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ISRN Nanomaterials
Volume 2012 (2012), Article ID 651468, 7 pages
Research Article

Growth of ZnO Nanorod Arrays on Flexible Substrates: Effect of Precursor Solution Concentration

1Physics Department, Auburn University, Auburn, AL 36849, USA
2Materials Research and Education Center, Department of Mechanical Engineering, Auburn University, Auburn, AL 36849, USA
3Department of Eco and Functional Materials, Korea Institute of Industrial Technology, Cheonan, Choongnam 331-825, Republic of Korea

Received 7 May 2012; Accepted 11 June 2012

Academic Editors: A. Bendavid, P. Kumbhakar, A. Portavoce, A. Sorrentino, and C. Wang

Copyright © 2012 Fei Tong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We report a low-temperature aqueous solution growth of uniformly aligned ZnO nanorod arrays on flexible substrates. The substrate is Indium Tin Oxide (ITO) film coated on polyethylene terephthalate (PET). Solutions with five different concentrations of the precursors with equimolar Zinc Nitrate and Hexamethylenetetramine (HMT) in distilled water were prepared to systematically study the effect of precursor solution concentration on the structural and optical properties of ZnO nanorods. It was concluded that the precursor concentration have great influence on the morphology, crystal quality, and optical property of ZnO nanorods. The diameter, density, and orientation of the nanorods are dependent on the precursor solution concentration. X-ray diffraction and micro-Raman spectroscopy showed that the ZnO nanorods with the highest concentration of 50 mM were highly aligned and have the highest level of surface coverage. It was also found that the diameter and length of the nanorods increases upon increasing precursor solution concentration. This is the first systematic investigation of studying the effect of precursor solution concentration on the quality of ZnO nanorods grown on ITO/PET substrates by low-temperature solution method. We believe that our work will contribute to the realization of flexible organic-inorganic hybrid solar cell based on ZnO nanorods and conjugated polymer.