Patent ID: 8551571

Claim:
A method for making a conductive polymer composite for sensing a sort of gas, the method including the steps of: forming a porous conductive layer of conductive powder on a substrate; applying a polymer solution to the porous conductive layer so that a portion of the polymer solution penetrates into the porous conductive layer and the remainder of polymer solution forms a film over the porous conductive layer, wherein the polymer solution includes solvent and gas responsive polymer dissolved in the solvent, wherein the gas responsive polymer can execute adsorption and desorption of the gas of interest; wherein the concentration of the gas responsive polymer in the polymer solution ranges from 0.5 wt % to 2 wt %; and removing the solvent from the polymer solution applied to the porous conductive layer so as to form, on the substrate, a polymer base that covers the porous conductive layer; wherein the step of forming the porous conductive layer on the substrate includes the steps of: applying a powder-containing mixture to the substrate, the powder-containing mixture includes a solvent and conductive powder dispersed uniformly in the solvent; and removing the solvent from the powder-containing mixture applied to the substrate so as to form the porous conductive layer on the substrate; wherein the concentration of the conductive powder in the powder-containing mixture ranges from 0.1 wt % to 2 wt %.