Electrospinning preparation and photoluminescence properties of poly (methyl methacrylate)/Eu~(3+) ions composite nanofibers and nanoribbons

摘要

Nanofibers and nanoribbons of poly (methyl methacrylate) (PMMA)/Eu~(3+) ions composites with different concentration of Eu~(3+) ions were successfully prepared by using a simple electrospinning technique. From the results of scanning electron microscopy and energy-dispersive X-ray spectroscopy, we found that the morphology of the as-electrospun PMMA/Eu~(3+) ions composites could be changed from fiber to ribbon structure by adjusting the concentration of Eu~(3+) ions in the electrospun precursor solution. The coordination between the Eu~(3+) ions and PMMA molecules were investigated by Fourier transform infrared spectroscopy and differential thermal analysis. The photoluminescence (PL) properties of the as-electrospun PMMA/Eu~(3+) ions composites were studied in comparison to those of the Eu(NO_3)_3 powder. It was showed that the ~5D_0-~7F_J (J = 0,1, 2, 3,4) emission appeared in the PL spectra of the aselectrospun PMMA/Eu~(3+) ions composites, whereas the ~5D_0-~7F_0 emission was completely absent in the PL spectra of Eu(NO_3)_3 powder due to the different local environments surrounding Eu~(3+) ions. It was interesting to note that the intensity ratios of the electric-dipole and magnetic-dipole transitions for the PMMA/Eu~(3+) ions composites could be enhanced significantly by increasing electrospinning voltage.