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 do**. 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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**e, B., Jiang, D., Feng, T. et al. Performance study of amperometric sensor for detecting NO2 at ppb concentration level. Ionics 21, 2647–2654 (2015). https://doi.org/10.1007/s11581-015-1419-x
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DOI: https://doi.org/10.1007/s11581-015-1419-x