Iridium Oxide pH Sensor Based on Stainless Steel Wire for pH Mapping on Metal Surface

A simple technique to fabricate the iridium oxide pH sensor is useful in several applications such as medical, food processing and engineering material where it is able to detect the changes of pH. Generally, the fabrication technique can be classified into three types: electro-deposition iridium ox...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-03, Vol.328 (1), p.12014
Main Authors: Shahrestani, S, Ismail, M C, Kakooei, S, Beheshti, M, Zabihiazadboni, M, Zavareh, M A
Format: Article
Language:English
Subjects:
Buffer solutions
coating
cyclic voltammetry
Deposition
electro-deposition
Food processing
Iridium
iridium oxide
Metal plates
Metal surfaces
Nickel
Oxide coatings
pH sensor
Sensors
Stainless steel
Stainless steels
Steel wire
thick film
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Summary:A simple technique to fabricate the iridium oxide pH sensor is useful in several applications such as medical, food processing and engineering material where it is able to detect the changes of pH. Generally, the fabrication technique can be classified into three types: electro-deposition iridium oxide film (EIrOF), activated iridium oxide film (AIROF) and sputtering iridium oxide film (SIROF). This study focuses on fabricating electrode, calibration and test. Electro-deposition iridium oxide film is a simple and effective method of fabricating this kind of sensor via cyclic voltammetry process. The iridium oxide thick film was successfully electrodeposited on the surface of stainless steel wire with 500 cycles of sweep potential. A further analysis under FESEM shows detailed image of iridium oxide film which has cauliflower-liked microstructure. EDX analysis shows the highest element present are iridium and oxygen which concluded that the process is successful. The iridium oxide based pH sensor has shown a good performance in comparison to conventional glass pH sensor when it is being calibrated in buffer solutions with 2, 4, 7 and 9 pH values. The iridium oxide pH sensor is specifically designed to measure the pH on the surface of metal plate.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/328/1/012014