Optimization of Novel Anodes for Electrochemical Trace Oxygen Sensors

Measurement of trace-levels of dissolved oxygen (DO) is critical to manufacturing processes such as in semiconductor production. Electrochemical sensors are a mature technology for measuring DO, with the classic sensor pairing a silver (Ag) with a lead (Pb) anode. Emerging international regulations that ban the use of Pb due to environmental concerns threaten the continued commercial viability of these sensors. Past collaboration between the applicants identified a viable drop-in substitute for Pb, but subsequent quality-control testing identified two issues with the reformulated sensor that must be resolved prior to commercialization. Namely, sensor readings are systematically lower than those for the classic sensor, and the sensor readings invert when stored under low-O2 conditions for extended periods. This research will resolve these two issues through detailed analysis of the liquids and solids present in the reformulated sensor, enabling ICC to bring the reformulated cell to the market.

Faculty Supervisor:

Rodney Smith

Student:

Partner:

IC Controls Ltd.

Discipline:

Physics

Sector:

Manufacturing

University:

University of Waterloo

Program: