Investigation of the pH effect in hydrothermal growth of zinc oxide nanostructures

Zulkifli, Nor Ashikin and Hasbullah, Nurul Eddahanie and Ameruddin, Amira Saryati and Awang, Noor Azura and Ahmad, Mohd. Khairul (2020) Investigation of the pH effect in hydrothermal growth of zinc oxide nanostructures. Journal of advance research in dynamical & control systems, 12 (2). pp. 804-808.

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This study focuses on the influence of the pH value of hydrothermal solution on the morphology and the transmission spectrum of zinc oxide (ZnO) nanostructures using field-emission scanning electron microscope (FE-SEM) and ultraviolet-visible (UV-Vis) spectroscopy, respectively. The ZnO nanostructures were grown on glass substrates at 90oC for 5 hours. The pH and the concentration of the starting solutions were varied from 2.03 to 12.02 and 6 mM to 100 mM respectively. Various ZnO structures of neuron-like, flowerlike, and urchin-like morphologies were obtained at alkaline pH (~8.00 to ~9.00) while for pH solution lower than ~8.00, rod-like nanostructures were obtained. Solution of pH value <4.6 and >11.50 shows that growth of nanostructures was suppressed due to the high susceptibility to erosion in both acidic and alkaline solutions. By changing the concentrations of the solution, the density and size were also varied. The increase in concentration lead to the increase of nanostructure density and the diameter of ZnO nanorods. The trend shows that the concentration solution from lower (C < 6mM) to a higher concentration (C > 100mM) resulted ZnO nanostructures such as nanorods to thick film due to overgrowth and coalescence of the nanostructures with more available precursors.

Item Type: Article
Uncontrolled Keywords: Hyrothretmal, morphology, nanorods, pH variation, ZnO
Subjects: T Technology > TP Chemical technology > TP155-156 Chemical engineering
Divisions: Faculty of Applied Science and Technology > Department of Physics and Chemistry
Depositing User: Mr. Abdul Rahim Mat Radzuan
Date Deposited: 17 Oct 2021 07:25
Last Modified: 17 Oct 2021 07:25

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