Title of article :
Optical properties of group-I-doped ZnO nanowires
Abdolhossein Sa?aedi، نويسنده , , Ramin Yousefi، نويسنده , , Farid Jamali Sheini، نويسنده , , Mohsen Cheraghizade، نويسنده , , A. Khorsand Zak، نويسنده , , Nay Ming Huang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Undoped and group-I elements doped ZnO nanowires were synthesized using a thermal evaporation method. Field emission scanning electron microscopy (FESEM) results showed that, the undoped ZnO nanowires were ultra-long with uniform diameters. On the other hand, the length of the doped ZnO nanowires was in the range of some hundred of nanometers. X-ray diffraction (XRD) patterns clearly indicated hexagonal structures for all of the products. X-ray photoelectron spectroscopy (XPS) studies confirmed the oxidation states of Li, Na, K, in the ZnO lattice. An asymmetric O 1s peak indicated the presence of oxygen in an oxide layer. The effect of doping on the optical band-gap and crystalline quality was also investigated using photoluminescence (PL), UV–vis, and Raman spectrometers. The Raman spectra of the products indicated a strong E2 (high) peak. The PL spectra exhibited a strong peak in the ultraviolet (UV) region of the electromagnetic spectrum for all of the ZnO nanowires. The UV peak of the doped ZnO nanowires was red-shifted compared to the undoped ZnO nanowires. In addition, the UV–vis spectra of the samples showed similar results compared to the PL results.
C. Optical properties , D. ZnO , A. Films
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