Polyaniline-Based Flexible Sensor for pH Monitoring in Oxidizing Environments

Polyaniline-Based Flexible Sensor for pH Monitoring in Oxidizing Environments

Measuring pH in oxidizing solutions is a crucial issue in areas such as aquaculture, water treatment, industrial chemistry, and environmental analysis. For this purpose, a low-cost potentiometric flexible sensor using a polymer film as a pH-sensitive material has been developed in this study. The se...

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Bibliographic Details
Published in:Chemosensors Vol. 12; no. 6; p. 97
Main Authors: Bignall, Liam, Magnenet, Claire, Ramsamy, Catheline, Lakard, Sophie, Vassal, Simon, Lakard, Boris
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-06-2024
MDPI
Subjects:
Analysis
Aquaculture
Aqueous solutions
Cetyltrimethylammonium bromide
Chemical detectors
Chemical Sciences
Cost analysis
electrochemistry
Electrodeposition
Electrodes
Environmental monitoring
Flexible components
flexible sensors
Hydrogen
Hydrogen-ion concentration
Materials
Optical properties
Oxidation
pH effects
pH sensors
polyaniline
Polyanilines
Polymer films
Polymerization
Polymers
Potassium
Sensors
Sodium
Standard deviation
Substrates
Sulfuric acid
Surfactants
Transistors
Water treatment
France
Germany
pH sensors
surfactants
flexible sensors
polyaniline
electrochemistry
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Description
Summary:Measuring pH in oxidizing solutions is a crucial issue in areas such as aquaculture, water treatment, industrial chemistry, and environmental analysis. For this purpose, a low-cost potentiometric flexible sensor using a polymer film as a pH-sensitive material has been developed in this study. The sensor consists in a polyaniline film electrodeposited from a sulfuric acid solution on a gold electrode previously deposited on a flexible polyimide substrate. The resulting polyaniline-based pH sensors showed an interesting performance detection in aqueous solution, leading to sensitive (73.4 mV per unit pH) and reproducible (standard deviation of 1.75) responses over the entire pH range from 3 to 8. On the contrary, they were inoperative in the presence of oxidizing hypochlorite ions. Thus, other polyaniline films were electrodeposited in the presence of cetyltrimethylammonium bromide or Tritonx100 surfactant in an attempt to improve the sensing performance of the pH sensors in oxidizing solutions. The pH sensors based on polyaniline and Tritonx100 surfactant were then found to be sensitive (62.3 mV per unit pH) and reproducible (standard deviation of 1.52) in aqueous solutions containing hypochlorite ions. All polyaniline films were also characterized by profilometry and electronic microscopy to correlate the physicochemical features with the performance of the sensors.
ISSN:2227-9040
2227-9040
DOI:10.3390/chemosensors12060097