Low-temperature Deposited Highly Sensitive Integrated All-Solid Electrodes for Electrochemical pH Detection

• Published in: Pertanika Journal of Science and Technology
• Main Author: Mahzan N.H.; Hashim S.B.; Alip R.I.; Khan Z.I.; Herman S.H.
• Format: Article
• Language: English
• Published: Universiti Putra Malaysia Press 2024
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85208441785&doi=10.47836%2fpjst.32.6.08&partnerID=40&md5=8fcf1fefcbb7ef9049fd339e965bbb99

This article describes the process of fabricating an integrated all-solid electrode (IASE) by integrating thin films of titanium dioxide (TiO2) and silver/silver chloride (Ag/AgCl) onto an indium tin oxide (ITO) substrate. The fabrication of a pH sensing electrode (SE) involved utilizing a spin-coated thin film composed of TiO2. Thermally produced thin films of Ag/AgCl were used to develop solid reference electrodes (RE). The present work examined the impact of the drying process on the pH sensitivity and linearity of the low-temperature deposited IASE. The drying procedure was carried out within a temperature range from room temperature to 100°C. The investigation involved the examination of crystallinity, surface morphology, and thin film composition through the utilization of field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD), and energy-dispersive X-ray (EDX) methods. In addition, a comparison was made between the pH sensing performance of the IASE and a commercially available Ag/AgCl RE. The findings of this research demonstrate that the IASE sample, which underwent a drying process at a temperature of 100°C, exhibited remarkable sensitivity and linearity values of 66.7 mV/pH and 0.9827, separately, when compared to the commercially available RE. © Universiti Putra Malaysia Press.