TEM).The effective piezoelectric property of individual NBT nanofiber was examined by piezoresponse force microscopy(PFM).The NBT nanofibers crystallized in pure perovskite phase after annealing above 700℃in air and comprised a great number of fine particles with size of 60-80 nm.In addition,the electromechanical energy conversion models for NBT nanofibers were built and demonstrated high voltage output as high as several millivolts.Such a result qualifies NBT nanofibers as a promising candidate for leadfree electromechanical conversion devices.
Di ZhouYouhua ZhouYu TianYafang TuGuang ZhengHaoshuang Gu
SnO_2 nanotube arrays have been synthesized by means of a simple and low-cost method.The ZnO nanorod arrays prepared by aqueous chemical growth method were used as templates.By liquid phase deposition,SnO_2 nanotubes were obtained with proper deposition time.Scanning electron microscopy,transmission electron microscopy and X-ray diffraction were used to characterize the morphologies and structures of the products,and the formation mechanism was discussed according to the experimental results.
Yafang TuQiuming FuXiaojuan NiuJianping SangZhijie TanXianwu Zou
