Resistance based of Gas Sensing

            In the section the discussion is about the Semiconducting of the metal oxides, and since in 1950,the electrical properties of the metal oxides which vary when exposed to reducing the gases. Meanwhile the metal oxide film is applied on a material of the insulation substrate samong the two electrodes. On the thick film of substrates the oxide can be deposited by the screen printing where its process is followed through the heat treatment form as intering of the thin film.

Work function based of Gas Sensing

            The work function based is the sensors which has generally the triple layer of metal along with the structure of the semiconductor. And it is normally measured in the electron volts along with the minimum energy which is required to remove the electron form the solid surface to the infinity. In this the purpose of the hydrogen detection is the sensitive catalyticmetal which is deposited the layers of oxides that turns into the deposited of the substrates of semiconductor. The device which is measured the variation in themetal work function it can also measure the concentration of hydrogen.