Patent ID: 8016988

Claim:
A gas sensor, comprising a post, comprising a first end, a second end, a side surface and a groove, wherein the groove is formed on the side surface of the post, and an opening is formed on the first end connecting with the groove; an ion conductive layer, formed on the side surface of the post, comprising a first surface and a second surface, wherein the first surface is opposite to the second surface, and the ion conductive layer and the groove compose a chamber; a first sensing portion, formed on the first surface; a second sensing portion, formed on the second surface in a position corresponding to the first sensing portion, wherein the first sensing portion is located in the chamber; a first connection portion; a first conductive portion; and a second connection portion and a second conductive portion; wherein the first conductive portion is electrically connected to the first sensing portion and the first connection portion, and the second conductive portion is electrically connected to the second sensing portion and the second connection portion; and wherein the first sensing portion comprises a first gas diffusion layer, and the second sensing portion comprises a second gas diffusion layer.