Abstract
The design of electrochemical [amperometric] gas sensors [the AGS] involves consideration of materials, geometry, structure and methods of operation as well as supporting electronics; in other words it is a systems problem to make a practical sensors within size and cost constraints that will meet all performance requirements for a given market. This work examines the construction of an AGS for atmospheric pollutants [Ozone, CO, NO2] that combines microfluidic sample inlet with cell designed to operate over a wide range of RH, Pressure, and Temperature encountered in smart cities, IoT deployment. Not only is ppb sensitivity required, but also multiyear stability of both span and background currents as well as a MTBF [mean time between failure] measured in decades. The approach to design, fabrication, testing, and deployment as well as field data are presented. Overall assessment of the advantages of electrochemistry as well as limitations and challenges are discussed. to be entered later
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