Laminated gas sensor element, gas sensor equipped with laminated gas sensor element, and method for manufacturing laminated gas sensor element

摘要

A laminated gas sensor element including a detection element including a solid electrolyte body having a pair of electrodes formed thereon laminated together with a heater element. A porous protection layer is formed on at least a distal end portion of the laminated gas sensor element which is to be exposed to a gas to be measured. The surface of the porous protection layer has 10 or more small pores each having a diameter of 1 μm to 5 μm inclusive and an aspect ratio of 0.5 to 2.0 inclusive within an area measuring 50 μm×50 μm, and one to less than 20 large pores each having a diameter of 8 μm to 20 μm inclusive and an aspect ratio of 0.5 to 2.0 inclusive within an area measuring 100 μm×100 μm. Also disclosed is a method for manufacturing the laminated gas sensor.