> Hello all, > > I'm currently working on a gas sensor using Au electrodes. The electrodes > has a 1 um gap with ~0.5 um thick of SiO2 layer underneath. Without adding > any semiconductor layers on top of the electrodes, I've got the R reading > changed relevant to the presence or absence of testing gases, methanol for > example. > > I don't know how this could happen.I wonder if anyone has the same > experience that can share your idea to me. Any responses would be greatly > appreciated. > > Terry Hi, how high is the potential at which You are measuring? if You exceed 1,5V You will get probably some current due to the oxidation/reduction of Your electrodes. Also check possible electrochemical reactions which You may provoke with this potential. Greets Jan