PERFORMANCE OF pH SENSOR ELECTRODE BASED ON ZnO NRs ON FTO-GLASS SUBSTRATE

Abdulqader D. Faisal, Mohammad O. Dawood (), Hassan H. Hussein () and Khaleel I. Hassoon ()
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Abdulqader D. Faisal: Department of Applied Science, University of Technology, Baghdad, Iraq
Mohammad O. Dawood: #x2020;Department of Physics, University of Mustansiriyah, Baghdad, Iraq
Hassan H. Hussein: Department of Applied Science, University of Technology, Baghdad, Iraq
Khaleel I. Hassoon: Department of Applied Science, University of Technology, Baghdad, Iraq

Surface Review and Letters (SRL), 2020, vol. 27, issue 08, 1-7

Abstract: In this work, ZnO nanorods (ZnO NRs) were successfully synthesized on FTO-glass via hydrothermal technique. Two steps were followed to grow ZnO NRs. In the first step, the seed layer of ZnO nanocrystals was deposited by using a drop cast method. The second step was represented by the hydrothermal growth of ZnO NRs on a pre-coated FTO- glass with the seed layer. The hydrothermal growth was conducted at 90∘C for 2h. The resulted structure, morphology and optical properties of the produced layers were analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray (EDX) and UV-visible spectrophotometer, respectively. The analysis confirmed that the ZnO NRs grown by the hydrothermal method have a hexagonal crystal structure which was grown randomly on the FTO surface. The crystallite size was recorded 50nm and a slight microstrain (0.142%) was calculated. The bandgap was found to be in the range of 3.14–3.17eV. The ZnO NRs have a high density and large aspect ratio. A pH sensor with high sensitivity was fabricated using a two-electrode cell configuration. The ZnO NRs sensor showed the sensitivity of −59.03mV/pH, which is quite promising and close to the theoretical value (−59.12mV/pH).

Keywords: Hydrothermal; ZnO seed layer; ZnO nanorods; pH sensor (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501981

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