Optical properties of group-I-doped ZnO nanowires |
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| Authors: | Abdolhossein Sa?aedi Ramin Yousefi Farid Jamali-Sheini Mohsen Cheraghizade A Khorsand Zak Nay Ming Huang |
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| Affiliation: | 1. Department of Electrical Engineering, Bushehr Branch, Islamic Azad University (I.A.U), Bushehr, Iran;2. Depertment of Physics, Masjed-Soleiman Branch, Islamic Azad University (I.A.U), Masjed-Soleiman, Iran;3. Department of Physics, Ahwaz Branch, Islamic Azad University, Ahwaz, Iran;4. Nanotechnology Laboratory, Esfarayen University, North Khorasan, Iran;5. Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | 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. |
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| Keywords: | A Films C Optical properties D ZnO |
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