“…The design of the present device (31) may be viewed as a logical progression from the Pd MOSFET discussed above, although its mode of operation is substantially different. It is an advance over the porous Pd gate (8,32), the cantilevered gate (33), and the Pd MOSFET with deliberately etched holes (34)(35)(36). Conducting polymers such as polypyrrole, which has been found to be sensitive to NH3 (37), have been electrochemically deposited on the suspended gate (16,17).…”