Structure, X-ray photoelectron spectroscopy and photoluminescence properties of highly ordered ZnO microrods

✍ Scribed by Xiao-Jie Yang; Xin-Yu Miao; Xiao-Liang Xu; Chuan-Ming Xu; Jun Xu; Hong-Tu Liu

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 287 KB
• Volume: 27
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2004.05.007

✦ Synopsis

ZnO microrods were grown by aqueous bath synthesis at 90 °C and annealed at 400 °C in air. Both scanning electron micrographs and X-ray diffraction patterns indicate that the ZnO microrods are wurtzite crystallographic phase with metastable (0 0 2) preferred orientation. X-ray photoelectron spectroscopy spectra show that Zn 2p and O 1s spectra mainly originate from the Zn 2+ and O 2À ions in Zn-O bonds, respectively. Photoluminescence spectra of ZnO microrods are dominated by outstanding ultraviolet (UV) emission bands, which are attributed to the first, the second or the third longitudinal optical phonon replicas of free-exciton (E FX ) emission. The degeneration of (0 0 2) crystalline planes causes the intensity decline and the redshift of UV emission peaks in the ZnO microrods.