Patent ID: 8293556

Claim:
A micro gas sensor comprising: a micro heater formed by doping impurities into polysilicon vapor-deposited on a substrate on which a first insulating layer is formed, wherein the micro heater has a planar surface; a polysilicon membrane for decreasing a heat loss of the micro heater, wherein a region of the polysilicon non-doped with the impurities is defined as the membrane, and wherein the micro heater and the membrane are formed at the same level of height; a power electrode for supplying power and a temperature measurement electrode for measuring a temperature, positioned at both ends of the micro heater; a second insulating layer formed on the micro heater and between the power electrode and the temperature measurement electrode, wherein the second insulating layer has a planar surface in consistent with the planar surface of the micro heater; a sensing substance formed on the second insulating layer, for sensing a gas; and a sensing electrode for measuring a change in properties of the sensing substance.