Formation mechanism and photoluminescence property of hollow porous In_2O_3 nanofibers

One-dimensional In2O3 nanofibers with hollow porous structure were prepared by electrospinning and thermal treatment.Thermogravimetry(TGA)was used to analyze the quality changes of precursor composite nanofibers during heat treatment process.X-ray diffractometry(XRD)was used to distinguish the crystal structures of products.The changes of functional groups of precursor composite nanofibers and In2O3 nanofibers were analyzed by Fourier transform infrared spectroscopy(FT-IR).The morphology and structure of the nanofibers were characterized by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Fianlly,the photoluminescence property of In2O3 was tested by fluorescence spectrophotometer.The experimental results showed that when In(NO3)3·4.5H2O/PVP=30%,the formation of precursor composite nanofibers was favorable,and the products under high calcination temperature still remained fibrous structure,but the diameters of fibers were obviously reduced.In2O3 nanoparticles existing in In2O3 nanofibers all had cubic bixbyite structure.The average particle size was about 27 nm.A strong green photoluminescence with peak at 505 nm was observed in the In2O3 nanofibers upon excitation at 250 nm at room temperature.