Abstract
Polyvinyl alcohol(PVA)/[La(NO3)3+Mn(CH3COO)2] composite nanofibers were fabricated by electrospinning, andpolycrystalline LaMnO3 nanofibers were prepared by calcination of the PVA/[La(NO3)3+Mn(CH3COO)2] compositenanofibers at 600ºC for 10h. The samples were characterized by using thermogravimetric-differential thermal analysis(TG-DTA), X-ray diffraction spectrometry(XRD), scanning electron microscopy(SEM) and Fourier transform infraredspectrometry(FTIR). The results show that PVA/[La(NO3)3+Mn(CH3COO)2] composite nanofibers are amorphous instructure, and pure phase LaMnO3 nanofibers are orthorhombic with space group Pbnm. The surface of as-preparedcomposite nanofibers is smooth, and the diameter is about 150nm. The diameter of LaMnO3 nanofibers is smaller thanthat of the relevant composite fibers. The surface of the LaMnO3 nanofibers becomes coarse with the increase ofcalcination temperatures. The diameter of LaMnO3 nanofibers is ca. 100nm, and the length is greater than 100????m. Themass of the sample remains constant when the temperature is above 450ºC, and the total mass loss percentage is 94.6%.Possible formation mechanism of LaMnO3 nanofibers is preliminarily proposed.
Highlights
The science and technology of nanostructured materials is advancing at a rapid pace (Yang, 2009, Gao, 2009, Mohapatra, 2008 & Zhang, 2007)
The results showed that the Polyvinyl alcohol (PVA)/[La(NO3)3+Mn(CH3COO)2] composite fibers were amorphous in structure, only a broad peak was located around 22o, it was the typical peak of the amorphous polymer, indicating that the composite fibers were amorphous in structure
The polycrystalline LaMnO3 nanofibers with single phase were synthesized when calcination temperature was in the range of 600-900oC, the d(spacing between crystallographic plane)values and relative intensities of LaMnO3 were consistent with those of JCPDS standard card(35-1353), and the crystal structure of the prepared LaMnO3 was orthorhombic system with space group Pbnm
Summary
The science and technology of nanostructured materials is advancing at a rapid pace (Yang, 2009, Gao, 2009, Mohapatra, 2008 & Zhang, 2007). One-dimensional nanostructured materials, such as nanowires, nanorods, nanowhiskers and nanofibers, have stimulated great interest due to their importance in basic scientific research and potential technological applications (Huynh, 2002 & Duan, 2003). They are expected to play an important role as both interconnects and functional components in the fabrication of nanoscale electronic and optoelectronic devices. Some inorganic compounds nanofibers have been prepared by electrospinning technique using electrospun fibers of polymer/inorganic composite as the precursor (Li, 2004, Zhang, 2008 & Shao, 2004). This processing involved the following three steps: (1) Preparation of a sol with
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