Abstract
The conductivity of sodium super ionic conductor (NASICON, Na1+xZr2SixP3-xO12, 0 < x < 3) materials was evaluated through alternating current impedance spectroscopy measurement, and NASICON-based amperometric sensors were developed using sodium nitrite and molybdenum oxide-doped NaNO2 electrode materials. These sensors were then used to measure NO2 concentration in the parts per billion level (125 to 1000 ppb) in an atmosphere containing 16 % oxygen. The current response signal was studied by varying the applied voltage from −150 to −400 mV for a range of MoO3 concentrations at 110, 130, 150, and 170 °C. It was found that the sensitivity, response time, and degree of linearity of the NO2 sensor signal were influenced by the applied voltage, working temperature, and level of MoO3 doping. On the basis of the results obtained, it is concluded that an applied voltage of −300 mV, temperature of 150 °C, and a 1 mol% MoO3-doped NaNO2 electrode represent the optimal test parameters for ppb-level NO2 detection.
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