Title: Investigation of electrochemical properties of platinum electrode chip for salinity measurement

Authors: Thang Minh Bui; Vi Nhat Hoang Ngo; Linh Duy Nguyen; Diep Ngoc Le; Tin Chanh Duc Doan; Chien Mau Dang

Addresses: Institute for Nanotechnology, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam ' Institute for Nanotechnology, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam; Vietnam National University Ho Chi Minh City, Community 6, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, 700000, Vietnam

Abstract: Determining the salinity of water through conductivity is a widely used method in scientific research, known for its advantages of quick response and high sensitivity, which has attracted significant attention from scientists. In this study, the 2-electrode and 4-electrode Pt chips were fabricated on the silicon substrate using the lithography process and sputtering magnetron DC. The electrode characteristics were investigated through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS). The 2-electrode system ensures stability in an environment with low electrical conductivity corresponding to salinity values ranging from 0.27‰ to 2.85‰, with an accuracy of ±0.22. The frequency is studied in the range of frequencies from 0.10 Hz to 1.0 MHz. The fabricated electrodes possess high accuracy characteristics, which is of significant importance for directly observing the physical parameters of river water environments.

Keywords: conductivity electrodes; salinity sensors; platinum chip; 2-electrode system; 4-electrode system.

DOI: 10.1504/IJNT.2024.146461

International Journal of Nanotechnology, 2024 Vol.21 No.7/8/9/10/11/12, pp.703 - 718

Published online: 30 May 2025 *

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