Comprehensive analytical modelling of an absolute pH sensor

Medina-Bailon, C., Kumar, N. , Dhar, R. P. S., Todorova, I., Lenoble, D., Georgiev, V. P. and Pascual García, C. (2021) Comprehensive analytical modelling of an absolute pH sensor. Sensors, 21(15), 5190. (doi: 10.3390/s21155190)

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In this work, we present a comprehensive analytical model and results for an absolute pH sensor. Our work aims to address critical scientific issues such as: (1) the impact of the oxide degradation (sensing interface deterioration) on the sensor’s performance and (2) how to achieve a measurement of the absolute ion activity. The methods described here are based on analytical equations which we have derived and implemented in MATLAB code to execute the numerical experiments. The main results of our work show that the depletion width of the sensors is strongly influenced by the pH and the variations of the same depletion width as a function of the pH is significantly smaller for hafnium dioxide in comparison to silicon dioxide. We propose a method to determine the absolute pH using a dual capacitance system, which can be mapped to unequivocally determine the acidity. We compare the impact of degradation in two materials: SiO2 and HfO2, and we illustrate the acidity determination with the functioning of a dual device with SiO2.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Dhar, Ms Rakshita Pritam and Kumar, Dr Naveen and Todorova, Miss Ilina and Georgiev, Professor Vihar and Medina Bailon, Miss Cristina
Creator Roles:
Medina Bailon, C.Conceptualization, Methodology, Formal analysis, Visualization, Supervision
Kumar, N.Methodology, Software, Formal analysis, Visualization
Dhar, R. P. S.Validation, Visualization
Todorova, I.Validation
Georgiev, V. P.Methodology, Formal analysis, Supervision
Authors: Medina-Bailon, C., Kumar, N., Dhar, R. P. S., Todorova, I., Lenoble, D., Georgiev, V. P., and Pascual García, C.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Sensors
ISSN (Online):1424-8220
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Sensors 21(15):5190
Publisher Policy:Reproduced under a Creative Commons licence

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
305900Electrochemically-enabled high-throughput peptidomics for next-generation precision medicineVihar GeorgievEuropean Commission (EC)862539ENG - Electronics & Nanoscale Engineering