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The sensing mechanism of metal insulator silicon-based field effect transistor devices (MISFET) for H2 and NH3 detection has been studied for Pt/SiO2 and Ir/SiO2 model sensors with in situ infrared spectroscopy and density functional theory calculations (DFT). The spectroscopy experiments showed reversible formation of isolated OH groups on the silica surface upon H2 or NH3 exposure. In addition,...
High-temperature metal-insulator-silicon-carbide (MISiC) sensors are currently under development for use as NH3 sensors in selective-catalytic-reduction (SCR) systems in diesel engines or non-SCR (NSCR) systems in boilers. The detection of NH3 by these sensors requires the presence of triple points where the gas, the metal, and the insulator meet. These triple points have traditionally been located...
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