ABSTRACT
The progress in development of the zirconia-based gas sensors and new and improved traditional materials for SEs and REs have been discovered or invented during the last two decades at a faster rate than ever before. Indeed, both applied technology and the progress with which materials are changing are revolutionary rather than evolutionary. However, specifics of the gas sensor applications together with the dissimilar nature of joining sensor materials restricted the practical applicability of many interesting improvements [1]. In the early twenty-first century, the goal is still to develop sensors with better properties or new and unique combinations of properties, greater reliability combined with lower manufacturing and materials cost, and better environmental compatibility. In other words, the goal is still the same —
to enhance the sensors’ performance through greater structures and better processing!
