Methanol sensor using shear horizontal surface acoustic wave devices for direct methanol fuel cell

In this paper, a shear horizontal surface acoustic (SHSAW) sensor is applied to a methanol sensor for a direct methanol fuel cell (DMFC). First, influence of bubble is experimentally and theoretically discussed. As the bubbles are generated at high temperature, to reduce the influence of bubble is important. For this purpose, a peristaltic pump is used. The responses with or without the pump are compared. The results indicate that the sensor responses become stable with the pump. Then resolutions of MeOH concentration are experimentally estimated. Moreover, the optimum sensor frequency is theoretically discussed.