Safe membrane-releasing process for thermoelectric hydrogen gas sensor

We present here a safe membrane-releasing process in KOH for the fabrication of a high performance freestanding device and the mass production of a single membrane device for the hydrogen gas sensing application. The fabricated devices are thermoelectric hydrogen gas sensors based on the thermoelectric detection of the catalytic hydrogen combustion. The free-standing device has a voltage response 2.7 times higher than the single membrane device. The proposed membrane-releasing process, which combines black wax and a KOH protective polymer coat, shows fabrication yields of 31%, 50% for the free-standing device and 47% for the single-membrane device produced in mass.