Synthesis and characterization of cu-doped ZnO nanorods

Pung, S.Y. and Ong, C.S. and Mohd Isha, K. and Othman, M.H. (2014) Synthesis and characterization of cu-doped ZnO nanorods. Sains Malaysiana, 43 (2). pp. 273-281. ISSN 0126-6039


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Cu-doped ZnO nanorods were synthesized by sol-gel method using zinc nitrate tetrahydrate, methenamine and cupric acetate monohydrate as precursors. The as-synthesized ZnO nanorods have a twin-rod structure. The polar (002) surface of ZnO nanorods, which could be either negatively charge (O-terminated) or positively charged (Zn-terminated), was responsible for the formation of twin-rod structure. The results showed that the size, aspect ratio, crystallinity and c-lattice parameter of Cu doped ZnO nanorods decreased with increasing of Cu dopant concentration. In fact, the presence of Cu retarded the growth of ZnO nanorods in its preferred growth direction, i.e. (0001). The XPS analysis indicates that Cu ions were oxidized (Cu2+) and substituted into the ZnO lattice at the Zn2+ site. The presence of Cu reduced the optical bandgap of ZnO from 3.34 eV (undoped ZnO nanorods) to 3.31 eV (20 mol% Cu doped ZnO). Besides, it induced a visible PL emission at 2.97 eV, which could be related to the transition of electrons from conduction band (Ec) to Cu acceptor energy level (Ev + 0.45 eV) radiatively.

Item Type:Article
Keywords:Copper; in-situ doping; semiconductor; sol-gel processes; ZnO nanorods
Journal:Sains Malaysiana
ID Code:6858
Deposited By: ms aida -
Deposited On:11 Feb 2014 07:00
Last Modified:14 Dec 2016 06:42

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