Amina Brahem (2 results)

Taschenbuch. Condition: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Excessive nitrite in water poses serious health and environmental risks, requiring reliable long-term monitoring. Electrochemical sensors offer advantages due to their sensitivity, low cost, and ease of use; however, they suffer from aging, which affects accuracy over time. This thesis addresses this limitation by developing and optimizing a nitrite sensor based on screen-printed carbon electrodes modified with electrodeposited gold. The sensor achieved promising performance, including a 15-day shelf life. A multidisciplinary study investigated aging mechanisms using electrochemical techniques (voltammetry, impedance spectroscopy) and physical methods (Raman, FTIR, SEM). The double-layer capacitance (Cdl) was identified as the most aging-sensitive parameter. An accelerated aging protocol in contaminated solution was designed to simulate long-term behavior. A systematic methodology for lifetime estimation, drift correction, and life extension was proposed. Applying an anti-fouling polymer layer extended the shelf life to 18 days. A novel correction method ensured accuracy despite aging and was validated in tap and groundwater. The approach enables sensor optimization and reliability in environmental applications. 316 pp. Englisch.

Taschenbuch. Condition: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Excessive nitrite in water poses serious health and environmental risks, requiring reliable long-term monitoring. Electrochemical sensors offer advantages due to their sensitivity, low cost, and ease of use; however, they suffer from aging, which affects accuracy over time. This thesis addresses this limitation by developing and optimizing a nitrite sensor based on screen-printed carbon electrodes modified with electrodeposited gold. The sensor achieved promising performance, including a 15-day shelf life. A multidisciplinary study investigated aging mechanisms using electrochemical techniques (voltammetry, impedance spectroscopy) and physical methods (Raman, FTIR, SEM). The double-layer capacitance (Cdl) was identified as the most aging-sensitive parameter. An accelerated aging protocol in contaminated solution was designed to simulate long-term behavior. A systematic methodology for lifetime estimation, drift correction, and life extension was proposed. Applying an anti-fouling polymer layer extended the shelf life to 18 days. A novel correction method ensured accuracy despite aging and was validated in tap and groundwater. The approach enables sensor optimization and reliability in environmental applications.; Dissertationsschrift.