The vibrational properties of one-dimensional ZnO:Ce nanostructures

Different morphological one-dimensional ZnO:Ce nanostructures were synthesized on a large scale. The microstructures and vibrational properties were investigated by x-ray diffraction, electron microscopy, Raman spectroscopy, and infrared spectroscopy. The results show that Ce can effectively control the growth of ZnO nanostructures. The change of the morphology and local structure of ZnO under the influence of Ce results in the variation of vibrational properties. In Raman spectra of doped samples, some classical modes, such as A(1) and E-1 modes, disappear, and two anomalous modes at 527 and 667 cm(-1) are observed, whose intensity decreases with the increase of synthesis temperature. In infrared spectra, some surface phonon modes appear. Compared with those of the undoped sample, all the normal modes observed in the Ce-doped samples blueshift, and the extent of the blueshift decreases with increasing synthesis temperature in the Raman and infrared spectra. (C) 2004 American Institute of Physics.