Synthesis of ZnO Complex Structures at Different Molar Ratio of Zn (NO₃)₂ and KOH by Precipitation Method

Abstract:

ZnO as a semiconductor with wide direct band gap (3.37 eV) and high exciton binding energy of 60 meV. It has attracted in several applications such as solar cells, field emission, sensor, etc. In this study, different ZnO complex structures were prepared by precipitation method at different molar ratio. Zinc nitrate as zinc source, potassium hydroxide as precipitating agent and sodium dodecly sulphate as surfactant were used to synthesis the ZnO. The effect of different molar ratio on the morphology and size of final product have been investigated. The final products were characterized by X-ray diffraction (XRD) with Cu Kα radiation, field emission scanning electron microscopy (FESEM) with an attached energy dispersive x-ray spectroscopy (EDS) and photoluminescence spectrofluorophotometer (PL). From XRD patterns, all synthesized ZnO shows good crystallinity. Different morphologies of synthesized ZnO were obtained from FESEM including flower composed flakes, flower composed radial rods and single straight rods while the EDS result demonstrates elements Zn and O obtained in the product. A very strong UV emission at ~390 nm observed in PL spectra indicated that the ZnO are of high crystal quality.

• Periodical: Advanced Materials Research (Volume 576)
• Pages: 330-333
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.576.330
• Online since: October 2012
• Authors: N.Y. Zayana, M. Rusop
• Keywords: Molar Ratio, Morpholoy, Optical, Precipitation, Zinc Oxide (ZnO)

References

[1] K. Hara, T. Horiguchi, T. Kinoshita, K. Sayama, H. Susihara, H. Arakawa, Highly efficient photon-to-electron conversion with mercurochrome-sensitized nanoporous oxide semiconductor solar cells, Sol. Energy Mater. Sol. Cells 64 (2000) 115.

DOI: 10.1016/s0927-0248(00)00065-9

[2] C. Liu, J. A. Zapien, Y. Yao, X. Meng, C. S. Lee, S. Fan, Y. Lifshitz, S.T. Lee, High-density, ordered ultraviolet light-emitting ZnO nanowire arrays, Adv. Mater. 15 (2003) 838.

DOI: 10.1002/adma.200304430

[3] M.H. Huang, S. Mao, H. Feick, H. Yan, Y. Wu, H. Kind, E. Weber, R. Russo, P. Yang, Room-temperature ultraviolet nanowire nanolasers, Science 292 (2001) 1897.

DOI: 10.1126/science.1060367

[4] J. A. Rodriguez, T. Jirsak, J. Dvorak, S. Sambasivan, D. Fischer, Reaction of NO2 with Zn and ZnO: Photoemission, xanes, and density functional studies on the formation of NO3, J. Phys. Chem. B. 104 (2000) 319.

DOI: 10.1002/chin.200018020

[5] S. Y. Li, C. Y. Lee, T. Y. Tseng, Copper-catalyzed ZnO nanowires on silicon (100) grown by vapor-liquid-solid process, J. Cryst. Growth 247 (2003) 357-362.

DOI: 10.1016/s0022-0248(02)01918-8

[6] Y. Sun, G. M. Fuge, M. N. R. Ashfold, Growth of aligned ZnO nanorod arrays by catalyst-free pulsed laser deposition methods, Chem. Phys. Lett. 396 (2004) 21.

DOI: 10.1016/j.cplett.2004.07.110

[7] G. R. Li, X. H. Lu, D. I. Qu, C. Z. Yao, F. I. Zheng, Q. Bu, C. R. Dawa, Y. X. Tong, Electrochemical growth and control of ZnO dendritic structures, J. Phys. Chem. C. 111 (2007) 6678.

DOI: 10.1021/jp068401+

[8] Z. L. Wang, Zinc oxide nanostructures: growth, properties and applications, J. Phys. Condens. Mater. 16 (2004) 829.

[9] G. Sun, M. Cao, Y. Wang, C. Hu, Y. Liu, L. Ren, Z. Pu, Anionic surfactant-assisted hydrothermal synthesis of high-aspect ratio ZnO nanowires and their photoluminescence property, Mater. Lett. 60 (2006) 2777-2782.

DOI: 10.1016/j.matlet.2006.01.088

[10] D. M. Bangall, Y. G. Chen, Z. Zhu, T. Yao, Optically pumped lasing of ZnO at room temperature, Appl. Phys. Lett. 70 (1997) 2230.

DOI: 10.1063/1.118824