Modified zinc oxide thick film resistors as NH3 gas sensor

Screen printed thick films of pure and RuO2-doped zinc oxide were prepared. Pure zinc oxide films were also surface modified with ruthenium chloride. Gas sensing properties of the pure, doped and surface modified films were studied. The films were observed to be most sensitive to NH3 gas. The results are discussed and interpreted. (c) 2005 Elsevier B.V. All rights reserved.