Cost-Effective Method for Dissolved Oxygen Sensing with Electrodeposited n-Cu<sub>2</sub>O Thin-Film Semiconductors

Cost-Effective Method for Dissolved Oxygen Sensing with Electrodeposited n-Cu<sub>2</sub>O Thin-Film Semiconductors

Dissolved oxygen (DO) is a crucial parameter in water quality monitoring because it directly affects the health of aquatic ecosystems. This study explored electrodeposited Cu<sub>2</sub>O thin-film semiconductors for DO sensing. Cu<sub>2</sub>O was chosen for its low cost, ec...

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Main Authors: H. E. Wijesooriya, J. A. Seneviratne, K. M. D. C. Jayathilaka, W. T. R. S. Fernando, P. L. A. K. Piyumal, A. L. A. K. Ranaweera, S. R. D. Kalingamudali, L. S. R. Kumara, O. Seo, O. Sakata, R. P. Wijesundera
Format: Article
Language:English
Published: MDPI AG 2025-02-01
Series:Physchem
Subjects:
Cu<sub>2</sub>O
dissolved oxygen
electrodeposition
bath pH
surface morphology
Online Access:https://www.mdpi.com/2673-7167/5/1/6
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Summary:Dissolved oxygen (DO) is a crucial parameter in water quality monitoring because it directly affects the health of aquatic ecosystems. This study explored electrodeposited Cu<sub>2</sub>O thin-film semiconductors for DO sensing. Cu<sub>2</sub>O was chosen for its low cost, eco-friendliness, and non-toxic nature. Cu<sub>2</sub>O films were electrodeposited on titanium (Ti) substrates using an acetate bath (0.1 M sodium acetate and 0.01 M cupric acetate) at −200 mV versus Ag/AgCl for 30 min, with a bath temperature of 55 °C, stirred at 50 rpm. The bath pH was systematically adjusted from 5.8 to 6.8 in 0.2 steps using NaOH and Acetic acid. A range of analyses including synchrotron X-ray diffraction (SXRD), scanning electron microscopy (SEM), surface wettability, capacitance–voltage (C-V), Raman spectroscopy, Fourier-transform infrared (FTIR) spectrum, and Electrochemical Impedance Spectroscopy (EIS) was performed to assess their properties and sensing performance. The results showed that Cu<sub>2</sub>O films deposited at pH 6.4 exhibited optimal performance for DO sensing, with a strong linear response, marking this pH, deposition time, and temperature as ideal for creating effective DO sensors. This study introduces a novel, cost-effective approach to dissolved oxygen sensing using electrodeposited n-Cu<sub>2</sub>O thin-film semiconductors, marking the first application of this material in such sensors and showcasing its potential for scalable and environmentally sustainable sensing technologies.
ISSN:2673-7167

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