具有釤鈦氧化物之離子場效電晶體及其離子感測電極

This invention discloses an ion sensitive field effect transistor which is doped with samarium-titanium oxide compound. The ion sensitive field effect transistor comprises a semi-conductor layer, and a sensing layer and a conducting layer which are respectively setup on two opposite sides of the semi-conductor layer. Particularly, the sensing layer comprises a material formed by samarium-titanium oxide compound which generates a corresponding electric potential according to a pH value when contact is made with a sample material. The electric potential is output through the conducting layer which is electrically connected to the sensing layer; hence, a pH value change of the sample material can be precisely measured. This invention also discloses an ion sensing electrode having the ion sensitive field effect transistor doped with samarium-titanium oxide compound.