Comparison between ZnO nanorods grown via hydrothermal and electrochemical deposition techniques for transducer fabrication (original) (raw)
2020, Comparison between ZnO nanorods grown via hydrothermal and electrochemical deposition techniques for transducer fabrication
This paper presents the comparison between ZnO nanorod arrays grown using hydrothermal and electrochemical deposition techniques on a seedless ITO glass substrate. For electrochemical deposition, a two-electrode setup was used during the growth of the 1D ZnO nanorods in a zinc nitrate hexahydrate electrolyte. While an equimolar of zinc nitrate hexahydrate and hexamethylenetetramine (HMTA) dissolved in water was used for the hydrothermal technique. The study showed that the concentration of Zinc nitrate hexahydrate, temperature, and voltage had a huge effect on the growth rate and diameter of the nanorods. A high density of hexagonal ZnO nanorods were successfully grown along the c-axis over the entire seedless-ITO coated substrates in less than 1 hour using the electrochemical deposition technique. While the ZnO nanorods grown using the aqueous solution technique showed poor growth, crystallization and took at least 24 hours for growth time. Then the ZnO nanorods were studied and characterised using atomic force microscopy (AFM), scanning electron microscopy and X-ray diffraction (XRD). In this paper, the ZnO nanorods are used to manufacture a piezoelectric nanogenerator. Electrochemical deposition is by far the simplest growth technique to use, as it requires the lowest temperature and atmospheric pressure. Moreover, it is highly cost-effective and scalable than any other methods. Zinc oxide nanorods grown using the electrochemical deposition technique were observed to show better crystallization and piezoelectric properties than those grown via the aqueous solution technique. ZnO nanorods nanoscale devices hold a promising future for their application in photocatalysis, solar cells, optical and biosensing devices.
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