Investigation of drift correction and lifetime extension strategies for electrochemical nitrite sensors
Buch in deiner Nähe kaufen
Beschreibung
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.
Autor*in
Amina Brahem
Themen in »Investigation of drift correction and lifetime extension strategies for electrochemical nitrite sensors«
Impedanzspektroskopie Elektrochemischer Sensor Alterung