ZnO nanostructured arrays: controlling the rod/plate shape
Paper ID : 1451-ICNS
Authors:
Faeze Ashtari-Mahini1, Hosein Abdizadeh2, Mohammad Reza Golobostanfard *3
1School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
2University of Tehran
3University of tehran
Abstract:
Zinc oxide is known as one of the most promising nanostructures. In this paper, a low-temperature hydrothermal method is utilized to prepare one dimensional ZnO nanorods and two dimensional nanoplates. The hydrothermal solution was prepared by dissolving 0.1 or 0.2 M zinc nitrate (ZNH) and hexamethylenetetramine (HMTA) in deionized water, which then subjected to hydrothermal treatment of pre-seeded substrates at 90 °C for 240 min. The structure and morphology of the samples is characterized by means of X-ray diffraction and field emission scanning electron spectroscopy. Both films demonstrate highly preferential growth, while the growth along (002) in case of nanoplates is extremely higher. It is shown that by increasing the concentration from 0.1 to 0.2 M, the morphology changes from nanorods to nanoplates. By increasing precursor molarity, the concentration of OH- ion also increases. When the concentration of OH- ion is low, nanorods grow fast along c-axis direction due to high energy of polar (001) surfaces. In higher OH- ion concentrations, more OH- ion preferentially are adsorbed on the (001) surface of ZnO and the growth of the ZnO nanocrystallite along the c-axis is suppressed and finally ZnO nanoplates are formed.
Keywords:
Hydrothermal, ZnO shape, Nanorod, Nanoplate, Concentration.
Status : Abstract Accepted (Poster Presentation)