Patent ID: 8578758

Claim:
A gas sensor comprising: a gas-sensitive layer which changes in its characteristic properties upon contact with a detectable gas; and a sensitizer including a plurality of uniformly distributed discrete pieces in contact with the gas-sensitive layer; wherein said gas-sensitive layer has, as the main sensitive part, a polycrystalline layer composed of a plurality of uniform nano-size microcrystal particles which join together in a planar direction of the gas-sensitive layer, wherein the polycrystalline layer is a mono-layer which has only one microcrystal particle in a thickness direction of the gas-sensitive layer and a size of the sensitizer pieces is larger than the thickness of the polycrystalline layer, wherein the gas-sensitive layer is configured to sense the detectable gas at room temperature, and wherein the discrete pieces of the sensitizer are arranged in a lattice pattern with translational symmetry in the planar direction of the gas-sensitive layer.